From 9dbb2bfd73e66106ec75fb9fff3ac38d85e40395 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@gmail.com>
Date: Sat, 5 Dec 2020 11:40:00 +0100
Subject: Wrap SortedSet with `ruby_version_is ""..."3.0"`

* Using $ spec/mspec/tool/wrap_with_guard.rb 'ruby_version_is ""..."3.0"' spec/ruby/library/set/sortedset/**/*_spec.rb
---
 spec/ruby/library/set/sortedset/add_spec.rb        | 59 ++++++++++---------
 spec/ruby/library/set/sortedset/append_spec.rb     | 11 ++--
 .../library/set/sortedset/case_equality_spec.rb    | 11 ++--
 spec/ruby/library/set/sortedset/classify_spec.rb   | 41 +++++++------
 spec/ruby/library/set/sortedset/clear_spec.rb      | 25 ++++----
 spec/ruby/library/set/sortedset/collect_spec.rb    | 11 ++--
 .../ruby/library/set/sortedset/constructor_spec.rb | 21 ++++---
 spec/ruby/library/set/sortedset/delete_if_spec.rb  | 57 +++++++++---------
 spec/ruby/library/set/sortedset/delete_spec.rb     | 55 +++++++++---------
 spec/ruby/library/set/sortedset/difference_spec.rb | 11 ++--
 spec/ruby/library/set/sortedset/divide_spec.rb     | 53 +++++++++--------
 spec/ruby/library/set/sortedset/each_spec.rb       | 39 +++++++------
 spec/ruby/library/set/sortedset/empty_spec.rb      | 15 +++--
 spec/ruby/library/set/sortedset/eql_spec.rb        | 23 ++++----
 .../ruby/library/set/sortedset/equal_value_spec.rb | 19 +++---
 spec/ruby/library/set/sortedset/exclusion_spec.rb  | 27 +++++----
 spec/ruby/library/set/sortedset/filter_spec.rb     | 13 +++--
 .../library/set/sortedset/flatten_merge_spec.rb    | 11 ++--
 spec/ruby/library/set/sortedset/flatten_spec.rb    | 67 +++++++++++-----------
 spec/ruby/library/set/sortedset/hash_spec.rb       | 19 +++---
 spec/ruby/library/set/sortedset/include_spec.rb    | 11 ++--
 spec/ruby/library/set/sortedset/initialize_spec.rb | 49 ++++++++--------
 spec/ruby/library/set/sortedset/inspect_spec.rb    | 15 +++--
 .../library/set/sortedset/intersection_spec.rb     | 17 +++---
 spec/ruby/library/set/sortedset/keep_if_spec.rb    | 47 ++++++++-------
 spec/ruby/library/set/sortedset/length_spec.rb     | 11 ++--
 spec/ruby/library/set/sortedset/map_spec.rb        | 11 ++--
 spec/ruby/library/set/sortedset/member_spec.rb     | 11 ++--
 spec/ruby/library/set/sortedset/merge_spec.rb      | 29 +++++-----
 spec/ruby/library/set/sortedset/minus_spec.rb      | 11 ++--
 spec/ruby/library/set/sortedset/plus_spec.rb       | 11 ++--
 .../set/sortedset/pretty_print_cycle_spec.rb       | 15 +++--
 .../library/set/sortedset/pretty_print_spec.rb     | 23 ++++----
 .../library/set/sortedset/proper_subset_spec.rb    | 51 ++++++++--------
 .../library/set/sortedset/proper_superset_spec.rb  | 51 ++++++++--------
 spec/ruby/library/set/sortedset/reject_spec.rb     | 63 ++++++++++----------
 spec/ruby/library/set/sortedset/replace_spec.rb    | 25 ++++----
 spec/ruby/library/set/sortedset/select_spec.rb     | 11 ++--
 spec/ruby/library/set/sortedset/size_spec.rb       | 11 ++--
 spec/ruby/library/set/sortedset/subset_spec.rb     | 51 ++++++++--------
 spec/ruby/library/set/sortedset/subtract_spec.rb   | 25 ++++----
 spec/ruby/library/set/sortedset/superset_spec.rb   | 51 ++++++++--------
 spec/ruby/library/set/sortedset/to_a_spec.rb       | 25 ++++----
 spec/ruby/library/set/sortedset/union_spec.rb      | 17 +++---
 44 files changed, 681 insertions(+), 549 deletions(-)

(limited to 'spec/ruby/library')

diff --git a/spec/ruby/library/set/sortedset/add_spec.rb b/spec/ruby/library/set/sortedset/add_spec.rb
index 5f8bde02f5..4f3bb252e1 100644
--- a/spec/ruby/library/set/sortedset/add_spec.rb
+++ b/spec/ruby/library/set/sortedset/add_spec.rb
@@ -1,39 +1,42 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/add'
 
-describe "SortedSet#add" do
-  it_behaves_like :sorted_set_add, :add
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/add'
 
-  it "takes only values which responds <=>" do
-    obj = mock('no_comparison_operator')
-    obj.stub!(:respond_to?).with(:<=>).and_return(false)
-    -> { SortedSet["hello"].add(obj) }.should raise_error(ArgumentError)
-  end
+  describe "SortedSet#add" do
+    it_behaves_like :sorted_set_add, :add
 
-  it "raises on incompatible <=> comparison" do
-    # Use #to_a here as elements are sorted only when needed.
-    # Therefore the <=> incompatibility is only noticed on sorting.
-    -> { SortedSet['1', '2'].add(3).to_a }.should raise_error(ArgumentError)
-  end
-end
+    it "takes only values which responds <=>" do
+      obj = mock('no_comparison_operator')
+      obj.stub!(:respond_to?).with(:<=>).and_return(false)
+      -> { SortedSet["hello"].add(obj) }.should raise_error(ArgumentError)
+    end
 
-describe "SortedSet#add?" do
-  before :each do
-    @set = SortedSet.new
+    it "raises on incompatible <=> comparison" do
+      # Use #to_a here as elements are sorted only when needed.
+      # Therefore the <=> incompatibility is only noticed on sorting.
+      -> { SortedSet['1', '2'].add(3).to_a }.should raise_error(ArgumentError)
+    end
   end
 
-  it "adds the passed Object to self" do
-    @set.add?("cat")
-    @set.should include("cat")
-  end
+  describe "SortedSet#add?" do
+    before :each do
+      @set = SortedSet.new
+    end
 
-  it "returns self when the Object has not yet been added to self" do
-    @set.add?("cat").should equal(@set)
-  end
+    it "adds the passed Object to self" do
+      @set.add?("cat")
+      @set.should include("cat")
+    end
+
+    it "returns self when the Object has not yet been added to self" do
+      @set.add?("cat").should equal(@set)
+    end
 
-  it "returns nil when the Object has already been added to self" do
-    @set.add?("cat")
-    @set.add?("cat").should be_nil
+    it "returns nil when the Object has already been added to self" do
+      @set.add?("cat")
+      @set.add?("cat").should be_nil
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/append_spec.rb b/spec/ruby/library/set/sortedset/append_spec.rb
index ebcceba962..d72d70b21f 100644
--- a/spec/ruby/library/set/sortedset/append_spec.rb
+++ b/spec/ruby/library/set/sortedset/append_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/add'
 
-describe "SortedSet#<<" do
-  it_behaves_like :sorted_set_add, :<<
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/add'
+
+  describe "SortedSet#<<" do
+    it_behaves_like :sorted_set_add, :<<
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/case_equality_spec.rb b/spec/ruby/library/set/sortedset/case_equality_spec.rb
index 48e3735c8e..d7c296b626 100644
--- a/spec/ruby/library/set/sortedset/case_equality_spec.rb
+++ b/spec/ruby/library/set/sortedset/case_equality_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/include'
-require 'set'
 
