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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
module KernelSpecs::M
def self.extend_object(o)
ScratchPad << "extend_object"
super
end
def self.extended(o)
ScratchPad << "extended"
super
end
def self.append_features(o)
ScratchPad << "append_features"
super
end
end
describe "Kernel#extend" do
before :each do
ScratchPad.record []
end
it "requires multiple arguments" do
Object.new.method(:extend).arity.should < 0
end
it "calls extend_object on argument" do
o = mock('o')
o.extend KernelSpecs::M
ScratchPad.recorded.include?("extend_object").should == true
end
it "does not calls append_features on arguments metaclass" do
o = mock('o')
o.extend KernelSpecs::M
ScratchPad.recorded.include?("append_features").should == false
end
it "calls extended on argument" do
o = mock('o')
o.extend KernelSpecs::M
ScratchPad.recorded.include?("extended").should == true
end
it "makes the class a kind_of? the argument" do
class C
extend KernelSpecs::M
end
(C.kind_of? KernelSpecs::M).should == true
end
it "raises an ArgumentError when no arguments given" do
lambda { Object.new.extend }.should raise_error(ArgumentError)
end
it "raises a TypeError when the argument is not a Module" do
o = mock('o')
klass = Class.new
lambda { o.extend(klass) }.should raise_error(TypeError)
end
describe "on frozen instance" do
before :each do
@frozen = Object.new.freeze
@module = KernelSpecs::M
end
it "raises an ArgumentError when no arguments given" do
lambda { @frozen.extend }.should raise_error(ArgumentError)
end
it "raises a #{frozen_error_class}" do
lambda { @frozen.extend @module }.should raise_error(frozen_error_class)
end
end
end
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