825 lines
26 KiB
Ruby
Executable File
825 lines
26 KiB
Ruby
Executable File
require 'spec_helper'
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require 'support/shared_examples/view_helpers'
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module Draper
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describe Decorator do
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it_behaves_like "view helpers", Decorator.new(Model.new)
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describe "#initialize" do
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describe "options validation" do
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it "does not raise error on valid options" do
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valid_options = {context: {}}
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expect{Decorator.new(Model.new, valid_options)}.not_to raise_error
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end
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it "raises error on invalid options" do
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expect{Decorator.new(Model.new, foo: "bar")}.to raise_error ArgumentError, /Unknown key/
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end
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end
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it "sets the object" do
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object = Model.new
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decorator = Decorator.new(object)
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expect(decorator.object).to be object
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end
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it "stores context" do
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context = {some: "context"}
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decorator = Decorator.new(Model.new, context: context)
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expect(decorator.context).to be context
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end
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context "when decorating an instance of itself" do
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it "applies to the object instead" do
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object = Model.new
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decorated = Decorator.new(object)
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redecorated = Decorator.new(decorated)
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expect(redecorated.object).to be object
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end
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context "with context" do
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it "overwrites existing context" do
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decorated = Decorator.new(Model.new, context: {some: "context"})
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new_context = {other: "context"}
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redecorated = Decorator.new(decorated, context: new_context)
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expect(redecorated.context).to be new_context
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end
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end
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context "without context" do
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it "preserves existing context" do
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old_context = {some: "context"}
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decorated = Decorator.new(Model.new, context: old_context)
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redecorated = Decorator.new(decorated)
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expect(redecorated.context).to be old_context
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end
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end
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end
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it "decorates other decorators" do
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decorated = OtherDecorator.new(Model.new)
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redecorated = Decorator.new(decorated)
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expect(redecorated.object).to be decorated
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end
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context "when it has been applied previously" do
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it "warns" do
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decorated = OtherDecorator.new(Decorator.new(Model.new))
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warning_message = nil
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allow_any_instance_of(Object).to receive(:warn) { |instance, message| warning_message = message }
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expect{Decorator.new(decorated)}.to change{warning_message}
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expect(warning_message).to start_with "Reapplying Draper::Decorator"
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expect(warning_message).to include caller(1).first
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end
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it "decorates anyway" do
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decorated = OtherDecorator.new(Decorator.new(Model.new))
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allow_any_instance_of(Object).to receive(:warn)
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redecorated = Decorator.decorate(decorated)
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expect(redecorated.object).to be decorated
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end
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end
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end
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describe "#context=" do
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it "modifies the context" do
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decorator = Decorator.new(Model.new, context: {some: "context"})
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new_context = {other: "context"}
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decorator.context = new_context
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expect(decorator.context).to be new_context
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end
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end
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describe ".decorate_collection" do
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describe "options validation" do
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before { allow(CollectionDecorator).to receive(:new) }
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it "does not raise error on valid options" do
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valid_options = {with: OtherDecorator, context: {}}
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expect{Decorator.decorate_collection([], valid_options)}.not_to raise_error