-describe "SortedSet#===" do
-  it_behaves_like :sorted_set_include, :===
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/include'
+  require 'set'
+
+  describe "SortedSet#===" do
+    it_behaves_like :sorted_set_include, :===
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/classify_spec.rb b/spec/ruby/library/set/sortedset/classify_spec.rb
index 62b26d5d28..4011e58b82 100644
--- a/spec/ruby/library/set/sortedset/classify_spec.rb
+++ b/spec/ruby/library/set/sortedset/classify_spec.rb
@@ -1,27 +1,30 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#classify" do
-  before :each do
-    @set = SortedSet["one", "two", "three", "four"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    res = []
-    @set.classify { |x| res << x }
-    res.should == ["one", "two", "three", "four"].sort
-  end
+  describe "SortedSet#classify" do
+    before :each do
+      @set = SortedSet["one", "two", "three", "four"]
+    end
 
-  it "returns an Enumerator when passed no block" do
-    enum = @set.classify
-    enum.should be_an_instance_of(Enumerator)
+    it "yields each Object in self in sorted order" do
+      res = []
+      @set.classify { |x| res << x }
+      res.should == ["one", "two", "three", "four"].sort
+    end
 
-    classified = enum.each { |x| x.length }
-    classified.should == { 3 => SortedSet["one", "two"], 4 => SortedSet["four"], 5 => SortedSet["three"] }
-  end
+    it "returns an Enumerator when passed no block" do
+      enum = @set.classify
+      enum.should be_an_instance_of(Enumerator)
+
+      classified = enum.each { |x| x.length }
+      classified.should == { 3 => SortedSet["one", "two"], 4 => SortedSet["four"], 5 => SortedSet["three"] }
+    end
 
-  it "classifies the Objects in self based on the block's return value" do
-    classified = @set.classify { |x| x.length }
-    classified.should == { 3 => SortedSet["one", "two"], 4 => SortedSet["four"], 5 => SortedSet["three"] }
+    it "classifies the Objects in self based on the block's return value" do
+      classified = @set.classify { |x| x.length }
+      classified.should == { 3 => SortedSet["one", "two"], 4 => SortedSet["four"], 5 => SortedSet["three"] }
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/clear_spec.rb b/spec/ruby/library/set/sortedset/clear_spec.rb
index 11b5db2095..879aa824d8 100644
--- a/spec/ruby/library/set/sortedset/clear_spec.rb
+++ b/spec/ruby/library/set/sortedset/clear_spec.rb
@@ -1,17 +1,20 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#clear" do
-  before :each do
-    @set = SortedSet["one", "two", "three", "four"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "removes all elements from self" do
-    @set.clear
-    @set.should be_empty
-  end
+  describe "SortedSet#clear" do
+    before :each do
+      @set = SortedSet["one", "two", "three", "four"]
+    end
+
+    it "removes all elements from self" do
+      @set.clear
+      @set.should be_empty
+    end
 
-  it "returns self" do
-    @set.clear.should equal(@set)
+    it "returns self" do
+      @set.clear.should equal(@set)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/collect_spec.rb b/spec/ruby/library/set/sortedset/collect_spec.rb
index 21ead4fe55..0674f0d130 100644
--- a/spec/ruby/library/set/sortedset/collect_spec.rb
+++ b/spec/ruby/library/set/sortedset/collect_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/collect'
 
-describe "SortedSet#collect!" do
-  it_behaves_like :sorted_set_collect_bang, :collect!
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/collect'
+
+  describe "SortedSet#collect!" do
+    it_behaves_like :sorted_set_collect_bang, :collect!
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/constructor_spec.rb b/spec/ruby/library/set/sortedset/constructor_spec.rb
index 953144dbdb..31f30fd892 100644
--- a/spec/ruby/library/set/sortedset/constructor_spec.rb
+++ b/spec/ruby/library/set/sortedset/constructor_spec.rb
@@ -1,15 +1,18 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet[]" do
-  it "returns a new SortedSet populated with the passed Objects" do
-    set = SortedSet[1, 2, 3]
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-    set.instance_of?(SortedSet).should be_true
-    set.size.should eql(3)
+  describe "SortedSet[]" do
+    it "returns a new SortedSet populated with the passed Objects" do
+      set = SortedSet[1, 2, 3]
 
-    set.should include(1)
-    set.should include(2)
-    set.should include(3)
+      set.instance_of?(SortedSet).should be_true
+      set.size.should eql(3)
+
+      set.should include(1)
+      set.should include(2)
+      set.should include(3)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/delete_if_spec.rb b/spec/ruby/library/set/sortedset/delete_if_spec.rb
index 1ff689376a..787639ae12 100644
--- a/spec/ruby/library/set/sortedset/delete_if_spec.rb
+++ b/spec/ruby/library/set/sortedset/delete_if_spec.rb
@@ -1,38 +1,41 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#delete_if" do
-  before :each do
-    @set = SortedSet["one", "two", "three"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    ret = []
-    @set.delete_if { |x| ret << x }
-    ret.should == ["one", "two", "three"].sort
-  end
+  describe "SortedSet#delete_if" do
+    before :each do
+      @set = SortedSet["one", "two", "three"]
+    end
 
-  it "deletes every element from self for which the passed block returns true" do
-    @set.delete_if { |x| x.size == 3 }
-    @set.size.should eql(1)
+    it "yields each Object in self in sorted order" do
+      ret = []
+      @set.delete_if { |x| ret << x }
+      ret.should == ["one", "two", "three"].sort
+    end
 
-    @set.should_not include("one")
-    @set.should_not include("two")
-    @set.should include("three")
-  end
+    it "deletes every element from self for which the passed block returns true" do
+      @set.delete_if { |x| x.size == 3 }
+      @set.size.should eql(1)
 
-  it "returns self" do
-    @set.delete_if { |x| x }.should equal(@set)
-  end
+      @set.should_not include("one")
+      @set.should_not include("two")
+      @set.should include("three")
+    end
+
+    it "returns self" do
+      @set.delete_if { |x| x }.should equal(@set)
+    end
 
-  it "returns an Enumerator when passed no block" do
-    enum = @set.delete_if
-    enum.should be_an_instance_of(Enumerator)
+    it "returns an Enumerator when passed no block" do
+      enum = @set.delete_if
+      enum.should be_an_instance_of(Enumerator)
 
-    enum.each { |x| x.size == 3 }
+      enum.each { |x| x.size == 3 }
 
-    @set.should_not include("one")
-    @set.should_not include("two")
-    @set.should include("three")
+      @set.should_not include("one")
+      @set.should_not include("two")
+      @set.should include("three")
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/delete_spec.rb b/spec/ruby/library/set/sortedset/delete_spec.rb
index 71583c7f13..0e2a6accf3 100644
--- a/spec/ruby/library/set/sortedset/delete_spec.rb
+++ b/spec/ruby/library/set/sortedset/delete_spec.rb
@@ -1,37 +1,40 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#delete" do
-  before :each do
-    @set = SortedSet["a", "b", "c"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "deletes the passed Object from self" do
-    @set.delete("a")
-    @set.should_not include("a")
-  end
+  describe "SortedSet#delete" do
+    before :each do
+      @set = SortedSet["a", "b", "c"]
+    end
 
-  it "returns self" do
-    @set.delete("a").should equal(@set)
-    @set.delete("x").should equal(@set)
-  end
-end
+    it "deletes the passed Object from self" do
+      @set.delete("a")
+      @set.should_not include("a")
+    end
 
-describe "SortedSet#delete?" do
-  before :each do
-    @set = SortedSet["a", "b", "c"]
+    it "returns self" do
+      @set.delete("a").should equal(@set)
+      @set.delete("x").should equal(@set)
+    end
   end
 
-  it "deletes the passed Object from self" do
-    @set.delete?("a")
-    @set.should_not include("a")
-  end
+  describe "SortedSet#delete?" do
+    before :each do
+      @set = SortedSet["a", "b", "c"]
+    end
 
-  it "returns self when the passed Object is in self" do
-    @set.delete?("a").should equal(@set)
-  end
+    it "deletes the passed Object from self" do
+      @set.delete?("a")
+      @set.should_not include("a")
+    end
+
+    it "returns self when the passed Object is in self" do
+      @set.delete?("a").should equal(@set)
+    end
 
