9 files changed, 200 insertions, 0 deletions
diff --git a/spec/ruby/core/set/shared/add.rb b/spec/ruby/core/set/shared/add.rb
new file mode 100644
index 0000000000..9e797f5df9
--- /dev/null
+++ b/spec/ruby/core/set/shared/add.rb
@@ -0,0 +1,14 @@
+describe :set_add, shared: true do
+  before :each do
+    @set = Set.new
+  end
+
+  it "adds the passed Object to self" do
+    @set.send(@method, "dog")
+    @set.should include("dog")
+  end
+
+  it "returns self" do
+    @set.send(@method, "dog").should equal(@set)
+  end
+end
diff --git a/spec/ruby/core/set/shared/collect.rb b/spec/ruby/core/set/shared/collect.rb
new file mode 100644
index 0000000000..bc58c231be
--- /dev/null
+++ b/spec/ruby/core/set/shared/collect.rb
@@ -0,0 +1,20 @@
+describe :set_collect_bang, shared: true do
+  before :each do
+    @set = Set[1, 2, 3, 4, 5]
+  end
+
+  it "yields each Object in self" do
+    res = []
+    @set.send(@method) { |x| res << x }
+    res.sort.should == [1, 2, 3, 4, 5].sort
+  end
+
+  it "returns self" do
+    @set.send(@method) { |x| x }.should equal(@set)
+  end
+
+  it "replaces self with the return values of the block" do
+    @set.send(@method) { |x| x * 2 }
+    @set.should == Set[2, 4, 6, 8, 10]
+  end
+end
diff --git a/spec/ruby/core/set/shared/difference.rb b/spec/ruby/core/set/shared/difference.rb
new file mode 100644
index 0000000000..f88987ed2a
--- /dev/null
+++ b/spec/ruby/core/set/shared/difference.rb
@@ -0,0 +1,15 @@
+describe :set_difference, shared: true do
+  before :each do
+    @set = Set[:a, :b, :c]
+  end
+
+  it "returns a new Set containing self's elements excluding the elements in the passed Enumerable" do
+    @set.send(@method, Set[:a, :b]).should == Set[:c]
+    @set.send(@method, [:b, :c]).should == Set[:a]
+  end
+
+  it "raises an ArgumentError when passed a non-Enumerable" do
+    -> { @set.send(@method, 1) }.should raise_error(ArgumentError)
+    -> { @set.send(@method, Object.new) }.should raise_error(ArgumentError)
+  end
+end
diff --git a/spec/ruby/core/set/shared/include.rb b/spec/ruby/core/set/shared/include.rb
new file mode 100644
index 0000000000..b4d95cde24
--- /dev/null
+++ b/spec/ruby/core/set/shared/include.rb
@@ -0,0 +1,29 @@
+describe :set_include, shared: true do
+  it "returns true when self contains the passed Object" do
+    set = Set[:a, :b, :c]
+    set.send(@method, :a).should be_true
+    set.send(@method, :e).should be_false
+  end
+
+  describe "member equality" do
+    it "is checked using both #hash and #eql?" do
+      obj = Object.new
+      obj_another = Object.new
+
+      def obj.hash; 42 end
+      def obj_another.hash; 42 end
+      def obj_another.eql?(o) hash == o.hash end
+
+      set = Set["a", "b", "c", obj]
+      set.send(@method, obj_another).should == true
+    end
+
+    it "is not checked using #==" do
+      obj = Object.new
+      set = Set["a", "b", "c"]
+
+      obj.should_not_receive(:==)
+      set.send(@method, obj)
+    end
+  end
+end
diff --git a/spec/ruby/core/set/shared/inspect.rb b/spec/ruby/core/set/shared/inspect.rb
new file mode 100644
index 0000000000..a90af66c98
--- /dev/null
+++ b/spec/ruby/core/set/shared/inspect.rb
@@ -0,0 +1,45 @@
+describe :set_inspect, shared: true do
+  it "returns a String representation of self" do
+    Set[].send(@method).should be_kind_of(String)
+    Set[nil, false, true].send(@method).should be_kind_of(String)
+    Set[1, 2, 3].send(@method).should be_kind_of(String)
+    Set["1", "2", "3"].send(@method).should be_kind_of(String)
+    Set[:a, "b", Set[?c]].send(@method).should be_kind_of(String)
+  end
+
+  ruby_version_is "4.0" do
+    it "does include the elements of the set" do
+      Set["1"].send(@method).should == 'Set["1"]'
+    end
+  end
+
+  ruby_version_is ""..."4.0" do
+    it "does include the elements of the set" do
+      Set["1"].send(@method).should == '#<Set: {"1"}>'
+    end
+  end
+
+  it "puts spaces between the elements" do
+    Set["1", "2"].send(@method).should include('", "')
+  end
+
+  ruby_version_is "4.0" do
+    it "correctly handles cyclic-references" do
+      set1 = Set[]
+      set2 = Set[set1]
+      set1 << set2
+      set1.send(@method).should be_kind_of(String)
+      set1.send(@method).should include("Set[...]")