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end
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it "raises error on invalid options" do
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expect{Decorator.decorate_collection([], foo: "bar")}.to raise_error ArgumentError, /Unknown key/
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end
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end
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context "without a custom collection decorator" do
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it "creates a CollectionDecorator using itself for each item" do
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object = [Model.new]
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expect(CollectionDecorator).to receive(:new).with(object, with: Decorator)
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Decorator.decorate_collection(object)
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end
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it "passes options to the collection decorator" do
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options = {with: OtherDecorator, context: {some: "context"}}
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expect(CollectionDecorator).to receive(:new).with([], options)
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Decorator.decorate_collection([], options)
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end
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end
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context "with a custom collection decorator" do
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it "creates a custom collection decorator using itself for each item" do
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object = [Model.new]
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expect(ProductsDecorator).to receive(:new).with(object, with: ProductDecorator)
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ProductDecorator.decorate_collection(object)
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end
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it "passes options to the collection decorator" do
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options = {with: OtherDecorator, context: {some: "context"}}
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expect(ProductsDecorator).to receive(:new).with([], options)
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ProductDecorator.decorate_collection([], options)
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end
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end
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context "when a NameError is thrown" do
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it "re-raises that error" do
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allow_any_instance_of(String).to receive(:constantize) { Draper::DecoratedEnumerableProxy }
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expect{ProductDecorator.decorate_collection([])}.to raise_error NameError, /Draper::DecoratedEnumerableProxy/
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end
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end
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end
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describe ".decorates" do
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protect_class Decorator
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it "sets .object_class with a symbol" do
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Decorator.decorates :product
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expect(Decorator.object_class).to be Product
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end
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it "sets .object_class with a string" do
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Decorator.decorates "product"
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expect(Decorator.object_class).to be Product
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end
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it "sets .object_class with a class" do
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Decorator.decorates Product
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expect(Decorator.object_class).to be Product
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end
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end
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describe ".object_class" do
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protect_class ProductDecorator
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protect_class Namespaced::ProductDecorator
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context "when not set by .decorates" do
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it "raises an UninferrableSourceError for a so-named 'Decorator'" do
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expect{Decorator.object_class}.to raise_error UninferrableSourceError
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end
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it "raises an UninferrableSourceError for anonymous decorators" do
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expect{Class.new(Decorator).object_class}.to raise_error UninferrableSourceError
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end
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it "raises an UninferrableSourceError for a decorator without a model" do
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skip
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expect{OtherDecorator.object_class}.to raise_error UninferrableSourceError
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end
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it "raises an UninferrableSourceError for other naming conventions" do
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expect{ProductPresenter.object_class}.to raise_error UninferrableSourceError
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end
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it "infers the source for '<Model>Decorator'" do
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expect(ProductDecorator.object_class).to be Product
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end
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it "infers namespaced sources" do
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expect(Namespaced::ProductDecorator.object_class).to be Namespaced::Product
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end
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context "when an unrelated NameError is thrown" do
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it "re-raises that error" do
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allow_any_instance_of(String).to receive(:constantize) { SomethingThatDoesntExist }
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expect{ProductDecorator.object_class}.to raise_error NameError, /SomethingThatDoesntExist/
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end
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end
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end
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it "is aliased to .source_class" do
