File: //usr/local/rvm/src/ruby-2.5.9/spec/ruby/core/module/refine_spec.rb
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/refine', __FILE__)
describe "Module#refine" do
it "runs its block in an anonymous module" do
inner_self = nil
mod = Module.new do
refine String do
inner_self = self
end
end
mod.should_not == inner_self
inner_self.should be_kind_of(Module)
inner_self.name.should == nil
end
it "uses the same anonymous module for future refines of the same class" do
selves = []
mod = Module.new do
refine String do
selves << self
end
end
mod.module_eval do
refine String do
selves << self
end
end
selves[0].should == selves[1]
end
it "adds methods defined in its block to the anonymous module's public instance methods" do
inner_self = nil
mod = Module.new do
refine String do
def blah
"blah"
end
inner_self = self
end
end
inner_self.public_instance_methods.should include(:blah)
end
it "returns created anonymous module" do
inner_self = nil
result = nil
mod = Module.new do
result = refine String do
inner_self = self
end
end
result.should == inner_self
end
it "raises ArgumentError if not passed an argument" do
lambda do
Module.new do
refine {}
end
end.should raise_error(ArgumentError)
end
it "raises TypeError if not passed a class" do
lambda do
Module.new do
refine("foo") {}
end
end.should raise_error(TypeError)
end
ruby_version_is "" ... "2.4" do
it "raises TypeError if passed a module" do
lambda do
Module.new do
refine(Enumerable) {}
end
end.should raise_error(TypeError)
end
end
quarantine! do # https://bugs.ruby-lang.org/issues/14070
ruby_version_is "2.4" do
it "accepts a module as argument" do
inner_self = nil
Module.new do
refine(Enumerable) do
def blah
end
inner_self = self
end
end
inner_self.public_instance_methods.should include(:blah)
end
end
end
it "raises ArgumentError if not given a block" do
lambda do
Module.new do
refine String
end
end.should raise_error(ArgumentError)
end
it "applies refinements to calls in the refine block" do
result = nil
Module.new do
refine(String) do
def foo; "foo"; end
result = "hello".foo
end
end
result.should == "foo"
end
it "doesn't apply refinements outside the refine block" do
Module.new do
refine(String) {def foo; "foo"; end}
-> () {
"hello".foo
}.should raise_error(NoMethodError)
end
end
it "does not apply refinements to external scopes not using the module" do
Module.new do
refine(String) {def foo; 'foo'; end}
end
lambda {"hello".foo}.should raise_error(NoMethodError)
end
# When defining multiple refinements in the same module,
# inside a refine block all refinements from the same
# module are active when a refined method is called
it "makes available all refinements from the same module" do
refinement = Module.new do
refine Integer do
def to_json_format
to_s
end
end
refine Array do
def to_json_format
"[" + map { |i| i.to_json_format }.join(", ") + "]"
end
end
refine Hash do
def to_json_format
"{" + map { |k, v| k.to_s.dump + ": " + v.to_json_format }.join(", ") + "}"
end
end
end
result = nil
Module.new do
using refinement
result = [{1 => 2}, {3 => 4}].to_json_format
end
result.should == '[{"1": 2}, {"3": 4}]'
end
it "does not make available methods from another refinement module" do
refinery_integer = Module.new do
refine Integer do
def to_json_format
to_s
end
end
end
refinery_array = Module.new do
refine Array do
def to_json_format
"[" + map { |i| i.to_json_format }.join(",") + "]"
end
end
end
result = nil
-> () {
Module.new do
using refinery_integer
using refinery_array
[1, 2].to_json_format
end
}.should raise_error(NoMethodError)
end
# method lookup:
# * The prepended modules from the refinement for C
# * The refinement for C
# * The included modules from the refinement for C
# * The prepended modules of C
# * C
# * The included modules of C
describe "method lookup" do
it "looks in the object singleton class first" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
obj = ModuleSpecs::ClassWithFoo.new
class << obj
def foo; "foo from singleton class"; end
end
result = obj.foo
end
result.should == "foo from singleton class"
end
it "looks in prepended modules from the refinement first" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
include ModuleSpecs::IncludedModule
prepend ModuleSpecs::PrependedModule
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo from prepended module"
end
it "looks in refinement then" do
refinement = Module.new do
refine(ModuleSpecs::ClassWithFoo) do
include ModuleSpecs::IncludedModule
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo from refinement"
end
it "looks in included modules from the refinement then" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
include ModuleSpecs::IncludedModule
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo from included module"
end
it "looks in the class then" do
refinement = Module.new do
refine(ModuleSpecs::ClassWithFoo) { }
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo"
end
end
