ruby--ruby/spec/ruby/core/module/lt_spec.rb

require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Module#<" do
  it "returns true if self is a subclass of or includes the given module" do
    (ModuleSpecs::Child < ModuleSpecs::Parent).should == true
    (ModuleSpecs::Child < ModuleSpecs::Basic).should == true
    (ModuleSpecs::Child < ModuleSpecs::Super).should == true
    (ModuleSpecs::Super < ModuleSpecs::Basic).should == true
  end

  it "returns false if self is a superclass of or included by the given module" do
    (ModuleSpecs::Parent < ModuleSpecs::Child).should be_false
    (ModuleSpecs::Basic < ModuleSpecs::Child).should be_false
    (ModuleSpecs::Super < ModuleSpecs::Child).should be_false
    (ModuleSpecs::Basic < ModuleSpecs::Super).should be_false
  end

  it "returns false if self is the same as the given module" do
    (ModuleSpecs::Child  < ModuleSpecs::Child).should == false
    (ModuleSpecs::Parent < ModuleSpecs::Parent).should == false
    (ModuleSpecs::Basic  < ModuleSpecs::Basic).should == false
    (ModuleSpecs::Super  < ModuleSpecs::Super).should == false
  end

  it "returns nil if self is not related to the given module" do
    (ModuleSpecs::Parent < ModuleSpecs::Basic).should == nil
    (ModuleSpecs::Parent < ModuleSpecs::Super).should == nil
    (ModuleSpecs::Basic  < ModuleSpecs::Parent).should == nil
    (ModuleSpecs::Super  < ModuleSpecs::Parent).should == nil
  end

  it "raises a TypeError if the argument is not a class/module" do
    -> { ModuleSpecs::Parent < mock('x') }.should raise_error(TypeError)
  end
end