-  it "returns nil when the passed Object is not in self" do
-    @set.delete?("x").should be_nil
+    it "returns nil when the passed Object is not in self" do
+      @set.delete?("x").should be_nil
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/difference_spec.rb b/spec/ruby/library/set/sortedset/difference_spec.rb
index c3d679aff8..fb064bdff9 100644
--- a/spec/ruby/library/set/sortedset/difference_spec.rb
+++ b/spec/ruby/library/set/sortedset/difference_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/difference'
 
-describe "SortedSet#difference" do
-  it_behaves_like :sorted_set_difference, :difference
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/difference'
+
+  describe "SortedSet#difference" do
+    it_behaves_like :sorted_set_difference, :difference
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/divide_spec.rb b/spec/ruby/library/set/sortedset/divide_spec.rb
index 4b2135a8c9..31ab6037e4 100644
--- a/spec/ruby/library/set/sortedset/divide_spec.rb
+++ b/spec/ruby/library/set/sortedset/divide_spec.rb
@@ -1,34 +1,37 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#divide" do
-  it "divides self into a set of subsets based on the blocks return values" do
-    set = SortedSet["one", "two", "three", "four", "five"].divide { |x| x.length }
-    set.map { |x| x.to_a }.to_a.sort.should == [["five", "four"], ["one", "two"], ["three"]]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    ret = []
-    SortedSet["one", "two", "three", "four", "five"].divide { |x| ret << x }
-    ret.should == ["one", "two", "three", "four", "five"].sort
-  end
+  describe "SortedSet#divide" do
+    it "divides self into a set of subsets based on the blocks return values" do
+      set = SortedSet["one", "two", "three", "four", "five"].divide { |x| x.length }
+      set.map { |x| x.to_a }.to_a.sort.should == [["five", "four"], ["one", "two"], ["three"]]
+    end
 
-  # BUG: Does not raise a LocalJumpError, but a NoMethodError
-  #
-  # it "raises a LocalJumpError when not passed a block" do
-  #   lambda { SortedSet[1].divide }.should raise_error(LocalJumpError)
-  # end
-end
+    it "yields each Object in self in sorted order" do
+      ret = []
+      SortedSet["one", "two", "three", "four", "five"].divide { |x| ret << x }
+      ret.should == ["one", "two", "three", "four", "five"].sort
+    end
 
-describe "SortedSet#divide when passed a block with an arity of 2" do
-  it "divides self into a set of subsets based on the blocks return values" do
-    set = SortedSet[1, 3, 4, 6, 9, 10, 11].divide { |x, y| (x - y).abs == 1 }
-    set.map { |x| x.to_a }.to_a.sort.should == [[1], [3, 4], [6], [9, 10, 11]]
+    # BUG: Does not raise a LocalJumpError, but a NoMethodError
+    #
+    # it "raises a LocalJumpError when not passed a block" do
+    #   lambda { SortedSet[1].divide }.should raise_error(LocalJumpError)
+    # end
   end
 
-  it "yields each two Objects to the block" do
-    ret = []
-    SortedSet[1, 2].divide { |x, y| ret << [x, y] }
-    ret.should == [[1, 1], [1, 2], [2, 1], [2, 2]]
+  describe "SortedSet#divide when passed a block with an arity of 2" do
+    it "divides self into a set of subsets based on the blocks return values" do
+      set = SortedSet[1, 3, 4, 6, 9, 10, 11].divide { |x, y| (x - y).abs == 1 }
+      set.map { |x| x.to_a }.to_a.sort.should == [[1], [3, 4], [6], [9, 10, 11]]
+    end
+
+    it "yields each two Objects to the block" do
+      ret = []
+      SortedSet[1, 2].divide { |x, y| ret << [x, y] }
+      ret.should == [[1, 1], [1, 2], [2, 1], [2, 2]]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/each_spec.rb b/spec/ruby/library/set/sortedset/each_spec.rb
index bcf0d74d1f..79d8aee223 100644
--- a/spec/ruby/library/set/sortedset/each_spec.rb
+++ b/spec/ruby/library/set/sortedset/each_spec.rb
@@ -1,26 +1,29 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#each" do
-  before :each do
-    @set = SortedSet[1, 2, 3]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    ret = []
-    SortedSet["one", "two", "three"].each { |x| ret << x }
-    ret.should == ["one", "two", "three"].sort
-  end
+  describe "SortedSet#each" do
+    before :each do
+      @set = SortedSet[1, 2, 3]
+    end
 
-  it "returns self" do
-    @set.each { |x| x }.should equal(@set)
-  end
+    it "yields each Object in self in sorted order" do
+      ret = []
+      SortedSet["one", "two", "three"].each { |x| ret << x }
+      ret.should == ["one", "two", "three"].sort
+    end
+
+    it "returns self" do
+      @set.each { |x| x }.should equal(@set)
+    end
 
-  it "returns an Enumerator when not passed a block" do
-    enum = @set.each
+    it "returns an Enumerator when not passed a block" do
+      enum = @set.each
 
-    ret = []
-    enum.each { |x| ret << x }
-    ret.sort.should == [1, 2, 3]
+      ret = []
+      enum.each { |x| ret << x }
+      ret.sort.should == [1, 2, 3]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/empty_spec.rb b/spec/ruby/library/set/sortedset/empty_spec.rb
index deb3b567fb..2e52c3e81a 100644
--- a/spec/ruby/library/set/sortedset/empty_spec.rb
+++ b/spec/ruby/library/set/sortedset/empty_spec.rb
@@ -1,10 +1,13 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#empty?" do
-  it "returns true if self is empty" do
-    SortedSet[].empty?.should be_true
-    SortedSet[1].empty?.should be_false
-    SortedSet[1,2,3].empty?.should be_false
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  describe "SortedSet#empty?" do
+    it "returns true if self is empty" do
+      SortedSet[].empty?.should be_true
+      SortedSet[1].empty?.should be_false
+      SortedSet[1,2,3].empty?.should be_false
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/eql_spec.rb b/spec/ruby/library/set/sortedset/eql_spec.rb
index b22858a362..050464994b 100644
--- a/spec/ruby/library/set/sortedset/eql_spec.rb
+++ b/spec/ruby/library/set/sortedset/eql_spec.rb
@@ -1,16 +1,19 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#eql?" do
-  it "returns true when the passed argument is a SortedSet and contains the same elements" do
-    SortedSet[].should eql(SortedSet[])
-    SortedSet[1, 2, 3].should eql(SortedSet[1, 2, 3])
-    SortedSet[1, 2, 3].should eql(SortedSet[3, 2, 1])
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-#    SortedSet["a", :b, ?c].should eql(SortedSet[?c, :b, "a"])
+  describe "SortedSet#eql?" do
+    it "returns true when the passed argument is a SortedSet and contains the same elements" do
+      SortedSet[].should eql(SortedSet[])
+      SortedSet[1, 2, 3].should eql(SortedSet[1, 2, 3])
+      SortedSet[1, 2, 3].should eql(SortedSet[3, 2, 1])
 
