1 files changed, 139 insertions, 0 deletions
diff --git a/spec/rubyspec/core/comparable/equal_value_spec.rb b/spec/rubyspec/core/comparable/equal_value_spec.rb
new file mode 100644
index 0000000000..2bc22771b4
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+++ b/spec/rubyspec/core/comparable/equal_value_spec.rb
@@ -0,0 +1,139 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Comparable#==" do
+  a = b = nil
+  before :each do
+    a = ComparableSpecs::Weird.new(0)
+    b = ComparableSpecs::Weird.new(10)
+  end
+
+  it "returns true if other is the same as self" do
+    (a == a).should == true
+    (b == b).should == true
+  end
+
+  it "calls #<=> on self with other and returns true if #<=> returns 0" do
+    a.should_receive(:<=>).once.and_return(0)
+    (a == b).should == true
+  end
+
+  it "calls #<=> on self with other and returns true if #<=> returns 0.0" do
+    a.should_receive(:<=>).once.and_return(0.0)
+    (a == b).should == true
+  end
+
+  it "returns false if calling #<=> on self returns a positive Integer" do
+    a.should_receive(:<=>).once.and_return(1)
+    (a == b).should == false
+  end
+
+  it "returns false if calling #<=> on self returns a negative Integer" do
+    a.should_receive(:<=>).once.and_return(-1)
+    (a == b).should == false
+  end
+
+  context "when #<=> returns nil" do
+    before :each do
+      a.should_receive(:<=>).once.and_return(nil)
+    end
+
+    it "returns false" do
+      (a == b).should be_false
+    end
+  end
+
+  context "when #<=> returns nor nil neither an Integer" do
+    before :each do
+      a.should_receive(:<=>).once.and_return("abc")
+    end
+
+    ruby_version_is ""..."2.3" do
+      it "returns false" do
+        (a == b).should be_false
+      end
+    end
+
+    ruby_version_is "2.3" do
+      it "raises an ArgumentError" do
+        lambda { (a == b) }.should raise_error(ArgumentError)
+      end
+    end
+  end
+
+  context "when #<=> raises an exception" do
+    context "if it is a StandardError" do
+      before :each do
+        a.should_receive(:<=>).once.and_raise(StandardError)
+      end
+
+      ruby_version_is ""..."2.3" do
+        # Behaviour confirmed by MRI test suite
+        it "returns false" do
+          (a == b).should be_false
+        end
+      end
+
+      ruby_version_is "2.3" do
+        it "lets it go through" do
+          lambda { (a == b) }.should raise_error(StandardError)
+        end
+      end
+    end
+
+    context "if it is a subclass of StandardError" do
+      # TypeError < StandardError
+      before :each do
+        a.should_receive(:<=>).once.and_raise(TypeError)
+      end
+
+      ruby_version_is ""..."2.3" do
+        it "returns false" do
+          (a == b).should be_false
+        end
+      end
+
+      ruby_version_is "2.3" do
+        it "lets it go through" do
+          lambda { (a == b) }.should raise_error(TypeError)
+        end
+      end
+    end
+
+    it "lets it go through if it is not a StandardError" do
+      a.should_receive(:<=>).once.and_raise(Exception)
+      lambda { (a == b) }.should raise_error(Exception)
+    end
+  end
+
+  context "when #<=> is not defined" do
+    before :each do
+      @a = ComparableSpecs::WithoutCompareDefined.new
+      @b = ComparableSpecs::WithoutCompareDefined.new
+    end
+
+    it "returns true for identical objects" do
+      @a.should == @a
+    end
+
+    it "returns false and does not recurse infinitely" do
+      @a.should_not == @b
+    end
+  end
+
+  context "when #<=> calls super" do
+    before :each do
+      @a = ComparableSpecs::CompareCallingSuper.new
+      @b = ComparableSpecs::CompareCallingSuper.new
+    end
+
+    it "returns true for identical objects" do
+      @a.should == @a
+    end
+
+    it "calls the defined #<=> only once for different objects" do
+      @a.should_not == @b
+      @a.calls.should == 1
+    end
+  end
+end