+    end
+  end
+
+  ruby_version_is ""..."4.0" do
+    it "correctly handles cyclic-references" do
+      set1 = Set[]
+      set2 = Set[set1]
+      set1 << set2
+      set1.send(@method).should be_kind_of(String)
+      set1.send(@method).should include("#<Set: {...}>")
+    end
+  end
+end
diff --git a/spec/ruby/core/set/shared/intersection.rb b/spec/ruby/core/set/shared/intersection.rb
new file mode 100644
index 0000000000..5ae4199c94
--- /dev/null
+++ b/spec/ruby/core/set/shared/intersection.rb
@@ -0,0 +1,15 @@
+describe :set_intersection, shared: true do
+  before :each do
+    @set = Set[:a, :b, :c]
+  end
+
+  it "returns a new Set containing only elements shared by self and the passed Enumerable" do
+    @set.send(@method, Set[:b, :c, :d, :e]).should == Set[:b, :c]
+    @set.send(@method, [:b, :c, :d]).should == Set[:b, :c]
+  end
+
+  it "raises an ArgumentError when passed a non-Enumerable" do
+    -> { @set.send(@method, 1) }.should raise_error(ArgumentError)
+    -> { @set.send(@method, Object.new) }.should raise_error(ArgumentError)
+  end
+end
diff --git a/spec/ruby/core/set/shared/length.rb b/spec/ruby/core/set/shared/length.rb
new file mode 100644
index 0000000000..a8fcee9f39
--- /dev/null
+++ b/spec/ruby/core/set/shared/length.rb
@@ -0,0 +1,6 @@
+describe :set_length, shared: true do
+  it "returns the number of elements in the set" do
+    set = Set[:a, :b, :c]
+    set.send(@method).should == 3
+  end
+end
diff --git a/spec/ruby/core/set/shared/select.rb b/spec/ruby/core/set/shared/select.rb
new file mode 100644
index 0000000000..467b236ed3
--- /dev/null
+++ b/spec/ruby/core/set/shared/select.rb
@@ -0,0 +1,41 @@
+require_relative '../../../spec_helper'
+
+describe :set_select_bang, shared: true do
+  before :each do
+    @set = Set["one", "two", "three"]
+  end
+
+  it "yields every element of self" do
+    ret = []
+    @set.send(@method) { |x| ret << x }
+    ret.sort.should == ["one", "two", "three"].sort
+  end
+
+  it "keeps every element from self for which the passed block returns true" do
+    @set.send(@method) { |x| x.size != 3 }
+    @set.size.should eql(1)
+
+    @set.should_not include("one")
+    @set.should_not include("two")
+    @set.should include("three")
+  end
+
+  it "returns self when self was modified" do
+    @set.send(@method) { false }.should equal(@set)
+  end
+
+  it "returns nil when self was not modified" do
+    @set.send(@method) { true }.should be_nil
+  end
+
+  it "returns an Enumerator when passed no block" do
+    enum = @set.send(@method)
+    enum.should be_an_instance_of(Enumerator)
+
+    enum.each { |x| x.size != 3 }
+
+    @set.should_not include("one")
+    @set.should_not include("two")
+    @set.should include("three")
+  end
+end
diff --git a/spec/ruby/core/set/shared/union.rb b/spec/ruby/core/set/shared/union.rb
new file mode 100644
index 0000000000..314f0e852d
--- /dev/null
+++ b/spec/ruby/core/set/shared/union.rb
@@ -0,0 +1,15 @@
+describe :set_union, shared: true do
+  before :each do
+    @set = Set[:a, :b, :c]
+  end
+
+  it "returns a new Set containing all elements of self and the passed Enumerable" do
+    @set.send(@method, Set[:b, :d, :e]).should == Set[:a, :b, :c, :d, :e]
+    @set.send(@method, [:b, :e]).should == Set[:a, :b, :c, :e]
+  end
+
+  it "raises an ArgumentError when passed a non-Enumerable" do
+    -> { @set.send(@method, 1) }.should raise_error(ArgumentError)
+    -> { @set.send(@method, Object.new) }.should raise_error(ArgumentError)
+  end
+end