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require 'support/doubled_classes'
module RSpec
module Mocks
RSpec.describe 'Constructing a verifying double' do
include_context 'with isolated configuration'
class ClassThatDynamicallyDefinesMethods
def self.define_attribute_methods!
define_method(:some_method_defined_dynamically) { true }
end
end
module CustomModule
end
describe 'instance doubles' do
it 'cannot be constructed with a non-module object' do
expect {
instance_double(Object.new)
}.to raise_error(/Module or String expected/)
end
it 'can be constructed with a struct' do
o = instance_double(Struct.new(:defined_method), :defined_method => 1)
expect(o.defined_method).to eq(1)
end
it 'allows named constants to be looked up and declared to verifying double callbacks' do
expect { |probe|
RSpec.configuration.mock_with(:rspec) do |config|
config.verify_doubled_constant_names = true
config.when_declaring_verifying_double(&probe)
end
instance_double("RSpec::Mocks::ClassThatDynamicallyDefinesMethods")
}.to yield_with_args(have_attributes :target => ClassThatDynamicallyDefinesMethods)
end
it 'allows anonymous constants to be looked up and declared to verifying double callbacks' do
anonymous_module = Module.new
expect { |probe|
RSpec.configuration.mock_with(:rspec) do |config|
config.verify_doubled_constant_names = true
config.when_declaring_verifying_double(&probe)
end
instance_double(anonymous_module)
}.to yield_with_args(have_attributes :target => anonymous_module)
end
it 'allows classes to be customised' do
test_class = Class.new(ClassThatDynamicallyDefinesMethods)
RSpec.configuration.mock_with(:rspec) do |config|
config.when_declaring_verifying_double do |reference|
reference.target.define_attribute_methods!
end
end
instance_double(test_class, :some_method_defined_dynamically => true)
end
end
describe 'class doubles' do
it 'cannot be constructed with a non-module object' do
expect {
class_double(Object.new)
}.to raise_error(/Module or String expected/)
end
it 'declares named modules to verifying double callbacks' do
expect { |probe|
RSpec.configuration.mock_with(:rspec) do |config|
config.when_declaring_verifying_double(&probe)
end
class_double CustomModule
}.to yield_with_args(have_attributes :target => CustomModule)
end
it 'declares anonymous modules to verifying double callbacks' do
anonymous_module = Module.new
expect { |probe|
RSpec.configuration.mock_with(:rspec) do |config|
config.when_declaring_verifying_double(&probe)
end
class_double anonymous_module
}.to yield_with_args(have_attributes :target => anonymous_module)
end
end
describe 'object doubles' do
it 'declares the class to verifying double callbacks' do
object = Object.new
expect { |probe|
RSpec.configuration.mock_with(:rspec) do |config|
config.when_declaring_verifying_double(&probe)
end
object_double object
}.to yield_with_args(have_attributes :target => object)
end
end
describe 'when verify_doubled_constant_names config option is set' do
before do
RSpec::Mocks.configuration.verify_doubled_constant_names = true
end
it 'prevents creation of instance doubles for unloaded constants' do
expect {
instance_double('LoadedClas')
}.to raise_error(VerifyingDoubleNotDefinedError)
end
it 'prevents creation of class doubles for unloaded constants' do
expect {
class_double('LoadedClas')
}.to raise_error(VerifyingDoubleNotDefinedError)
end
end
it 'can only be named with a string or a module' do
expect { instance_double(1) }.to raise_error(ArgumentError)
expect { instance_double(nil) }.to raise_error(ArgumentError)
end
end
end
end
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