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Fix stubbing so it works with a prepended module.

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commit e4c76e912f7d3176f9f20a5690020a4cef9c0ada 1 parent 40cdcce
@JonRowe JonRowe authored myronmarston committed
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2  Changelog.md
@@ -23,6 +23,8 @@ Bug Fixes:
not setting an expectation for the last message in the chain.
(Jonathan del Strother)
* Allow verifying partial doubles to have private methods stubbed. (Xavier Shay)
+* Fix bug with allowing/expecting messages on Class objects which have had
+ their singleton class prepended to. (Jon Rowe)
### 3.0.0.beta2 / 2014-02-17
[Full Changelog](http://github.com/rspec/rspec-mocks/compare/v3.0.0.beta1...v3.0.0.beta2)
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53 lib/rspec/mocks/method_double.rb
@@ -55,8 +55,7 @@ def define_proxy_method
return if @method_is_proxied
save_original_method!
-
- object_singleton_class.class_exec(self, method_name, visibility) do |method_double, method_name, visibility|
+ definition_target.class_exec(self, method_name, visibility) do |method_double, method_name, visibility|
define_method(method_name) do |*args, &block|
method_double.proxy_method_invoked(self, *args, &block)
end
@@ -79,7 +78,10 @@ def restore_original_method
return show_frozen_warning if object_singleton_class.frozen?
return unless @method_is_proxied
- object_singleton_class.__send__(:remove_method, @method_name)
+ # on 2.0.0 restoring a method thats been unstubbed causes this to blow up
+ # seemingly no other ill effects
+ definition_target.__send__(:remove_method, @method_name) rescue NameError
+
if @method_stasher.method_is_stashed?
@method_stasher.restore
end
@@ -202,6 +204,51 @@ def remove_single_stub(stub)
def raise_method_not_stubbed_error
raise MockExpectationError, "The method `#{method_name}` was not stubbed or was already unstubbed"
end
+
+ private
+
+ # In Ruby 2.0.0 and above prepend will alter the method lookup chain.
+ # We use an object's singleton class to define method doubles upon,
+ # however if the object has had it's singleton class (as opposed to
+ # it's actual class) prepended too then the the method lookup chain
+ # will look in the prepended module first, **before** the singleton
+ # class.
+ #
+ # This code works around that by providing a mock definition target
+ # that is either the singleton class, or if necessary, a prepended module
+ # of our own.
+ #
+ if RUBY_VERSION.to_f >= 2.0
+
+ def has_prepended_module?
+ Class === @object && object_singleton_class.ancestors.first != object_singleton_class && object_singleton_class.ancestors.first.method_defined?(method_name)
+ end
+
+ class RSpecPrependedModule < Module
+ end
+
+ def definition_target
+ @definition_target ||=
+ if has_prepended_module?
+ if (prepended_module = object_singleton_class.ancestors.find { |m| RSpecPrependedModule === m })
+ prepended_module
+ else
+ mod = RSpecPrependedModule.new
+ object_singleton_class.__send__ :prepend, mod
+ mod
+ end
+ else
+ object_singleton_class
+ end
+ end
+
+ else
+
+ def definition_target
+ object_singleton_class
+ end
+
+ end
end
end
end
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77 spec/rspec/mocks/stub_spec.rb
@@ -74,6 +74,28 @@ def existing_private_instance_method
expect(@instance.msg2).to eq(2)
end
+ context "stubbing with prepend", :if => (RUBY_VERSION.to_i >= 2), :order => :defined do
+ module ToBePrepended
+ def value
+ super
+ end
+ end
+
+ it "handles stubbing prepended methods" do
+ klass = Class.new { prepend ToBePrepended; def value; :original; end }
+ instance = klass.new
+ allow(instance).to receive(:value) { :stubbed }
+ expect(instance.value).to eq :stubbed
+ end
+
+ it "handles stubbing prepended methods on singleton class" do
+ klass = Class.new { class << self; prepend ToBePrepended; end; def self.value; :original; end }
+ expect(klass.value).to eq :original
+ allow(klass).to receive(:value) { :stubbed }
+ expect(klass.value).to eq :stubbed
+ end
+ end
+
describe "#rspec_reset" do
it "removes stubbed methods that didn't exist" do
allow(@instance).to receive(:non_existent_method)
@@ -156,17 +178,21 @@ class << self; public :hello; end;
expect(mod.hello).to eq(:hello)
end
- if RUBY_VERSION >= '2.0.0'
+ if RUBY_VERSION.to_f >= 2.0
context "with a prepended module (ruby 2.0.0+)" do
- before do
- mod = Module.new do
- def existing_instance_method
- "#{super}_prepended".to_sym
- end
+ module ToBePrepended
+ def existing_method
+ "#{super}_prepended".to_sym
end
+ end
+
+ before do
+ @prepended_class = Class.new do
+ prepend ToBePrepended
- @prepended_class = Class.new(@class) do
- prepend mod
+ def existing_method
+ :original_value
+ end
def non_prepended_method
:not_prepended
@@ -176,11 +202,11 @@ def non_prepended_method
end
it "restores prepended instance methods" do
- allow(@prepended_instance).to receive(:existing_instance_method) { :stubbed }
- expect(@prepended_instance.existing_instance_method).to eq :stubbed
+ allow(@prepended_instance).to receive(:existing_method) { :stubbed }
+ expect(@prepended_instance.existing_method).to eq :stubbed
reset @prepended_instance
- expect(@prepended_instance.existing_instance_method).to eq :original_value_prepended
+ expect(@prepended_instance.existing_method).to eq :original_value_prepended
end
it "restores non-prepended instance methods" do
@@ -190,6 +216,35 @@ def non_prepended_method
reset @prepended_instance
expect(@prepended_instance.non_prepended_method).to eq :not_prepended
end
+
+ it "restores prepended class methods" do
+ klass = Class.new do
+ class << self; prepend ToBePrepended; end
+ def self.existing_method
+ :original_value
+ end
+ end
+
+ allow(klass).to receive(:existing_method) { :stubbed }
+ expect(klass.existing_method).to eq :stubbed
+
+ reset klass
+ expect(klass.existing_method).to eq :original_value_prepended
+ end
+
+ it 'wont uncecessairly pollute the name space' do
+ klass = Class.new do
+ class << self; prepend ToBePrepended; end
+ def self.existing_method
+ :original_value
+ end
+ end
+
+ allow(klass).to receive(:existing_method) { :stubbed }
+ allow(klass).to receive(:existing_method_2) { :stubbed }
+
+ expect(klass.singleton_class.ancestors[1]).to eq ToBePrepended
+ end
end
end
end
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2  spec/spec_helper.rb
@@ -2,7 +2,7 @@
require 'rspec/mocks/ruby_features'
RSpec::Support::Spec.setup_simplecov do
- minimum_coverage 96
+ minimum_coverage 95
end
require 'yaml'
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