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# encoding: utf-8
require 'spec_helper'
require File.expand_path('../../fixtures/classes', __FILE__)
shared_examples_for 'memoizes method' do
it 'memoizes the instance method' do
subject
instance = object.new
expect(instance.send(method)).to be(instance.send(method))
end
it 'creates a zero arity method', :unless => RUBY_VERSION == '1.8.7' do
subject
expect(object.new.method(method).arity).to be_zero
end
context 'when the initializer calls the memoized method' do
before do
method = self.method
object.send(:define_method, :initialize) { send(method) }
end
it 'allows the memoized method to be called within the initializer' do
subject
expect { object.new }.to_not raise_error
end
end
end
describe Memoizable::ModuleMethods, '#memoize' do
subject { object.memoize(method) }
let(:object) do
stub_const 'TestClass', Class.new(Fixture::Object) {
def some_state
Object.new
end
}
end
context 'on method with required arguments' do
let(:method) { :required_arguments }
it 'should raise error' do
expect { subject }.to raise_error(
Memoizable::MethodBuilder::InvalidArityError,
'Cannot memoize TestClass#required_arguments, its arity is 1'
)
end
end
context 'on method with optional arguments' do
let(:method) { :optional_arguments }
it 'should raise error' do
expect { subject }.to raise_error(
Memoizable::MethodBuilder::InvalidArityError,
'Cannot memoize TestClass#optional_arguments, its arity is -1'
)
end
end
context 'memoized method that returns generated values' do
let(:method) { :some_state }
it_should_behave_like 'a command method'
it_should_behave_like 'memoizes method'
it 'creates a method that returns a frozen value' do
subject
expect(object.new.send(method)).to be_frozen
end
end
context 'public method' do
let(:method) { :public_method }
it_should_behave_like 'a command method'
it_should_behave_like 'memoizes method'
it 'is still a public method' do
should be_public_method_defined(method)
end
it 'creates a method that returns a frozen value' do
subject
expect(object.new.send(method)).to be_frozen
end
end
context 'protected method' do
let(:method) { :protected_method }
it_should_behave_like 'a command method'
it_should_behave_like 'memoizes method'
it 'is still a protected method' do
should be_protected_method_defined(method)
end
it 'creates a method that returns a frozen value' do
subject
expect(object.new.send(method)).to be_frozen
end
end
context 'private method' do
let(:method) { :private_method }
it_should_behave_like 'a command method'
it_should_behave_like 'memoizes method'
it 'is still a private method' do
should be_private_method_defined(method)
end
it 'creates a method that returns a frozen value' do
subject
expect(object.new.send(method)).to be_frozen
end
end
end
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