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