-    SortedSet[1, 2, 3].should_not eql(SortedSet[1.0, 2, 3])
-    SortedSet[1, 2, 3].should_not eql(SortedSet[2, 3])
-    SortedSet[1, 2, 3].should_not eql(SortedSet[])
+  #    SortedSet["a", :b, ?c].should eql(SortedSet[?c, :b, "a"])
+
+      SortedSet[1, 2, 3].should_not eql(SortedSet[1.0, 2, 3])
+      SortedSet[1, 2, 3].should_not eql(SortedSet[2, 3])
+      SortedSet[1, 2, 3].should_not eql(SortedSet[])
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/equal_value_spec.rb b/spec/ruby/library/set/sortedset/equal_value_spec.rb
index cb1b7c9443..30422f5b95 100644
--- a/spec/ruby/library/set/sortedset/equal_value_spec.rb
+++ b/spec/ruby/library/set/sortedset/equal_value_spec.rb
@@ -1,13 +1,16 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#==" do
-  it "returns true when the passed Object is a SortedSet and self and the Object contain the same elements" do
-    SortedSet[].should == SortedSet[]
-    SortedSet[1, 2, 3].should == SortedSet[1, 2, 3]
-    SortedSet["1", "2", "3"].should == SortedSet["1", "2", "3"]
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-    SortedSet[1, 2, 3].should_not == SortedSet[1.0, 2, 3]
-    SortedSet[1, 2, 3].should_not == [1, 2, 3]
+  describe "SortedSet#==" do
+    it "returns true when the passed Object is a SortedSet and self and the Object contain the same elements" do
+      SortedSet[].should == SortedSet[]
+      SortedSet[1, 2, 3].should == SortedSet[1, 2, 3]
+      SortedSet["1", "2", "3"].should == SortedSet["1", "2", "3"]
+
+      SortedSet[1, 2, 3].should_not == SortedSet[1.0, 2, 3]
+      SortedSet[1, 2, 3].should_not == [1, 2, 3]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/exclusion_spec.rb b/spec/ruby/library/set/sortedset/exclusion_spec.rb
index d0f1ab95cb..1967dfbfa6 100644
--- a/spec/ruby/library/set/sortedset/exclusion_spec.rb
+++ b/spec/ruby/library/set/sortedset/exclusion_spec.rb
@@ -1,18 +1,21 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#^" do
-  before :each do
-    @set = SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns a new SortedSet containing elements that are not in both self and the passed Enumerable" do
-    (@set ^ SortedSet[3, 4, 5]).should == SortedSet[1, 2, 5]
-    (@set ^ [3, 4, 5]).should == SortedSet[1, 2, 5]
-  end
+  describe "SortedSet#^" do
+    before :each do
+      @set = SortedSet[1, 2, 3, 4]
+    end
+
+    it "returns a new SortedSet containing elements that are not in both self and the passed Enumerable" do
+      (@set ^ SortedSet[3, 4, 5]).should == SortedSet[1, 2, 5]
+      (@set ^ [3, 4, 5]).should == SortedSet[1, 2, 5]
+    end
 
-  it "raises an ArgumentError when passed a non-Enumerable" do
-    -> { @set ^ 3 }.should raise_error(ArgumentError)
-    -> { @set ^ Object.new }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-Enumerable" do
+      -> { @set ^ 3 }.should raise_error(ArgumentError)
+      -> { @set ^ Object.new }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/filter_spec.rb b/spec/ruby/library/set/sortedset/filter_spec.rb
index cfaa8b2729..c6d881de67 100644
--- a/spec/ruby/library/set/sortedset/filter_spec.rb
+++ b/spec/ruby/library/set/sortedset/filter_spec.rb
@@ -1,9 +1,12 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/select'
-require 'set'
 
-ruby_version_is "2.6" do
-  describe "SortedSet#filter!" do
-    it_behaves_like :sorted_set_select_bang, :filter!
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/select'
+  require 'set'
+
+  ruby_version_is "2.6" do
+    describe "SortedSet#filter!" do
+      it_behaves_like :sorted_set_select_bang, :filter!
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/flatten_merge_spec.rb b/spec/ruby/library/set/sortedset/flatten_merge_spec.rb
index 9a8ed13f00..0d67cb331e 100644
--- a/spec/ruby/library/set/sortedset/flatten_merge_spec.rb
+++ b/spec/ruby/library/set/sortedset/flatten_merge_spec.rb
@@ -1,8 +1,11 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#flatten_merge" do
-  it "is protected" do
-    SortedSet.should have_protected_instance_method("flatten_merge")
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  describe "SortedSet#flatten_merge" do
+    it "is protected" do
+      SortedSet.should have_protected_instance_method("flatten_merge")
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/flatten_spec.rb b/spec/ruby/library/set/sortedset/flatten_spec.rb
index ca4e4637e6..e83ad1044a 100644
--- a/spec/ruby/library/set/sortedset/flatten_spec.rb
+++ b/spec/ruby/library/set/sortedset/flatten_spec.rb
@@ -1,44 +1,47 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-# Note: Flatten make little sens on sorted sets, because SortedSets are not (by default)
-# comparable. For a SortedSet to be both valid and nested, we need to define a comparison operator:
-module SortedSet_FlattenSpecs
-  class ComparableSortedSet < SortedSet
-    def <=>(other)
-      return puts "#{other} vs #{self}" unless other.is_a?(ComparableSortedSet)
-      to_a <=> other.to_a
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  # Note: Flatten make little sens on sorted sets, because SortedSets are not (by default)
+  # comparable. For a SortedSet to be both valid and nested, we need to define a comparison operator:
+  module SortedSet_FlattenSpecs
+    class ComparableSortedSet < SortedSet
+      def <=>(other)
+        return puts "#{other} vs #{self}" unless other.is_a?(ComparableSortedSet)
+        to_a <=> other.to_a
+      end
     end
   end
-end
 
-describe "SortedSet#flatten" do
-  it "returns a copy of self with each included SortedSet flattened" do
-    klass = SortedSet_FlattenSpecs::ComparableSortedSet
-    set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
-    flattened_set = set.flatten
+  describe "SortedSet#flatten" do
+    it "returns a copy of self with each included SortedSet flattened" do
+      klass = SortedSet_FlattenSpecs::ComparableSortedSet
+      set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
+      flattened_set = set.flatten
 
-    flattened_set.should_not equal(set)
-    flattened_set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
+      flattened_set.should_not equal(set)
+      flattened_set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
+    end
   end
-end
 
-describe "SortedSet#flatten!" do
-  it "flattens self" do
-    klass = SortedSet_FlattenSpecs::ComparableSortedSet
-    set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
-    set.flatten!
-    set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
-  end
+  describe "SortedSet#flatten!" do
+    it "flattens self" do
+      klass = SortedSet_FlattenSpecs::ComparableSortedSet
+      set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
+      set.flatten!
+      set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
+    end
 
-  it "returns self when self was modified" do
-    klass = SortedSet_FlattenSpecs::ComparableSortedSet
-    set = klass[klass[1,2], klass[3,4]]
-    set.flatten!.should equal(set)
-  end
+    it "returns self when self was modified" do
+      klass = SortedSet_FlattenSpecs::ComparableSortedSet
+      set = klass[klass[1,2], klass[3,4]]
+      set.flatten!.should equal(set)
+    end
 
-  it "returns nil when self was not modified" do
-    set = SortedSet[1, 2, 3, 4]
-    set.flatten!.should be_nil
+    it "returns nil when self was not modified" do
+      set = SortedSet[1, 2, 3, 4]
+      set.flatten!.should be_nil
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/hash_spec.rb b/spec/ruby/library/set/sortedset/hash_spec.rb
index 7833c68a10..40676de7fc 100644
--- a/spec/ruby/library/set/sortedset/hash_spec.rb
+++ b/spec/ruby/library/set/sortedset/hash_spec.rb
@@ -1,13 +1,16 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#hash" do
-  it "is static" do
-    SortedSet[].hash.should == SortedSet[].hash
-    SortedSet[1, 2, 3].hash.should == SortedSet[1, 2, 3].hash
-    SortedSet["a", "b", "c"].hash.should == SortedSet["c", "b", "a"].hash
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-    SortedSet[].hash.should_not == SortedSet[1, 2, 3].hash
-    SortedSet[1, 2, 3].hash.should_not == SortedSet["a", "b", "c"].hash
+  describe "SortedSet#hash" do
+    it "is static" do
+      SortedSet[].hash.should == SortedSet[].hash
+      SortedSet[1, 2, 3].hash.should == SortedSet[1, 2, 3].hash
+      SortedSet["a", "b", "c"].hash.should == SortedSet["c", "b", "a"].hash
+
+      SortedSet[].hash.should_not == SortedSet[1, 2, 3].hash
+      SortedSet[1, 2, 3].hash.should_not == SortedSet["a", "b", "c"].hash
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/include_spec.rb b/spec/ruby/library/set/sortedset/include_spec.rb
index 030a9e146a..ec2ad987d5 100644
--- a/spec/ruby/library/set/sortedset/include_spec.rb
+++ b/spec/ruby/library/set/sortedset/include_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/include'
-require 'set'
 