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expect(ProductDecorator.source_class).to be Product
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end
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end
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describe ".object_class?" do
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it "returns truthy when .object_class is set" do
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allow(Decorator).to receive(:object_class).and_return(Model)
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expect(Decorator.object_class?).to be_truthy
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end
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it "returns false when .object_class is not inferrable" do
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allow(Decorator).to receive(:object_class).and_raise(UninferrableSourceError.new(Decorator))
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expect(Decorator.object_class?).to be_falsey
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end
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it "is aliased to .source_class?" do
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allow(Decorator).to receive(:object_class).and_return(Model)
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expect(Decorator.source_class?).to be_truthy
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end
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end
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describe ".decorates_association" do
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protect_class Decorator
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describe "options validation" do
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before { allow(DecoratedAssociation).to receive(:new).and_return(->{}) }
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it "does not raise error on valid options" do
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valid_options = {with: Class, scope: :sorted, context: {}}
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expect{Decorator.decorates_association(:children, valid_options)}.not_to raise_error
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end
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it "raises error on invalid options" do
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expect{Decorator.decorates_association(:children, foo: "bar")}.to raise_error ArgumentError, /Unknown key/
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end
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end
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describe "defines an association method" do
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it "creates a DecoratedAssociation" do
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options = {with: Class.new, scope: :foo, context: {}}
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Decorator.decorates_association :children, options
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decorator = Decorator.new(Model.new)
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expect(DecoratedAssociation).to receive(:new).with(decorator, :children, options).and_return(->{})
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decorator.children
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end
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it "memoizes the DecoratedAssociation" do
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Decorator.decorates_association :children
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decorator = Decorator.new(Model.new)
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expect(DecoratedAssociation).to receive(:new).once.and_return(->{})
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decorator.children
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decorator.children
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end
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it "calls the DecoratedAssociation" do
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Decorator.decorates_association :children
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decorator = Decorator.new(Model.new)
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decorated_association = ->{}
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allow(DecoratedAssociation).to receive(:new).and_return(decorated_association)
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expect(decorated_association).to receive(:call).and_return(:decorated)
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expect(decorator.children).to be :decorated
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end
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end
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end
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describe ".decorates_associations" do
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protect_class Decorator
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it "decorates each of the associations" do
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expect(Decorator).to receive(:decorates_association).with(:friends, {})
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expect(Decorator).to receive(:decorates_association).with(:enemies, {})
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Decorator.decorates_associations :friends, :enemies
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end
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it "dispatches options" do
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options = {with: Class.new, scope: :foo, context: {}}
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expect(Decorator).to receive(:decorates_association).with(:friends, options)
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expect(Decorator).to receive(:decorates_association).with(:enemies, options)
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Decorator.decorates_associations :friends, :enemies, options
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end
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end
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describe "#applied_decorators" do
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it "returns a list of decorators applied to a model" do
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decorator = ProductDecorator.new(OtherDecorator.new(Decorator.new(Model.new)))
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expect(decorator.applied_decorators).to eq [Decorator, OtherDecorator, ProductDecorator]
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end
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end
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describe "#decorated_with?" do
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it "checks if a decorator has been applied to a model" do
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decorator = ProductDecorator.new(Decorator.new(Model.new))
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expect(decorator).to be_decorated_with Decorator
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expect(decorator).to be_decorated_with ProductDecorator
