require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "Comparable#>" do
  it "calls #<=> on self with other and returns true if #<=> returns any Integer greater 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 less 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)
    lambda { (a > b) }.should raise_error(ArgumentError)
  end
end