1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/basicobject/equal_spec.rb b/spec/ruby/core/basicobject/equal_spec.rb
new file mode 100644
index 0000000000..ce28eaed95
--- /dev/null
+++ b/spec/ruby/core/basicobject/equal_spec.rb
@@ -0,0 +1,54 @@
+require_relative '../../spec_helper'
+require_relative '../../shared/kernel/equal'
+
+describe "BasicObject#equal?" do
+  it "is a public instance method" do
+    BasicObject.should have_public_instance_method(:equal?)
+  end
+
+  it_behaves_like :object_equal, :equal?
+
+  it "is unaffected by overriding __id__" do
+    o1 = mock("object")
+    o2 = mock("object")
+    suppress_warning {
+      def o1.__id__; 10; end
+      def o2.__id__; 10; end
+    }
+    o1.equal?(o2).should be_false
+  end
+
+  it "is unaffected by overriding object_id" do
+    o1 = mock("object")
+    o1.stub!(:object_id).and_return(10)
+    o2 = mock("object")
+    o2.stub!(:object_id).and_return(10)
+    o1.equal?(o2).should be_false
+  end
+
+  it "is unaffected by overriding ==" do
+    # different objects, overriding == to return true
+    o1 = mock("object")
+    o1.stub!(:==).and_return(true)
+    o2 = mock("object")
+    o1.equal?(o2).should be_false
+
+    # same objects, overriding == to return false
+    o3 = mock("object")
+    o3.stub!(:==).and_return(false)
+    o3.equal?(o3).should be_true
+  end
+
+  it "is unaffected by overriding eql?" do
+    # different objects, overriding eql? to return true
+    o1 = mock("object")
+    o1.stub!(:eql?).and_return(true)
+    o2 = mock("object")
+    o1.equal?(o2).should be_false
+
+    # same objects, overriding eql? to return false
+    o3 = mock("object")
+    o3.stub!(:eql?).and_return(false)
+    o3.equal?(o3).should be_true
+  end
+end