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expect(decorator).not_to be_decorated_with OtherDecorator
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end
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end
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describe "#decorated?" do
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it "returns true" do
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decorator = Decorator.new(Model.new)
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expect(decorator).to be_decorated
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end
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end
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describe "#object" do
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it "returns the wrapped object" do
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object = Model.new
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decorator = Decorator.new(object)
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expect(decorator.object).to be object
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expect(decorator.model).to be object
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expect(decorator.to_source).to be object
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end
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it "is aliased to #model" do
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object = Model.new
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decorator = Decorator.new(object)
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expect(decorator.model).to be object
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end
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it "is aliased to #source" do
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object = Model.new
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decorator = Decorator.new(object)
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expect(decorator.source).to be object
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end
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it "is aliased to #to_source" do
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object = Model.new
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decorator = Decorator.new(object)
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expect(decorator.to_source).to be object
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end
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end
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describe "aliasing object to object class name" do
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context "when object_class is inferrable from the decorator name" do
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it "aliases object to the object class name" do
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object = double
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decorator = ProductDecorator.new(object)
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expect(decorator.product).to be object
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end
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end
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context "when object_class is set by decorates" do
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it "aliases object to the object class name" do
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decorator_class = Class.new(Decorator) { decorates Product }
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object = double
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decorator = decorator_class.new(object)
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expect(decorator.product).to be object
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end
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end
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context "when object_class's name is several words long" do
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it "underscores the method name" do
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stub_const "LongWindedModel", Class.new
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decorator_class = Class.new(Decorator) { decorates LongWindedModel }
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object = double
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decorator = decorator_class.new(object)
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expect(decorator.long_winded_model).to be object
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end
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end
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context "when object_class is not set" do
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it "does not alias object" do
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decorator_class = Class.new(Decorator)
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expect(decorator_class.instance_methods).to eq Decorator.instance_methods
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end
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end
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end
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describe "#to_model" do
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it "returns the decorator" do
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decorator = Decorator.new(Model.new)
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expect(decorator.to_model).to be decorator
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end
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end
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describe "#to_param" do
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it "delegates to the object" do
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decorator = Decorator.new(double(to_param: :delegated))
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expect(decorator.to_param).to be :delegated
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end
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end
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describe "#present?" do
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it "delegates to the object" do
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decorator = Decorator.new(double(present?: :delegated))
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expect(decorator.present?).to be :delegated
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end
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end
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describe "#blank?" do
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it "delegates to the object" do
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decorator = Decorator.new(double(blank?: :delegated))
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expect(decorator.blank?).to be :delegated
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end
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end
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describe "#to_partial_path" do
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it "delegates to the object" do