-describe "SortedSet#include?" do
-  it_behaves_like :sorted_set_include, :include?
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/include'
+  require 'set'
+
+  describe "SortedSet#include?" do
+    it_behaves_like :sorted_set_include, :include?
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/initialize_spec.rb b/spec/ruby/library/set/sortedset/initialize_spec.rb
index 1238f4efc4..4d1707b72a 100644
--- a/spec/ruby/library/set/sortedset/initialize_spec.rb
+++ b/spec/ruby/library/set/sortedset/initialize_spec.rb
@@ -1,30 +1,33 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#initialize" do
-  it "is private" do
-    SortedSet.should have_private_instance_method("initialize")
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "adds all elements of the passed Enumerable to self" do
-    s = SortedSet.new([1, 2, 3])
-    s.size.should eql(3)
-    s.should include(1)
-    s.should include(2)
-    s.should include(3)
-  end
+  describe "SortedSet#initialize" do
+    it "is private" do
+      SortedSet.should have_private_instance_method("initialize")
+    end
 
-  it "preprocesses all elements by a passed block before adding to self" do
-    s = SortedSet.new([1, 2, 3]) { |x| x * x }
-    s.size.should eql(3)
-    s.should include(1)
-    s.should include(4)
-    s.should include(9)
-  end
+    it "adds all elements of the passed Enumerable to self" do
+      s = SortedSet.new([1, 2, 3])
+      s.size.should eql(3)
+      s.should include(1)
+      s.should include(2)
+      s.should include(3)
+    end
+
+    it "preprocesses all elements by a passed block before adding to self" do
+      s = SortedSet.new([1, 2, 3]) { |x| x * x }
+      s.size.should eql(3)
+      s.should include(1)
+      s.should include(4)
+      s.should include(9)
+    end
 
-  it "raises on incompatible <=> comparison" do
-    # Use #to_a here as elements are sorted only when needed.
-    # Therefore the <=> incompatibility is only noticed on sorting.
-    -> { SortedSet.new(['00', nil]).to_a }.should raise_error(ArgumentError)
+    it "raises on incompatible <=> comparison" do
+      # Use #to_a here as elements are sorted only when needed.
+      # Therefore the <=> incompatibility is only noticed on sorting.
+      -> { SortedSet.new(['00', nil]).to_a }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/inspect_spec.rb b/spec/ruby/library/set/sortedset/inspect_spec.rb
index 7103bee3f5..1c4dd9e6e2 100644
--- a/spec/ruby/library/set/sortedset/inspect_spec.rb
+++ b/spec/ruby/library/set/sortedset/inspect_spec.rb
@@ -1,10 +1,13 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#inspect" do
-  it "returns a String representation of self" do
-    SortedSet[].inspect.should be_kind_of(String)
-    SortedSet[1, 2, 3].inspect.should be_kind_of(String)
-    SortedSet["1", "2", "3"].inspect.should be_kind_of(String)
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  describe "SortedSet#inspect" do
+    it "returns a String representation of self" do
+      SortedSet[].inspect.should be_kind_of(String)
+      SortedSet[1, 2, 3].inspect.should be_kind_of(String)
+      SortedSet["1", "2", "3"].inspect.should be_kind_of(String)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/intersection_spec.rb b/spec/ruby/library/set/sortedset/intersection_spec.rb
index 6ff9c80ce1..6daa271b73 100644
--- a/spec/ruby/library/set/sortedset/intersection_spec.rb
+++ b/spec/ruby/library/set/sortedset/intersection_spec.rb
@@ -1,11 +1,14 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/intersection'
-require 'set'
 
-describe "SortedSet#intersection" do
-  it_behaves_like :sorted_set_intersection, :intersection
-end
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/intersection'
+  require 'set'
+
+  describe "SortedSet#intersection" do
+    it_behaves_like :sorted_set_intersection, :intersection
+  end
 
-describe "SortedSet#&" do
-  it_behaves_like :sorted_set_intersection, :&
+  describe "SortedSet#&" do
+    it_behaves_like :sorted_set_intersection, :&
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/keep_if_spec.rb b/spec/ruby/library/set/sortedset/keep_if_spec.rb
index 2235eb3766..3e5f3bbc47 100644
--- a/spec/ruby/library/set/sortedset/keep_if_spec.rb
+++ b/spec/ruby/library/set/sortedset/keep_if_spec.rb
@@ -1,31 +1,34 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#keep_if" do
-  before :each do
-    @set = SortedSet["one", "two", "three"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    ret = []
-    @set.keep_if { |x| ret << x }
-    ret.should == ["one", "two", "three"].sort
-  end
+  describe "SortedSet#keep_if" do
+    before :each do
+      @set = SortedSet["one", "two", "three"]
+    end
 
-  it "keeps every element from self for which the passed block returns true" do
-    @set.keep_if { |x| x.size != 3 }
-    @set.to_a.should == ["three"]
-  end
+    it "yields each Object in self in sorted order" do
+      ret = []
+      @set.keep_if { |x| ret << x }
+      ret.should == ["one", "two", "three"].sort
+    end
 
-  it "returns self" do
-    @set.keep_if {}.should equal(@set)
-  end
+    it "keeps every element from self for which the passed block returns true" do
+      @set.keep_if { |x| x.size != 3 }
+      @set.to_a.should == ["three"]
+    end
+
+    it "returns self" do
+      @set.keep_if {}.should equal(@set)
+    end
 
-  it "returns an Enumerator when passed no block" do
-    enum = @set.keep_if
-    enum.should be_an_instance_of(Enumerator)
+    it "returns an Enumerator when passed no block" do
+      enum = @set.keep_if
+      enum.should be_an_instance_of(Enumerator)
 
-    enum.each { |x| x.size != 3 }
-    @set.to_a.should == ["three"]
+      enum.each { |x| x.size != 3 }
+      @set.to_a.should == ["three"]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/length_spec.rb b/spec/ruby/library/set/sortedset/length_spec.rb
index 5f138dd6f7..de6791f6bb 100644
--- a/spec/ruby/library/set/sortedset/length_spec.rb
+++ b/spec/ruby/library/set/sortedset/length_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/length'
-require 'set'
 
-describe "SortedSet#length" do
-  it_behaves_like :sorted_set_length, :length
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/length'
+  require 'set'
+
+  describe "SortedSet#length" do
+    it_behaves_like :sorted_set_length, :length
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/map_spec.rb b/spec/ruby/library/set/sortedset/map_spec.rb
index 1d7b5954e5..4971b9529b 100644
--- a/spec/ruby/library/set/sortedset/map_spec.rb
+++ b/spec/ruby/library/set/sortedset/map_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/collect'
 
-describe "SortedSet#map!" do
-  it_behaves_like :sorted_set_collect_bang, :map!
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/collect'
+
+  describe "SortedSet#map!" do
+    it_behaves_like :sorted_set_collect_bang, :map!
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/member_spec.rb b/spec/ruby/library/set/sortedset/member_spec.rb
index d6005557ab..142b09b651 100644
--- a/spec/ruby/library/set/sortedset/member_spec.rb
+++ b/spec/ruby/library/set/sortedset/member_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/include'
-require 'set'
 
-describe "SortedSet#member?" do
-  it_behaves_like :sorted_set_include, :member?
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/include'
+  require 'set'
+
+  describe "SortedSet#member?" do
+    it_behaves_like :sorted_set_include, :member?
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/merge_spec.rb b/spec/ruby/library/set/sortedset/merge_spec.rb
index 31570ad4db..c4cbc6d2b4 100644
--- a/spec/ruby/library/set/sortedset/merge_spec.rb
+++ b/spec/ruby/library/set/sortedset/merge_spec.rb
@@ -1,19 +1,22 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#merge" do
-  it "adds the elements of the passed Enumerable to self" do
-    SortedSet["a", "b"].merge(SortedSet["b", "c", "d"]).should == SortedSet["a", "b", "c", "d"]
-    SortedSet[1, 2].merge([3, 4]).should == SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns self" do
-    set = SortedSet[1, 2]
-    set.merge([3, 4]).should equal(set)
-  end
+  describe "SortedSet#merge" do
+    it "adds the elements of the passed Enumerable to self" do
+      SortedSet["a", "b"].merge(SortedSet["b", "c", "d"]).should == SortedSet["a", "b", "c", "d"]
+      SortedSet[1, 2].merge([3, 4]).should == SortedSet[1, 2, 3, 4]
+    end
+
+    it "returns self" do
+      set = SortedSet[1, 2]
+      set.merge([3, 4]).should equal(set)
+    end
 
