diff options
Diffstat (limited to 'spec/ruby/core/comparable/equal_value_spec.rb')
-rw-r--r-- | spec/ruby/core/comparable/equal_value_spec.rb | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/spec/ruby/core/comparable/equal_value_spec.rb b/spec/ruby/core/comparable/equal_value_spec.rb new file mode 100644 index 0000000000..2bc22771b4 --- /dev/null +++ b/spec/ruby/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 |