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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Refinement#import_methods" do
context "when methods are defined in Ruby code" do
it "imports methods" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
Module.new do
refine String do
import_methods str_utils
"foo".indent(3).should == " foo"
end
end
end
it "throws an exception when argument is not a module" do
Module.new do
refine String do
-> {
import_methods Integer
}.should raise_error(TypeError, "wrong argument type Class (expected Module)")
end
end
end
it "imports methods from multiple modules" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
str_utils_fancy = Module.new do
def indent_star(level)
"*" * level + self
end
end
Module.new do
refine String do
import_methods str_utils, str_utils_fancy
"foo".indent(3).should == " foo"
"foo".indent_star(3).should == "***foo"
end
end
end
it "imports a method defined in the last module if method with same name is defined in multiple modules" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
str_utils_fancy = Module.new do
def indent(level)
"*" * level + self
end
end
Module.new do
refine String do
import_methods str_utils, str_utils_fancy
"foo".indent(3).should == "***foo"
end
end
end
it "still imports methods of modules listed before a module that contains method not defined in Ruby" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
string_refined = Module.new do
refine String do
-> {
import_methods str_utils, Kernel
}.should raise_error(ArgumentError)
end
end
Module.new do
using string_refined
"foo".indent(3).should == " foo"
end
end
end
it "warns if a module includes/prepends some other module" do
module1 = Module.new do
end
module2 = Module.new do
include module1
end
Module.new do
refine String do
-> {
import_methods module2
}.should complain(/warning: #<Module:\w*> has ancestors, but Refinement#import_methods doesn't import their methods/)
end
end
Module.new do
refine String do
-> {
import_methods RefinementSpec::ModuleWithAncestors
}.should complain(/warning: RefinementSpec::ModuleWithAncestors has ancestors, but Refinement#import_methods doesn't import their methods/)
end
end
end
it "doesn't import methods from included/prepended modules" do
Module.new do
refine String do
suppress_warning { import_methods RefinementSpec::ModuleWithAncestors }
end
using self
-> {
"foo".indent(3)
}.should raise_error(NoMethodError, /undefined method [`']indent' for ("foo":String|an instance of String)/)
end
end
it "doesn't import any methods if one of the arguments is not a module" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
string_refined = Module.new do
refine String do
-> {
import_methods str_utils, Integer
}.should raise_error(TypeError)
end
end
Module.new do
using string_refined
-> {
"foo".indent(3)
}.should raise_error(NoMethodError)
end
end
it "imports methods from multiple modules so that methods see other's module's methods" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
end
str_utils_normal = Module.new do
def indent_normal(level)
self.indent(level)
end
end
Module.new do
refine String do
import_methods str_utils, str_utils_normal
end
using self
"foo".indent_normal(3).should == " foo"
end
end
it "imports methods from module so that methods can see each other" do
str_utils = Module.new do
def indent(level)
" " * level + self
end
def indent_with_dot(level)
self.indent(level) + "."
end
end
Module.new do
refine String do
import_methods str_utils
end
using self
"foo".indent_with_dot(3).should == " foo."
end
end
it "doesn't import module's class methods" do
str_utils = Module.new do
def self.indent(level)
" " * level + self
end
end
Module.new do
refine String do
import_methods str_utils
end
using self
-> {
String.indent(3)
}.should raise_error(NoMethodError, /undefined method [`']indent' for (String:Class|class String)/)
end
end
it "imports module methods with super" do
class_to_refine = Class.new do
def foo(number)
2 * number
end
end
extension = Module.new do
def foo(number)
super * 2
end
end
refinement = Module.new do
refine class_to_refine do
import_methods extension
end
end
Module.new do
using refinement
class_to_refine.new.foo(2).should == 8
end
end
context "when methods are not defined in Ruby code" do
it "raises ArgumentError" do
Module.new do
refine String do
-> {
import_methods Kernel
}.should raise_error(ArgumentError)
end
end
end
it "raises ArgumentError when importing methods from C extension" do
require 'zlib'
Module.new do
refine String do
-> {
import_methods Zlib
}.should raise_error(ArgumentError, /Can't import method which is not defined with Ruby code: Zlib#*/)
end
end
end
end
end
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