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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
190 lines
4.7 KiB
Ruby
190 lines
4.7 KiB
Ruby
require File.expand_path('../../spec_helper', __FILE__)
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class AliasObject
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attr :foo
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attr_reader :bar
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attr_accessor :baz
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def prep; @foo = 3; @bar = 4; end
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def value; 5; end
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def false_value; 6; end
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def self.klass_method; 7; end
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end
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describe "The alias keyword" do
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before :each do
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@obj = AliasObject.new
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@meta = class << @obj;self;end
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end
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it "creates a new name for an existing method" do
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@meta.class_eval do
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alias __value value
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end
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@obj.__value.should == 5
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end
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it "adds the new method to the list of methods" do
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original_methods = @obj.methods
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@meta.class_eval do
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alias __value value
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end
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(@obj.methods - original_methods).map {|m| m.to_s }.should == ["__value"]
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end
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it "adds the new method to the list of public methods" do
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original_methods = @obj.public_methods
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@meta.class_eval do
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alias __value value
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end
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(@obj.public_methods - original_methods).map {|m| m.to_s }.should == ["__value"]
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end
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it "overwrites an existing method with the target name" do
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@meta.class_eval do
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alias false_value value
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end
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@obj.false_value.should == 5
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end
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it "is reversible" do
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@meta.class_eval do
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alias __value value
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alias value false_value
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end
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@obj.value.should == 6
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@meta.class_eval do
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alias value __value
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end
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@obj.value.should == 5
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end
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it "operates on the object's metaclass when used in instance_eval" do
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@obj.instance_eval do
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alias __value value
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end
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@obj.__value.should == 5
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lambda { AliasObject.new.__value }.should raise_error(NoMethodError)
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end
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it "operates on the class/module metaclass when used in instance_eval" do
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AliasObject.instance_eval do
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alias __klass_method klass_method
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end
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AliasObject.__klass_method.should == 7
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lambda { Object.__klass_method }.should raise_error(NoMethodError)
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end
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it "operates on the class/module metaclass when used in instance_exec" do
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AliasObject.instance_exec do
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alias __klass_method2 klass_method
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end
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AliasObject.__klass_method2.should == 7
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lambda { Object.__klass_method2 }.should raise_error(NoMethodError)
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end
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it "operates on methods defined via attr, attr_reader, and attr_accessor" do
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@obj.prep
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@obj.instance_eval do
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alias afoo foo
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alias abar bar
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alias abaz baz
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end
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@obj.afoo.should == 3
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@obj.abar.should == 4
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@obj.baz = 5
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@obj.abaz.should == 5
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end
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it "operates on methods with splat arguments" do
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class AliasObject2;end
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AliasObject2.class_eval do
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def test(*args)
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4
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end
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def test_with_check(*args)
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test_without_check(*args)
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end
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alias test_without_check test
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alias test test_with_check
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end
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AliasObject2.new.test(1,2,3,4,5).should == 4
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end
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it "operates on methods with splat arguments on eigenclasses" do
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@meta.class_eval do
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def test(*args)
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4
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end
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def test_with_check(*args)
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test_without_check(*args)
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end
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alias test_without_check test
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alias test test_with_check
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end
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@obj.test(1,2,3,4,5).should == 4
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end
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it "operates on methods with splat arguments defined in a superclass" do
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alias_class = Class.new
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alias_class.class_eval do
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def test(*args)
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4
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end
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def test_with_check(*args)
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test_without_check(*args)
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end
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end
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sub = Class.new(alias_class) do
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alias test_without_check test
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alias test test_with_check
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end
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sub.new.test(1,2,3,4,5).should == 4
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end
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it "operates on methods with splat arguments defined in a superclass using text block for class eval" do
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class Sub < AliasObject;end
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AliasObject.class_eval <<-code
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def test(*args)
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4
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end
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def test_with_check(*args)
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test_without_check(*args)
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end
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alias test_without_check test
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alias test test_with_check
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code
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Sub.new.test("testing").should == 4
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end
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it "is not allowed against Fixnum or String instances" do
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lambda do
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1.instance_eval do
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alias :foo :to_s
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end
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end.should raise_error(TypeError)
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lambda do
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:blah.instance_eval do
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alias :foo :to_s
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end
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end.should raise_error(TypeError)
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end
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it "on top level defines the alias on Object" do
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# because it defines on the default definee / current module
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ruby_exe("def foo; end; alias bla foo; print method(:bla).owner", escape: true).should == "Object"
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end
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it "raises a NameError when passed a missing name" do
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lambda { @meta.class_eval { alias undef_method not_exist } }.should raise_error(NameError) { |e|
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# a NameError and not a NoMethodError
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e.class.should == NameError
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}
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end
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end
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