-  it "raises an ArgumentError when passed a non-Enumerable" do
-    -> { SortedSet[1, 2].merge(1) }.should raise_error(ArgumentError)
-    -> { SortedSet[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-Enumerable" do
+      -> { SortedSet[1, 2].merge(1) }.should raise_error(ArgumentError)
+      -> { SortedSet[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/minus_spec.rb b/spec/ruby/library/set/sortedset/minus_spec.rb
index ffb8ee85d1..d6abc5e204 100644
--- a/spec/ruby/library/set/sortedset/minus_spec.rb
+++ b/spec/ruby/library/set/sortedset/minus_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require 'set'
-require_relative 'shared/difference'
 
-describe "SortedSet#-" do
-  it_behaves_like :sorted_set_difference, :-
+ruby_version_is ""..."3.0" do
+  require 'set'
+  require_relative 'shared/difference'
+
+  describe "SortedSet#-" do
+    it_behaves_like :sorted_set_difference, :-
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/plus_spec.rb b/spec/ruby/library/set/sortedset/plus_spec.rb
index 355c775d7e..13fc873ad1 100644
--- a/spec/ruby/library/set/sortedset/plus_spec.rb
+++ b/spec/ruby/library/set/sortedset/plus_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/union'
-require 'set'
 
-describe "SortedSet#+" do
-  it_behaves_like :sorted_set_union, :+
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/union'
+  require 'set'
+
+  describe "SortedSet#+" do
+    it_behaves_like :sorted_set_union, :+
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/pretty_print_cycle_spec.rb b/spec/ruby/library/set/sortedset/pretty_print_cycle_spec.rb
index fe15f1bf7d..e97f509406 100644
--- a/spec/ruby/library/set/sortedset/pretty_print_cycle_spec.rb
+++ b/spec/ruby/library/set/sortedset/pretty_print_cycle_spec.rb
@@ -1,10 +1,13 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#pretty_print_cycle" do
-  it "passes the 'pretty print' representation of a self-referencing SortedSet to the pretty print writer" do
-    pp = mock("PrettyPrint")
-    pp.should_receive(:text).with("#<SortedSet: {...}>")
-    SortedSet[1, 2, 3].pretty_print_cycle(pp)
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  describe "SortedSet#pretty_print_cycle" do
+    it "passes the 'pretty print' representation of a self-referencing SortedSet to the pretty print writer" do
+      pp = mock("PrettyPrint")
+      pp.should_receive(:text).with("#<SortedSet: {...}>")
+      SortedSet[1, 2, 3].pretty_print_cycle(pp)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/pretty_print_spec.rb b/spec/ruby/library/set/sortedset/pretty_print_spec.rb
index 601ff4d182..a8088bf797 100644
--- a/spec/ruby/library/set/sortedset/pretty_print_spec.rb
+++ b/spec/ruby/library/set/sortedset/pretty_print_spec.rb
@@ -1,17 +1,20 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#pretty_print" do
-  it "passes the 'pretty print' representation of self to the pretty print writer" do
-    pp = mock("PrettyPrint")
-    set = SortedSet[1, 2, 3]
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-    pp.should_receive(:text).with("#<SortedSet: {")
-    pp.should_receive(:text).with("}>")
+  describe "SortedSet#pretty_print" do
+    it "passes the 'pretty print' representation of self to the pretty print writer" do
+      pp = mock("PrettyPrint")
+      set = SortedSet[1, 2, 3]
 
-    pp.should_receive(:nest).with(1).and_yield
-    pp.should_receive(:seplist).with(set)
+      pp.should_receive(:text).with("#<SortedSet: {")
+      pp.should_receive(:text).with("}>")
 
-    set.pretty_print(pp)
+      pp.should_receive(:nest).with(1).and_yield
+      pp.should_receive(:seplist).with(set)
+
+      set.pretty_print(pp)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/proper_subset_spec.rb b/spec/ruby/library/set/sortedset/proper_subset_spec.rb
index 818173a7f9..34fb89d13d 100644
--- a/spec/ruby/library/set/sortedset/proper_subset_spec.rb
+++ b/spec/ruby/library/set/sortedset/proper_subset_spec.rb
@@ -1,33 +1,36 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#proper_subset?" do
-  before :each do
-    @set = SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns true if passed a SortedSet that self is a proper subset of" do
-    SortedSet[].proper_subset?(@set).should be_true
-    SortedSet[].proper_subset?(SortedSet[1, 2, 3]).should be_true
-    SortedSet[].proper_subset?(SortedSet["a", "b", "c"]).should be_true
+  describe "SortedSet#proper_subset?" do
+    before :each do
+      @set = SortedSet[1, 2, 3, 4]
+    end
 
-    SortedSet[1, 2, 3].proper_subset?(@set).should be_true
-    SortedSet[1, 3].proper_subset?(@set).should be_true
-    SortedSet[1, 2].proper_subset?(@set).should be_true
-    SortedSet[1].proper_subset?(@set).should be_true
+    it "returns true if passed a SortedSet that self is a proper subset of" do
+      SortedSet[].proper_subset?(@set).should be_true
+      SortedSet[].proper_subset?(SortedSet[1, 2, 3]).should be_true
+      SortedSet[].proper_subset?(SortedSet["a", "b", "c"]).should be_true
 
-    SortedSet[5].proper_subset?(@set).should be_false
-    SortedSet[1, 5].proper_subset?(@set).should be_false
-    SortedSet["test"].proper_subset?(@set).should be_false
+      SortedSet[1, 2, 3].proper_subset?(@set).should be_true
+      SortedSet[1, 3].proper_subset?(@set).should be_true
+      SortedSet[1, 2].proper_subset?(@set).should be_true
+      SortedSet[1].proper_subset?(@set).should be_true
 
-    @set.proper_subset?(@set).should be_false
-    SortedSet[].proper_subset?(SortedSet[]).should be_false
-  end
+      SortedSet[5].proper_subset?(@set).should be_false
+      SortedSet[1, 5].proper_subset?(@set).should be_false
+      SortedSet["test"].proper_subset?(@set).should be_false
+
+      @set.proper_subset?(@set).should be_false
+      SortedSet[].proper_subset?(SortedSet[]).should be_false
+    end
 
-  it "raises an ArgumentError when passed a non-SortedSet" do
-    -> { SortedSet[].proper_subset?([]) }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_subset?(1) }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_subset?("test") }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_subset?(Object.new) }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-SortedSet" do
+      -> { SortedSet[].proper_subset?([]) }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_subset?(1) }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_subset?("test") }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_subset?(Object.new) }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/proper_superset_spec.rb b/spec/ruby/library/set/sortedset/proper_superset_spec.rb
index 2699290f0e..8b92444f72 100644
--- a/spec/ruby/library/set/sortedset/proper_superset_spec.rb
+++ b/spec/ruby/library/set/sortedset/proper_superset_spec.rb
@@ -1,33 +1,36 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#proper_superset?" do
-  before :each do
-    @set = SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns true if passed a SortedSet that self is a proper superset of" do
-    @set.proper_superset?(SortedSet[]).should be_true
-    SortedSet[1, 2, 3].proper_superset?(SortedSet[]).should be_true
-    SortedSet["a", "b", "c"].proper_superset?(SortedSet[]).should be_true
+  describe "SortedSet#proper_superset?" do
+    before :each do
+      @set = SortedSet[1, 2, 3, 4]
+    end
 
