5 files changed, 67 insertions, 13 deletions
diff --git a/spec/ruby/library/set/case_compare_spec.rb b/spec/ruby/library/set/case_compare_spec.rb
new file mode 100644
index 0000000000..f47e4e20c2
--- /dev/null
+++ b/spec/ruby/library/set/case_compare_spec.rb
@@ -0,0 +1,15 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/include', __FILE__)
+require 'set'
+
+ruby_version_is "2.5" do
+  describe "Set#===" do
+    it_behaves_like :set_include, :===
+
+    it "is an alias for include?" do
+      set = Set.new
+      set.method(:===).should == set.method(:include?)
+    end
+  end
+end
+
diff --git a/spec/ruby/library/set/inspect_spec.rb b/spec/ruby/library/set/inspect_spec.rb
index 8a6c565c2e..ef91b11645 100644
--- a/spec/ruby/library/set/inspect_spec.rb
+++ b/spec/ruby/library/set/inspect_spec.rb
@@ -1,18 +1,7 @@
 require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/inspect', __FILE__)
 require 'set'
 
 describe "Set#inspect" do
-  it "returns a String representation of self" do
-    Set[].inspect.should be_kind_of(String)
-    Set[nil, false, true].inspect.should be_kind_of(String)
-    Set[1, 2, 3].inspect.should be_kind_of(String)
-    Set["1", "2", "3"].inspect.should be_kind_of(String)
-    Set[:a, "b", Set[?c]].inspect.should be_kind_of(String)
-  end
-
-  it "correctly handles self-references" do
-    (set = Set[]) << set
-    set.inspect.should be_kind_of(String)
-    set.inspect.should include("#<Set: {...}>")
-  end
+  it_behaves_like :set_inspect, :inspect
 end
diff --git a/spec/ruby/library/set/shared/include.rb b/spec/ruby/library/set/shared/include.rb
index d41f8f4102..b4d95cde24 100644
--- a/spec/ruby/library/set/shared/include.rb
+++ b/spec/ruby/library/set/shared/include.rb
@@ -4,4 +4,26 @@ describe :set_include, shared: true do
     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/library/set/shared/inspect.rb b/spec/ruby/library/set/shared/inspect.rb
new file mode 100644
index 0000000000..69fbdd12f6
--- /dev/null
+++ b/spec/ruby/library/set/shared/inspect.rb
@@ -0,0 +1,15 @@
+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
+
+  it "correctly handles self-references" do
+    (set = Set[]) << set
+    set.send(@method).should be_kind_of(String)
+    set.send(@method).should include("#<Set: {...}>")
+  end
+end
diff --git a/spec/ruby/library/set/to_s_spec.rb b/spec/ruby/library/set/to_s_spec.rb
new file mode 100644
index 0000000000..f4c361f74f
--- /dev/null
+++ b/spec/ruby/library/set/to_s_spec.rb
@@ -0,0 +1,13 @@
+require File.expand_path('../shared/inspect', __FILE__)
+require 'set'
+
+ruby_version_is "2.5" do
+  describe "Set#to_s" do
+    it_behaves_like :set_inspect, :to_s
+
+    it "is an alias of inspect" do
+      set = Set.new
+      set.method(:to_s).should == set.method(:inspect)
+    end
+  end
+end