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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
module ModuleSpecs
class Parent
def method_to_remove; 1; end
end
class First
def method_to_remove; 1; end
end
class Second < First
def method_to_remove; 2; end
end
end
describe "Module#remove_method" do
before :each do
@module = Module.new { def method_to_remove; end }
end
ruby_version_is ''...'2.5' do
it "is a private method" do
Module.should have_private_instance_method(:remove_method, false)
end
end
ruby_version_is '2.5' do
it "is a public method" do
Module.should have_public_instance_method(:remove_method, false)
end
end
it "removes the method from a class" do
klass = Class.new do
def method_to_remove; 1; end
end
x = klass.new
klass.send(:remove_method, :method_to_remove)
x.respond_to?(:method_to_remove).should == false
end
it "removes method from subclass, but not parent" do
child = Class.new(ModuleSpecs::Parent) do
def method_to_remove; 2; end
remove_method :method_to_remove
end
x = child.new
x.respond_to?(:method_to_remove).should == true
x.method_to_remove.should == 1
end
it "removes multiple methods with 1 call" do
klass = Class.new do
def method_to_remove_1; 1; end
def method_to_remove_2; 2; end
remove_method :method_to_remove_1, :method_to_remove_2
end
x = klass.new
x.respond_to?(:method_to_remove_1).should == false
x.respond_to?(:method_to_remove_2).should == false
end
it "accepts multiple arguments" do
Module.instance_method(:remove_method).arity.should < 0
end
it "does not remove any instance methods when argument not given" do
before = @module.instance_methods(true) + @module.private_instance_methods(true)
@module.send :remove_method
after = @module.instance_methods(true) + @module.private_instance_methods(true)
before.sort.should == after.sort
end
it "returns self" do
@module.send(:remove_method, :method_to_remove).should equal(@module)
end
it "raises a NameError when attempting to remove method further up the inheritance tree" do
lambda {
class Third < ModuleSpecs::Second
remove_method :method_to_remove
end
}.should raise_error(NameError)
end
it "raises a NameError when attempting to remove a missing method" do
lambda {
class Third < ModuleSpecs::Second
remove_method :blah
end
}.should raise_error(NameError)
end
describe "on frozen instance" do
before :each do
@frozen = @module.dup.freeze
end
it "raises a RuntimeError when passed a name" do
lambda { @frozen.send :remove_method, :method_to_remove }.should raise_error(RuntimeError)
end
it "raises a RuntimeError when passed a missing name" do
lambda { @frozen.send :remove_method, :not_exist }.should raise_error(RuntimeError)
end
it "raises a TypeError when passed a not name" do
lambda { @frozen.send :remove_method, Object.new }.should raise_error(TypeError)
end
it "does not raise exceptions when no arguments given" do
@frozen.send(:remove_method).should equal(@frozen)
end
end
end
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