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require File.expand_path('../../../spec_helper', __FILE__)
module ObjectSpecs
module SomeOtherModule; end
module AncestorModule; end
module MyModule; end
class AncestorClass < String
include AncestorModule
end
class InstanceClass < AncestorClass
include MyModule
end
end
describe Object, "#instance_of?" do
before(:each) do
@o = ObjectSpecs::InstanceClass.new
end
it "returns true if given class is object's class" do
@o.instance_of?(ObjectSpecs::InstanceClass).should == true
[].instance_of?(Array).should == true
''.instance_of?(String).should == true
end
it "returns false if given class is object's ancestor class" do
@o.instance_of?(ObjectSpecs::AncestorClass).should == false
end
it "returns false if given class is not object's class nor object's ancestor class" do
@o.instance_of?(Array).should == false
end
it "returns false if given a Module that is included in object's class" do
@o.instance_of?(ObjectSpecs::MyModule).should == false
end
it "returns false if given a Module that is included one of object's ancestors only" do
@o.instance_of?(ObjectSpecs::AncestorModule).should == false
end
it "returns false if given a Module that is not included in object's class" do
@o.instance_of?(ObjectSpecs::SomeOtherModule).should == false
end
it "raises a TypeError if given an object that is not a Class nor a Module" do
lambda { @o.instance_of?(Object.new) }.should raise_error(TypeError)
lambda { @o.instance_of?('ObjectSpecs::InstanceClass') }.should raise_error(TypeError)
lambda { @o.instance_of?(1) }.should raise_error(TypeError)
end
end
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