-    @set.proper_superset?(SortedSet[1, 2, 3]).should be_true
-    @set.proper_superset?(SortedSet[1, 3]).should be_true
-    @set.proper_superset?(SortedSet[1, 2]).should be_true
-    @set.proper_superset?(SortedSet[1]).should be_true
+    it "returns true if passed a SortedSet that self is a proper superset of" do
+      @set.proper_superset?(SortedSet[]).should be_true
+      SortedSet[1, 2, 3].proper_superset?(SortedSet[]).should be_true
+      SortedSet["a", "b", "c"].proper_superset?(SortedSet[]).should be_true
 
-    @set.proper_superset?(SortedSet[5]).should be_false
-    @set.proper_superset?(SortedSet[1, 5]).should be_false
-    @set.proper_superset?(SortedSet["test"]).should be_false
+      @set.proper_superset?(SortedSet[1, 2, 3]).should be_true
+      @set.proper_superset?(SortedSet[1, 3]).should be_true
+      @set.proper_superset?(SortedSet[1, 2]).should be_true
+      @set.proper_superset?(SortedSet[1]).should be_true
 
-    @set.proper_superset?(@set).should be_false
-    SortedSet[].proper_superset?(SortedSet[]).should be_false
-  end
+      @set.proper_superset?(SortedSet[5]).should be_false
+      @set.proper_superset?(SortedSet[1, 5]).should be_false
+      @set.proper_superset?(SortedSet["test"]).should be_false
+
+      @set.proper_superset?(@set).should be_false
+      SortedSet[].proper_superset?(SortedSet[]).should be_false
+    end
 
-  it "raises an ArgumentError when passed a non-SortedSet" do
-    -> { SortedSet[].proper_superset?([]) }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_superset?(1) }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_superset?("test") }.should raise_error(ArgumentError)
-    -> { SortedSet[].proper_superset?(Object.new) }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-SortedSet" do
+      -> { SortedSet[].proper_superset?([]) }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_superset?(1) }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_superset?("test") }.should raise_error(ArgumentError)
+      -> { SortedSet[].proper_superset?(Object.new) }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/reject_spec.rb b/spec/ruby/library/set/sortedset/reject_spec.rb
index da2a76e7a7..396b864cc5 100644
--- a/spec/ruby/library/set/sortedset/reject_spec.rb
+++ b/spec/ruby/library/set/sortedset/reject_spec.rb
@@ -1,42 +1,45 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#reject!" do
-  before :each do
-    @set = SortedSet["one", "two", "three"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "yields each Object in self in sorted order" do
-    res = []
-    @set.reject! { |x| res << x }
-    res.should == ["one", "two", "three"].sort
-  end
+  describe "SortedSet#reject!" do
+    before :each do
+      @set = SortedSet["one", "two", "three"]
+    end
 
-  it "deletes every element from self for which the passed block returns true" do
-    @set.reject! { |x| x.size == 3 }
-    @set.size.should eql(1)
+    it "yields each Object in self in sorted order" do
+      res = []
+      @set.reject! { |x| res << x }
+      res.should == ["one", "two", "three"].sort
+    end
 
-    @set.should_not include("one")
-    @set.should_not include("two")
-    @set.should include("three")
-  end
+    it "deletes every element from self for which the passed block returns true" do
+      @set.reject! { |x| x.size == 3 }
+      @set.size.should eql(1)
 
-  it "returns self when self was modified" do
-    @set.reject! { |x| true }.should equal(@set)
-  end
+      @set.should_not include("one")
+      @set.should_not include("two")
+      @set.should include("three")
+    end
 
-  it "returns nil when self was not modified" do
-    @set.reject! { |x| false }.should be_nil
-  end
+    it "returns self when self was modified" do
+      @set.reject! { |x| true }.should equal(@set)
+    end
+
+    it "returns nil when self was not modified" do
+      @set.reject! { |x| false }.should be_nil
+    end
 
-  it "returns an Enumerator when passed no block" do
-    enum = @set.reject!
-    enum.should be_an_instance_of(Enumerator)
+    it "returns an Enumerator when passed no block" do
+      enum = @set.reject!
+      enum.should be_an_instance_of(Enumerator)
 
-    enum.each { |x| x.size == 3 }
+      enum.each { |x| x.size == 3 }
 
-    @set.should_not include("one")
-    @set.should_not include("two")
-    @set.should include("three")
+      @set.should_not include("one")
+      @set.should_not include("two")
+      @set.should include("three")
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/replace_spec.rb b/spec/ruby/library/set/sortedset/replace_spec.rb
index 2a7fa73efb..2900221c01 100644
--- a/spec/ruby/library/set/sortedset/replace_spec.rb
+++ b/spec/ruby/library/set/sortedset/replace_spec.rb
@@ -1,17 +1,20 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#replace" do
-  before :each do
-    @set = SortedSet["a", "b", "c"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "replaces the contents with other and returns self" do
-    @set.replace(SortedSet[1, 2, 3]).should == @set
-    @set.should == SortedSet[1, 2, 3]
-  end
+  describe "SortedSet#replace" do
+    before :each do
+      @set = SortedSet["a", "b", "c"]
+    end
+
+    it "replaces the contents with other and returns self" do
+      @set.replace(SortedSet[1, 2, 3]).should == @set
+      @set.should == SortedSet[1, 2, 3]
+    end
 
-  it "accepts any enumerable as other" do
-    @set.replace([1, 2, 3]).should == SortedSet[1, 2, 3]
+    it "accepts any enumerable as other" do
+      @set.replace([1, 2, 3]).should == SortedSet[1, 2, 3]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/select_spec.rb b/spec/ruby/library/set/sortedset/select_spec.rb
index 68326cd02c..fc4c15ee4d 100644
--- a/spec/ruby/library/set/sortedset/select_spec.rb
+++ b/spec/ruby/library/set/sortedset/select_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/select'
-require 'set'
 
-describe "SortedSet#select!" do
-  it_behaves_like :sorted_set_select_bang, :select!
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/select'
+  require 'set'
+
+  describe "SortedSet#select!" do
+    it_behaves_like :sorted_set_select_bang, :select!
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/size_spec.rb b/spec/ruby/library/set/sortedset/size_spec.rb
index 13e5085b0c..d908b33b53 100644
--- a/spec/ruby/library/set/sortedset/size_spec.rb
+++ b/spec/ruby/library/set/sortedset/size_spec.rb
@@ -1,7 +1,10 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/length'
-require 'set'
 
-describe "SortedSet#size" do
-  it_behaves_like :sorted_set_length, :size
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/length'
+  require 'set'
+
+  describe "SortedSet#size" do
+    it_behaves_like :sorted_set_length, :size
+  end
 end
diff --git a/spec/ruby/library/set/sortedset/subset_spec.rb b/spec/ruby/library/set/sortedset/subset_spec.rb
index 7768692df6..272e3f985e 100644
--- a/spec/ruby/library/set/sortedset/subset_spec.rb
+++ b/spec/ruby/library/set/sortedset/subset_spec.rb
@@ -1,33 +1,36 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#subset?" do
-  before :each do
-    @set = SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns true if passed a SortedSet that is equal to self or self is a subset of" do
-    @set.subset?(@set).should be_true
-    SortedSet[].subset?(SortedSet[]).should be_true
+  describe "SortedSet#subset?" do
+    before :each do
+      @set = SortedSet[1, 2, 3, 4]
+    end
 
-    SortedSet[].subset?(@set).should be_true
-    SortedSet[].subset?(SortedSet[1, 2, 3]).should be_true
-    SortedSet[].subset?(SortedSet["a", "b", "c"]).should be_true
+    it "returns true if passed a SortedSet that is equal to self or self is a subset of" do
+      @set.subset?(@set).should be_true
+      SortedSet[].subset?(SortedSet[]).should be_true
 
-    SortedSet[1, 2, 3].subset?(@set).should be_true
-    SortedSet[1, 3].subset?(@set).should be_true
-    SortedSet[1, 2].subset?(@set).should be_true
-    SortedSet[1].subset?(@set).should be_true
+      SortedSet[].subset?(@set).should be_true
+      SortedSet[].subset?(SortedSet[1, 2, 3]).should be_true
+      SortedSet[].subset?(SortedSet["a", "b", "c"]).should be_true
 
