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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
it "raises an ArgumentError" do
lambda { (a == b) }.should raise_error(ArgumentError)
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
it "lets it go through" do
lambda { (a == b) }.should raise_error(StandardError)
end
end
context "if it is a subclass of StandardError" do
# TypeError < StandardError
before :each do
a.should_receive(:<=>).once.and_raise(TypeError)
end
it "lets it go through" do
lambda { (a == b) }.should raise_error(TypeError)
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
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