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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
context "Creating UnboundMethods" do
specify "there is no difference between Method#unbind and Module#instance_method" do
UnboundMethodSpecs::Methods.instance_method(:foo).should be_kind_of(UnboundMethod)
UnboundMethodSpecs::Methods.new.method(:foo).unbind.should be_kind_of(UnboundMethod)
end
end
describe "UnboundMethod#==" do
before :all do
@from_module = UnboundMethodSpecs::Methods.instance_method(:foo)
@from_unbind = UnboundMethodSpecs::Methods.new.method(:foo).unbind
@with_block = UnboundMethodSpecs::Methods.instance_method(:with_block)
@includee = UnboundMethodSpecs::Mod.instance_method(:from_mod)
@includer = UnboundMethodSpecs::Methods.instance_method(:from_mod)
@alias_1 = UnboundMethodSpecs::Methods.instance_method(:alias_1)
@alias_2 = UnboundMethodSpecs::Methods.instance_method(:alias_2)
@original_body = UnboundMethodSpecs::Methods.instance_method(:original_body)
@identical_body = UnboundMethodSpecs::Methods.instance_method(:identical_body)
@parent = UnboundMethodSpecs::Parent.instance_method(:foo)
@child1 = UnboundMethodSpecs::Child1.instance_method(:foo)
@child2 = UnboundMethodSpecs::Child2.instance_method(:foo)
@child1_alt = UnboundMethodSpecs::Child1.instance_method(:foo)
@discard_1 = UnboundMethodSpecs::Methods.instance_method(:discard_1)
@discard_2 = UnboundMethodSpecs::Methods.instance_method(:discard_2)
@method_one = UnboundMethodSpecs::Methods.instance_method(:one)
@method_two = UnboundMethodSpecs::Methods.instance_method(:two)
end
it "returns true if objects refer to the same method" do
(@from_module == @from_module).should == true
(@from_unbind == @from_unbind).should == true
(@from_module == @from_unbind).should == true
(@from_unbind == @from_module).should == true
(@with_block == @with_block).should == true
end
it "returns true if either is an alias for the other" do
(@from_module == @alias_1).should == true
(@alias_1 == @from_module).should == true
end
it "returns true if both are aliases for a third method" do
(@from_module == @alias_1).should == true
(@alias_1 == @from_module).should == true
(@from_module == @alias_2).should == true
(@alias_2 == @from_module).should == true
(@alias_1 == @alias_2).should == true
(@alias_2 == @alias_1).should == true
end
it "returns true if same method is extracted from the same subclass" do
(@child1 == @child1_alt).should == true
(@child1_alt == @child1).should == true
end
it "returns false if UnboundMethods are different methods" do
(@method_one == @method_two).should == false
(@method_two == @method_one).should == false
end
it "returns false if both have identical body but are not the same" do
(@original_body == @identical_body).should == false
(@identical_body == @original_body).should == false
end
it "returns false if same method but one extracted from a subclass" do
(@parent == @child1).should == false
(@child1 == @parent).should == false
end
it "returns false if same method but extracted from two different subclasses" do
(@child2 == @child1).should == false
(@child1 == @child2).should == false
end
it "returns false if methods are the same but added from an included Module" do
(@includee == @includer).should == false
(@includer == @includee).should == false
end
it "returns false if both have same Module, same name, identical body but not the same" do
class UnboundMethodSpecs::Methods
def discard_1; :discard; end
end
(@discard_1 == UnboundMethodSpecs::Methods.instance_method(:discard_1)).should == false
end
it "considers methods through aliasing equal" do
c = Class.new do
class << self
alias_method :n, :new
end
end
c.method(:new).should == c.method(:n)
c.method(:n).should == Class.instance_method(:new).bind(c)
end
# On CRuby < 3.2, the 2 specs below pass due to method/instance_method skipping zsuper methods.
# We are interested in the general pattern working, i.e. the combination of method/instance_method
# and #== exposes the wanted behavior.
it "considers methods through visibility change equal" do
c = Class.new do
class << self
private :new
end
end
c.method(:new).should == Class.instance_method(:new).bind(c)
end
it "considers methods through aliasing and visibility change equal" do
c = Class.new do
class << self
alias_method :n, :new
private :new
end
end
c.method(:new).should == c.method(:n)
c.method(:n).should == Class.instance_method(:new).bind(c)
c.method(:new).should == Class.instance_method(:new).bind(c)
end
end
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