-    SortedSet[5].subset?(@set).should be_false
-    SortedSet[1, 5].subset?(@set).should be_false
-    SortedSet["test"].subset?(@set).should be_false
-  end
+      SortedSet[1, 2, 3].subset?(@set).should be_true
+      SortedSet[1, 3].subset?(@set).should be_true
+      SortedSet[1, 2].subset?(@set).should be_true
+      SortedSet[1].subset?(@set).should be_true
+
+      SortedSet[5].subset?(@set).should be_false
+      SortedSet[1, 5].subset?(@set).should be_false
+      SortedSet["test"].subset?(@set).should be_false
+    end
 
-  it "raises an ArgumentError when passed a non-SortedSet" do
-    -> { SortedSet[].subset?([]) }.should raise_error(ArgumentError)
-    -> { SortedSet[].subset?(1) }.should raise_error(ArgumentError)
-    -> { SortedSet[].subset?("test") }.should raise_error(ArgumentError)
-    -> { SortedSet[].subset?(Object.new) }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-SortedSet" do
+      -> { SortedSet[].subset?([]) }.should raise_error(ArgumentError)
+      -> { SortedSet[].subset?(1) }.should raise_error(ArgumentError)
+      -> { SortedSet[].subset?("test") }.should raise_error(ArgumentError)
+      -> { SortedSet[].subset?(Object.new) }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/subtract_spec.rb b/spec/ruby/library/set/sortedset/subtract_spec.rb
index 64d66c3688..b2af127f89 100644
--- a/spec/ruby/library/set/sortedset/subtract_spec.rb
+++ b/spec/ruby/library/set/sortedset/subtract_spec.rb
@@ -1,17 +1,20 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#subtract" do
-  before :each do
-    @set = SortedSet["a", "b", "c"]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "deletes any elements contained in other and returns self" do
-    @set.subtract(SortedSet["b", "c"]).should == @set
-    @set.should == SortedSet["a"]
-  end
+  describe "SortedSet#subtract" do
+    before :each do
+      @set = SortedSet["a", "b", "c"]
+    end
+
+    it "deletes any elements contained in other and returns self" do
+      @set.subtract(SortedSet["b", "c"]).should == @set
+      @set.should == SortedSet["a"]
+    end
 
-  it "accepts any enumerable as other" do
-    @set.subtract(["c"]).should == SortedSet["a", "b"]
+    it "accepts any enumerable as other" do
+      @set.subtract(["c"]).should == SortedSet["a", "b"]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/superset_spec.rb b/spec/ruby/library/set/sortedset/superset_spec.rb
index 823781b860..a1bbacb966 100644
--- a/spec/ruby/library/set/sortedset/superset_spec.rb
+++ b/spec/ruby/library/set/sortedset/superset_spec.rb
@@ -1,33 +1,36 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#superset?" do
-  before :each do
-    @set = SortedSet[1, 2, 3, 4]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
 
-  it "returns true if passed a SortedSet that equals self or self is a proper superset of" do
-    @set.superset?(@set).should be_true
-    SortedSet[].superset?(SortedSet[]).should be_true
+  describe "SortedSet#superset?" do
+    before :each do
+      @set = SortedSet[1, 2, 3, 4]
+    end
 
-    @set.superset?(SortedSet[]).should be_true
-    SortedSet[1, 2, 3].superset?(SortedSet[]).should be_true
-    SortedSet["a", "b", "c"].superset?(SortedSet[]).should be_true
+    it "returns true if passed a SortedSet that equals self or self is a proper superset of" do
+      @set.superset?(@set).should be_true
+      SortedSet[].superset?(SortedSet[]).should be_true
 
-    @set.superset?(SortedSet[1, 2, 3]).should be_true
-    @set.superset?(SortedSet[1, 3]).should be_true
-    @set.superset?(SortedSet[1, 2]).should be_true
-    @set.superset?(SortedSet[1]).should be_true
+      @set.superset?(SortedSet[]).should be_true
+      SortedSet[1, 2, 3].superset?(SortedSet[]).should be_true
+      SortedSet["a", "b", "c"].superset?(SortedSet[]).should be_true
 
-    @set.superset?(SortedSet[5]).should be_false
-    @set.superset?(SortedSet[1, 5]).should be_false
-    @set.superset?(SortedSet["test"]).should be_false
-  end
+      @set.superset?(SortedSet[1, 2, 3]).should be_true
+      @set.superset?(SortedSet[1, 3]).should be_true
+      @set.superset?(SortedSet[1, 2]).should be_true
+      @set.superset?(SortedSet[1]).should be_true
+
+      @set.superset?(SortedSet[5]).should be_false
+      @set.superset?(SortedSet[1, 5]).should be_false
+      @set.superset?(SortedSet["test"]).should be_false
+    end
 
-  it "raises an ArgumentError when passed a non-SortedSet" do
-    -> { SortedSet[].superset?([]) }.should raise_error(ArgumentError)
-    -> { SortedSet[].superset?(1) }.should raise_error(ArgumentError)
-    -> { SortedSet[].superset?("test") }.should raise_error(ArgumentError)
-    -> { SortedSet[].superset?(Object.new) }.should raise_error(ArgumentError)
+    it "raises an ArgumentError when passed a non-SortedSet" do
+      -> { SortedSet[].superset?([]) }.should raise_error(ArgumentError)
+      -> { SortedSet[].superset?(1) }.should raise_error(ArgumentError)
+      -> { SortedSet[].superset?("test") }.should raise_error(ArgumentError)
+      -> { SortedSet[].superset?(Object.new) }.should raise_error(ArgumentError)
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/to_a_spec.rb b/spec/ruby/library/set/sortedset/to_a_spec.rb
index ba37d18cdb..bb54cd7cdb 100644
--- a/spec/ruby/library/set/sortedset/to_a_spec.rb
+++ b/spec/ruby/library/set/sortedset/to_a_spec.rb
@@ -1,17 +1,20 @@
 require_relative '../../../spec_helper'
-require 'set'
 
-describe "SortedSet#to_a" do
-  it "returns an array containing elements" do
-    set = SortedSet.new [1, 2, 3]
-    set.to_a.should == [1, 2, 3]
-  end
+ruby_version_is ""..."3.0" do
+  require 'set'
+
+  describe "SortedSet#to_a" do
+    it "returns an array containing elements" do
+      set = SortedSet.new [1, 2, 3]
+      set.to_a.should == [1, 2, 3]
+    end
 
-  it "returns a sorted array containing elements" do
-    set = SortedSet[2, 3, 1]
-    set.to_a.should == [1, 2, 3]
+    it "returns a sorted array containing elements" do
+      set = SortedSet[2, 3, 1]
+      set.to_a.should == [1, 2, 3]
 
-    set = SortedSet.new [5, 6, 4, 4]
-    set.to_a.should == [4, 5, 6]
+      set = SortedSet.new [5, 6, 4, 4]
+      set.to_a.should == [4, 5, 6]
+    end
   end
 end
diff --git a/spec/ruby/library/set/sortedset/union_spec.rb b/spec/ruby/library/set/sortedset/union_spec.rb
index eb77600fee..c942f20d3e 100644
--- a/spec/ruby/library/set/sortedset/union_spec.rb
+++ b/spec/ruby/library/set/sortedset/union_spec.rb
@@ -1,11 +1,14 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/union'
-require 'set'
 
-describe "SortedSet#union" do
-  it_behaves_like :sorted_set_union, :union
-end
+ruby_version_is ""..."3.0" do
+  require_relative 'shared/union'
+  require 'set'
+
+  describe "SortedSet#union" do
+    it_behaves_like :sorted_set_union, :union
+  end
 
-describe "SortedSet#|" do
-  it_behaves_like :sorted_set_union, :|
+  describe "SortedSet#|" do
+    it_behaves_like :sorted_set_union, :|
+  end
 end
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