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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Comparable#<" do
it "calls #<=> on self with other and returns true if #<=> returns any Integer less than 0" do
a = ComparableSpecs::Weird.new(0)
b = ComparableSpecs::Weird.new(20)
a.should_receive(:<=>).any_number_of_times.and_return(-1)
(a < b).should == true
a.should_receive(:<=>).any_number_of_times.and_return(-0.1)
(a < b).should == true
a.should_receive(:<=>).any_number_of_times.and_return(-10000000)
(a < b).should == true
end
it "returns false if calling #<=> on self returns 0 or any Integer greater than 0" do
a = ComparableSpecs::Weird.new(0)
b = ComparableSpecs::Weird.new(10)
a.should_receive(:<=>).any_number_of_times.and_return(0)
(a < b).should == false
a.should_receive(:<=>).any_number_of_times.and_return(0.0)
(a < b).should == false
a.should_receive(:<=>).any_number_of_times.and_return(1.0)
(a < b).should == false
a.should_receive(:<=>).any_number_of_times.and_return(10000000)
(a < b).should == false
end
it "raises an ArgumentError if calling #<=> on self returns nil" do
a = ComparableSpecs::Weird.new(0)
b = ComparableSpecs::Weird.new(20)
a.should_receive(:<=>).any_number_of_times.and_return(nil)
-> { (a < b) }.should raise_error(ArgumentError)
end
it "raises an argument error with a message containing the value" do
-> { ("foo" < 7) }.should raise_error(ArgumentError) { |e|
e.message.should == "comparison of String with 7 failed"
}
end
end
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