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decorator = Decorator.new(double(to_partial_path: :delegated))
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expect(decorator.to_partial_path).to be :delegated
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end
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end
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describe "#to_s" do
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it "delegates to the object" do
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decorator = Decorator.new(double(to_s: :delegated))
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expect(decorator.to_s).to be :delegated
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end
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end
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describe "#inspect" do
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it "returns a detailed description of the decorator" do
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decorator = ProductDecorator.new(double)
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expect(decorator.inspect).to match /#<ProductDecorator:0x\h+ .+>/
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end
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it "includes the object" do
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decorator = Decorator.new(double(inspect: "#<the object>"))
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expect(decorator.inspect).to include "@object=#<the object>"
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end
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it "includes the context" do
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decorator = Decorator.new(double, context: {foo: "bar"})
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expect(decorator.inspect).to include '@context={:foo=>"bar"}'
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end
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it "includes other instance variables" do
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decorator = Decorator.new(double)
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decorator.instance_variable_set :@foo, "bar"
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expect(decorator.inspect).to include '@foo="bar"'
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end
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end
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describe "#attributes" do
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it "returns only the object's attributes that are implemented by the decorator" do
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decorator = Decorator.new(double(attributes: {foo: "bar", baz: "qux"}))
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allow(decorator).to receive(:foo)
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expect(decorator.attributes).to eq({foo: "bar"})
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end
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end
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describe ".model_name" do
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it "delegates to the source class" do
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allow(Decorator).to receive(:object_class).and_return(double(model_name: :delegated))
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expect(Decorator.model_name).to be :delegated
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end
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end
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describe "#==" do
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it "works for a object that does not include Decoratable" do
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object = Object.new
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decorator = Decorator.new(object)
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expect(decorator).to eq Decorator.new(object)
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end
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it "works for a multiply-decorated object that does not include Decoratable" do
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object = Object.new
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decorator = Decorator.new(object)
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expect(decorator).to eq ProductDecorator.new(Decorator.new(object))
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end
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it "is true when object #== is true" do
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object = Model.new
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decorator = Decorator.new(object)
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other = double(object: Model.new)
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expect(object).to receive(:==).with(other).and_return(true)
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expect(decorator == other).to be_truthy
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end
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it "is false when object #== is false" do
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object = Model.new
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decorator = Decorator.new(object)
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other = double(object: Model.new)
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expect(object).to receive(:==).with(other).and_return(false)
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expect(decorator == other).to be_falsey
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end
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end
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describe "#===" do
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it "is true when #== is true" do
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decorator = Decorator.new(Model.new)
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allow(decorator).to receive(:==) { true }
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expect(decorator === :anything).to be_truthy
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end
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it "is false when #== is false" do
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decorator = Decorator.new(Model.new)
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allow(decorator).to receive(:==).with(:anything).and_return(false)
|
|
|
|
expect(decorator === :anything).to be_falsey
|
|
end
|
|
end
|
|
|
|
describe "#eql?" do
|
|
it "is true when #eql? is true" do
|
|
first = Decorator.new('foo')
|
|
second = Decorator.new('foo')
|
|
|
|
expect(first.eql? second).to be
|
|
end
|
|
|
|
it "is false when #eql? is false" do
|
|
first = Decorator.new('foo')
|
|
second = Decorator.new('bar')
|
|
|
|
expect(first.eql? second).to_not be
|
|
end
|
|
end
|
|
|
|
describe "#hash" do
|
|
it "is consistent for equal objects" do
|
|
object = Model.new
|
|
first = Decorator.new(object)
|
|
second = Decorator.new(object)
|
|
|
|
expect(first.hash == second.hash).to be
|
|
end
|
|
end
|
|
|
|
describe ".delegate" do
|
|
protect_class Decorator
|
|
|
|
it "defaults the :to option to :object" do