# methods in a subclass have priority over refinements in a superclass
it "does not override methods in subclasses" do
subclass = Class.new(ModuleSpecs::ClassWithFoo) do
def foo; "foo from subclass"; end
end
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = subclass.new.foo
end
result.should == "foo from subclass"
end
context "for methods accessed indirectly" do
ruby_version_is "" ... "2.4" do
it "is not honored by Kernel#send" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.send :foo
end
result.should == "foo"
end
it "is not honored by BasicObject#__send__" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.__send__ :foo
end
result.should == "foo"
end
it "is not honored by Symbol#to_proc" do
refinement = Module.new do
refine Integer do
def to_s
"(#{super})"
end
end
end
result = nil
Module.new do
using refinement
result = [1, 2, 3].map(&:to_s)
end
result.should == ["1", "2", "3"]
end
end
ruby_version_is "2.4" do
it "is honored by Kernel#send" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.send :foo
end
result.should == "foo from refinement"
end
it "is honored by BasicObject#__send__" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo; "foo from refinement"; end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.__send__ :foo
end
result.should == "foo from refinement"
end
it "is honored by Symbol#to_proc" do
refinement = Module.new do
refine Integer do
def to_s
"(#{super})"
end
end
end
result = nil
Module.new do
using refinement
result = [1, 2, 3].map(&:to_s)
end
result.should == ["(1)", "(2)", "(3)"]
end
end
ruby_version_is "" ... "2.5" do
it "is not honored by string interpolation" do
refinement = Module.new do
refine Integer do
def to_s
"foo"
end
end
end
result = nil
Module.new do
using refinement
result = "#{1}"
end
result.should == "1"
end
end
ruby_version_is "2.5" do
it "is honored by string interpolation" do
refinement = Module.new do
refine Integer do
def to_s
"foo"
end
end
end
result = nil
Module.new do
using refinement
result = "#{1}"
end
result.should == "foo"
end
end
it "is honored by Kernel#binding" do
refinement = Module.new do
refine String do
def to_s
"hello from refinement"
end
end
end
klass = Class.new do
using refinement
def foo
"foo".to_s
end
def get_binding
binding
end
end
result = Kernel.eval("self.foo()", klass.new.get_binding)
result.should == "hello from refinement"
end
it "is not honored by Kernel#method" do
klass = Class.new
refinement = Module.new do
refine klass do
def foo; end
end
end
-> {
Module.new do
using refinement
klass.new.method(:foo)
end
}.should raise_error(NameError, /undefined method `foo'/)
end
it "is not honored by Kernel#respond_to?" do
klass = Class.new
refinement = Module.new do
refine klass do
def foo; end
end
end
result = nil
Module.new do
using refinement
result = klass.new.respond_to?(:foo)
end
result.should == false
end
end
context "when super is called in a refinement" do
it "looks in the included to refinery module" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
include ModuleSpecs::IncludedModule
def foo
super
end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo from included module"
end
it "looks in the refined class" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo
super
end
end
end
result = nil
Module.new do
using refinement
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo"
end
# super in a method of a refinement invokes the method in the refined
# class even if there is another refinement which has been activated
# in the same context.
it "looks in the refined class even if there is another active refinement" do
refinement = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo
"foo from refinement"
end
end
end
refinement_with_super = Module.new do
refine ModuleSpecs::ClassWithFoo do
def foo
super
end
end
end
result = nil
Module.new do
using refinement
using refinement_with_super
result = ModuleSpecs::ClassWithFoo.new.foo
end
result.should == "foo"
end
end
# Refinements are inherited by module inclusion.
# That is, using activates all refinements in the ancestors of the specified module.
# Refinements in a descendant have priority over refinements in an ancestor.
context "module inclusion" do
it "activates all refinements from all ancestors" do
refinement_included = Module.new do
refine Integer do
def to_json_format
to_s
end
end
end
refinement = Module.new do
include refinement_included
refine Array do
def to_json_format
"[" + map { |i| i.to_s }.join(", ") + "]"
end
end
end
result = nil
Module.new do
using refinement
result = [5.to_json_format, [1, 2, 3].to_json_format]
end
result.should == ["5", "[1, 2, 3]"]
end
it "overrides methods of ancestors by methods in descendants" do
refinement_included = Module.new do
refine Integer do
def to_json_format
to_s
end
end
end
refinement = Module.new do
include refinement_included
refine Integer do
def to_json_format
"hello from refinement"
end
end
end
result = nil
Module.new do
using refinement
result = 5.to_json_format
end
result.should == "hello from refinement"
end
end
end