1 files changed, 31 insertions, 0 deletions
diff --git a/spec/rubyspec/core/kernel/comparison_spec.rb b/spec/rubyspec/core/kernel/comparison_spec.rb
new file mode 100644
index 0000000000..2aa4358600
--- /dev/null
+++ b/spec/rubyspec/core/kernel/comparison_spec.rb
@@ -0,0 +1,31 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Kernel#<=>" do
+  it "returns 0 if self" do
+    obj = Object.new
+    obj.<=>(obj).should == 0
+  end
+
+  it "returns 0 if self is == to the argument" do
+    obj = mock('has ==')
+    obj.should_receive(:==).and_return(true)
+    obj.<=>(Object.new).should == 0
+  end
+
+  it "returns nil if self is eql? but not == to the argument" do
+    obj = mock('has eql?')
+    obj.should_not_receive(:eql?)
+    obj.<=>(Object.new).should be_nil
+  end
+
+  it "returns nil if self.==(arg) returns nil" do
+    obj = mock('wrong ==')
+    obj.should_receive(:==).and_return(nil)
+    obj.<=>(Object.new).should be_nil
+  end
+
+  it "returns nil if self is not == to the argument" do
+    obj = Object.new
+    obj.<=>(3.14).should be_nil
+  end
+end