|
|
expect(Object).to receive(:delegate).with(:foo, :bar, to: :object)
|
|
Decorator.delegate :foo, :bar
|
|
end
|
|
|
|
it "does not overwrite the :to option if supplied" do
|
|
expect(Object).to receive(:delegate).with(:foo, :bar, to: :baz)
|
|
Decorator.delegate :foo, :bar, to: :baz
|
|
end
|
|
end
|
|
|
|
context "with .delegate_all" do
|
|
protect_class Decorator
|
|
|
|
before { Decorator.delegate_all }
|
|
|
|
describe "#method_missing" do
|
|
it "delegates missing methods that exist on the object" do
|
|
decorator = Decorator.new(double(hello_world: :delegated))
|
|
|
|
expect(decorator.hello_world).to be :delegated
|
|
end
|
|
|
|
it "adds delegated methods to the decorator when they are used" do
|
|
decorator = Decorator.new(double(hello_world: :delegated))
|
|
|
|
expect(decorator.methods).not_to include :hello_world
|
|
decorator.hello_world
|
|
expect(decorator.methods).to include :hello_world
|
|
end
|
|
|
|
it "allows decorator to decorate different classes of objects" do
|
|
decorator_1 = Decorator.new(double)
|
|
decorator_2 = Decorator.new(double(hello_world: :delegated))
|
|
|
|
decorator_2.hello_world
|
|
expect(decorator_1.methods).not_to include :hello_world
|
|
end
|
|
|
|
it "passes blocks to delegated methods" do
|
|
object = Model.new
|
|
allow(object).to receive(:hello_world) { |*args, &block| block.call }
|
|
decorator = Decorator.new(object)
|
|
|
|
expect(decorator.hello_world{:yielded}).to be :yielded
|
|
end
|
|
|
|
it "does not confuse Kernel#Array" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(Array(decorator)).to be_an Array
|
|
end
|
|
|
|
it "delegates already-delegated methods" do
|
|
object = Class.new{ delegate :bar, to: :foo }.new
|
|
allow(object).to receive_messages foo: double(bar: :delegated)
|
|
decorator = Decorator.new(object)
|
|
|
|
expect(decorator.bar).to be :delegated
|
|
end
|
|
|
|
it "does not delegate private methods" do
|
|
object = Class.new{ private; def hello_world; end }.new
|
|
decorator = Decorator.new(object)
|
|
|
|
expect{decorator.hello_world}.to raise_error NoMethodError
|
|
end
|
|
|
|
it "does not delegate methods that do not exist on the object" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.methods).not_to include :hello_world
|
|
expect{decorator.hello_world}.to raise_error NoMethodError
|
|
expect(decorator.methods).not_to include :hello_world
|
|
end
|
|
end
|
|
|
|
context ".method_missing" do
|
|
context "without a source class" do
|
|
it "raises a NoMethodError on missing methods" do
|
|
expect{Decorator.hello_world}.to raise_error NoMethodError
|
|
end
|
|
end
|
|
|
|
context "with a source class" do
|
|
it "delegates methods that exist on the source class" do
|
|
object_class = Class.new
|
|
allow(object_class).to receive_messages hello_world: :delegated
|
|
allow(Decorator).to receive_messages object_class: object_class
|
|
|
|
expect(Decorator.hello_world).to be :delegated
|
|
end
|
|
|
|
it "does not delegate methods that do not exist on the source class" do
|
|
allow(Decorator).to receive_messages object_class: Class.new
|
|
|
|
expect{Decorator.hello_world}.to raise_error NoMethodError
|
|
end
|
|
end
|
|
end
|
|
|
|
describe "#respond_to?" do
|
|
it "returns true for its own methods" do
|
|
Decorator.class_eval{def hello_world; end}
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator).to respond_to :hello_world
|
|
end
|
|
|
|
it "returns true for the object's methods" do
|
|
decorator = Decorator.new(double(hello_world: :delegated))
|
|
|
|
expect(decorator).to respond_to :hello_world
|
|
end
|
|
|
|
context "with include_private" do
|
|
it "returns true for its own private methods" do
|
|
Decorator.class_eval{private; def hello_world; end}
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.respond_to?(:hello_world, true)).to be_truthy
|
|
end
|
|
|
|
it "returns false for the object's private methods" do
|
|
object = Class.new{private; def hello_world; end}.new
|
|
decorator = Decorator.new(object)
|
|
|
|
expect(decorator.respond_to?(:hello_world, true)).to be_falsey
|
|
end
|
|
end
|
|
end
|
|
|
|
describe ".respond_to?" do
|
|
context "without a source class" do
|
|
it "returns true for its own class methods" do
|
|
Decorator.class_eval{def self.hello_world; end}
|
|
|
|
expect(Decorator).to respond_to :hello_world
|
|
end
|
|
|
|
it "returns false for other class methods" do
|
|
expect(Decorator).not_to respond_to :goodnight_moon
|
|
end
|
|
end
|
|
|
|
context "with a source class" do
|
|
it "returns true for its own class methods" do
|
|
Decorator.class_eval{def self.hello_world; end}
|
|
allow(Decorator).to receive_messages object_class: Class.new
|
|
|
|
expect(Decorator).to respond_to :hello_world
|
|
end
|
|
|
|
it "returns true for the source's class methods" do
|
|
allow(Decorator).to receive_messages object_class: double(hello_world: :delegated)
|
|
|
|
expect(Decorator).to respond_to :hello_world
|
|
end
|
|
end
|
|
end
|
|
|
|
describe "#respond_to_missing?" do
|
|
it "allows #method to be called on delegated methods" do
|
|
object = Class.new{def hello_world; end}.new
|
|
decorator = Decorator.new(object)
|
|
|
|
expect(decorator.method(:hello_world)).not_to be_nil
|
|
end
|
|
end
|
|
|
|
describe ".respond_to_missing?" do
|
|
it "allows .method to be called on delegated class methods" do
|
|
allow(Decorator).to receive_messages object_class: double(hello_world: :delegated)
|
|
|
|
expect(Decorator.method(:hello_world)).not_to be_nil
|
|
end
|
|
end
|
|
end
|
|
|
|
describe "class spoofing" do
|
|
it "pretends to be a kind of the source class" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.kind_of?(Model)).to be_truthy
|
|
expect(decorator.is_a?(Model)).to be_truthy
|
|
end
|
|
|
|
it "is still a kind of its own class" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.kind_of?(Decorator)).to be_truthy
|
|
expect(decorator.is_a?(Decorator)).to be_truthy
|
|
end
|
|
|
|
it "pretends to be an instance of the source class" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.instance_of?(Model)).to be_truthy
|
|
end
|
|
|
|
it "is still an instance of its own class" do
|
|
decorator = Decorator.new(Model.new)
|
|
|
|
expect(decorator.instance_of?(Decorator)).to be_truthy
|
|
end
|
|
end
|
|
|
|
describe ".decorates_finders" do
|
|
protect_class Decorator
|
|
|
|
it "extends the Finders module" do
|
|
expect(Decorator).not_to be_a_kind_of Finders
|
|
Decorator.decorates_finders
|
|
expect(Decorator).to be_a_kind_of Finders
|
|
end
|
|
end
|
|
|
|
describe "Enumerable hash and equality functionality" do
|
|
describe "#uniq" do
|
|
it "removes duplicate objects with same decorator" do
|
|
object = Model.new
|
|
array = [Decorator.new(object), Decorator.new(object)]
|
|
|
|
expect(array.uniq.count).to eq(1)
|
|
end
|
|
|
|
it "separates different objects with identical decorators" do
|
|
array = [Decorator.new('foo'), Decorator.new('bar')]
|
|
|
|
expect(array.uniq.count).to eq(2)
|
|
end
|
|
|
|
it "separates identical objects with different decorators" do
|
|
object = Model.new
|
|
array = [Decorator.new(object), OtherDecorator.new(object)]
|
|
|
|
expect(array.uniq.count).to eq(2)
|
|
end
|
|
|
|
it "distinguishes between an objects and its decorated version" do
|
|
object = Model.new
|
|
array = [Decorator.new(object), object]
|
|
|
|
expect(array.uniq.count).to eq(2)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|