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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
module ModuleSpecs
class Parent
def method_to_undef() 1 end
def another_method_to_undef() 1 end
end
class Ancestor
def method_to_undef() 1 end
def another_method_to_undef() 1 end
end
end
describe "Module#undef_method" do
before :each do
@module = Module.new { def method_to_undef; end }
end
it "is a public method" do
Module.should have_public_instance_method(:undef_method, false)
end
it "requires multiple arguments" do
Module.instance_method(:undef_method).arity.should < 0
end
it "allows multiple methods to be removed at once" do
klass = Class.new do
def method_to_undef() 1 end
def another_method_to_undef() 1 end
end
x = klass.new
klass.send(:undef_method, :method_to_undef, :another_method_to_undef)
-> { x.method_to_undef }.should raise_error(NoMethodError)
-> { x.another_method_to_undef }.should raise_error(NoMethodError)
end
it "does not undef any instance methods when argument not given" do
before = @module.instance_methods(true) + @module.private_instance_methods(true)
@module.send :undef_method
after = @module.instance_methods(true) + @module.private_instance_methods(true)
before.sort.should == after.sort
end
it "returns self" do
@module.send(:undef_method, :method_to_undef).should equal(@module)
end
it "raises a NameError when passed a missing name for a module" do
-> { @module.send :undef_method, :not_exist }.should raise_error(NameError, /undefined method `not_exist' for module `#{@module}'/) { |e|
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
it "raises a NameError when passed a missing name for a class" do
klass = Class.new
-> { klass.send :undef_method, :not_exist }.should raise_error(NameError, /undefined method `not_exist' for class `#{klass}'/) { |e|
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
it "raises a NameError when passed a missing name for a singleton class" do
klass = Class.new
obj = klass.new
sclass = obj.singleton_class
-> { sclass.send :undef_method, :not_exist }.should raise_error(NameError, /undefined method `not_exist' for class `#{sclass}'/) { |e|
e.message.should include('`#<Class:#<#<Class:')
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
it "raises a NameError when passed a missing name for a metaclass" do
klass = String.singleton_class
-> { klass.send :undef_method, :not_exist }.should raise_error(NameError, /undefined method `not_exist' for class `String'/) { |e|
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
describe "on frozen instance" do
before :each do
@frozen = @module.dup.freeze
end
it "raises a FrozenError when passed a name" do
-> { @frozen.send :undef_method, :method_to_undef }.should raise_error(FrozenError)
end
it "raises a FrozenError when passed a missing name" do
-> { @frozen.send :undef_method, :not_exist }.should raise_error(FrozenError)
end
it "raises a TypeError when passed a not name" do
-> { @frozen.send :undef_method, Object.new }.should raise_error(TypeError)
end
it "does not raise exceptions when no arguments given" do
@frozen.send(:undef_method).should equal(@frozen)
end
end
end
describe "Module#undef_method with symbol" do
it "removes a method defined in a class" do
klass = Class.new do
def method_to_undef() 1 end
def another_method_to_undef() 1 end
end
x = klass.new
x.method_to_undef.should == 1
klass.send :undef_method, :method_to_undef
-> { x.method_to_undef }.should raise_error(NoMethodError)
end
it "removes a method defined in a super class" do
child_class = Class.new(ModuleSpecs::Parent)
child = child_class.new
child.method_to_undef.should == 1
child_class.send :undef_method, :method_to_undef
-> { child.method_to_undef }.should raise_error(NoMethodError)
end
it "does not remove a method defined in a super class when removed from a subclass" do
descendant = Class.new(ModuleSpecs::Ancestor)
ancestor = ModuleSpecs::Ancestor.new
ancestor.method_to_undef.should == 1
descendant.send :undef_method, :method_to_undef
ancestor.method_to_undef.should == 1
end
end
describe "Module#undef_method with string" do
it "removes a method defined in a class" do
klass = Class.new do
def method_to_undef() 1 end
def another_method_to_undef() 1 end
end
x = klass.new
x.another_method_to_undef.should == 1
klass.send :undef_method, 'another_method_to_undef'
-> { x.another_method_to_undef }.should raise_error(NoMethodError)
end
it "removes a method defined in a super class" do
child_class = Class.new(ModuleSpecs::Parent)
child = child_class.new
child.another_method_to_undef.should == 1
child_class.send :undef_method, 'another_method_to_undef'
-> { child.another_method_to_undef }.should raise_error(NoMethodError)
end
it "does not remove a method defined in a super class when removed from a subclass" do
descendant = Class.new(ModuleSpecs::Ancestor)
ancestor = ModuleSpecs::Ancestor.new
ancestor.another_method_to_undef.should == 1
descendant.send :undef_method, 'another_method_to_undef'
ancestor.another_method_to_undef.should == 1
end
end
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