325 lines
9 KiB
Ruby
325 lines
9 KiB
Ruby
# frozen_string_literal: true
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require 'fast_spec_helper'
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require 'rspec-benchmark'
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require 'rspec-parameterized'
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RSpec.configure do |config|
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config.include RSpec::Benchmark::Matchers
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end
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RSpec.describe Gitlab::Utils::StrongMemoize, feature_category: :not_owned do
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let(:klass) do
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strong_memoize_class = described_class
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Struct.new(:value) do
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include strong_memoize_class
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def self.method_added_list
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@method_added_list ||= []
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end
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def self.method_added(name)
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method_added_list << name
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end
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def method_name
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strong_memoize(:method_name) do # rubocop: disable Gitlab/StrongMemoizeAttr
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trace << value
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value
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end
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end
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def method_name_attr
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trace << value
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value
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end
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strong_memoize_attr :method_name_attr
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def enabled?
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trace << value
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value
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end
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strong_memoize_attr :enabled?
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def method_name_with_args(*args)
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strong_memoize_with(:method_name_with_args, args) do
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trace << [value, args]
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value
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end
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end
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def trace
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@trace ||= []
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end
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protected
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def private_method; end
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private :private_method
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strong_memoize_attr :private_method
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public
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def protected_method; end
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protected :protected_method
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strong_memoize_attr :protected_method
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private
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def public_method; end
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public :public_method
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strong_memoize_attr :public_method
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end
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end
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subject(:object) { klass.new(value) }
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shared_examples 'caching the value' do
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let(:member_name) { described_class.normalize_key(method_name) }
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it 'only calls the block once' do
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value0 = object.send(method_name)
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value1 = object.send(method_name)
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expect(value0).to eq(value)
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expect(value1).to eq(value)
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expect(object.trace).to contain_exactly(value)
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end
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it 'returns and defines the instance variable for the exact value' do
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returned_value = object.send(method_name)
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memoized_value = object.instance_variable_get(:"@#{member_name}")
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expect(returned_value).to eql(value)
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expect(memoized_value).to eql(value)
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end
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end
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describe '#strong_memoize' do
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[nil, false, true, 'value', 0, [0]].each do |value|
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context "with value #{value}" do
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let(:value) { value }
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let(:method_name) { :method_name }
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it_behaves_like 'caching the value'
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it 'raises exception for invalid type as key' do
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expect { object.strong_memoize(10) { 20 } }.to raise_error /Invalid type of '10'/
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end
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it 'raises exception for invalid characters in key' do
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expect { object.strong_memoize(:enabled?) { 20 } }
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.to raise_error /is not allowed as an instance variable name/
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end
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end
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end
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context "memory allocation", type: :benchmark do
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let(:value) { 'aaa' }
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before do
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object.method_name # warmup
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end
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[:method_name, "method_name"].each do |argument|
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context "for #{argument.class}" do
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it 'does allocate exactly one string when fetching value' do
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expect do
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object.strong_memoize(argument) { 10 }
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end.to perform_allocation(1)
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end
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it 'does allocate exactly one string when storing value' do
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object.clear_memoization(:method_name) # clear to force set
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expect do
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object.strong_memoize(argument) { 10 }
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end.to perform_allocation(1)
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end
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end
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end
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end
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end
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describe '#strong_memoize_with' do
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[nil, false, true, 'value', 0, [0]].each do |value|
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context "with value #{value}" do
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let(:value) { value }
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it 'only calls the block once' do
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value0 = object.method_name_with_args(1)
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value1 = object.method_name_with_args(1)
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value2 = object.method_name_with_args([2, 3])
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value3 = object.method_name_with_args([2, 3])
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expect(value0).to eq(value)
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expect(value1).to eq(value)
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expect(value2).to eq(value)
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expect(value3).to eq(value)
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expect(object.trace).to contain_exactly([value, [1]], [value, [[2, 3]]])
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end
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it 'returns and defines the instance variable for the exact value' do
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returned_value = object.method_name_with_args(1, 2, 3)
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memoized_value = object.instance_variable_get(:@method_name_with_args)
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expect(returned_value).to eql(value)
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expect(memoized_value).to eql({ [[1, 2, 3]] => value })
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end
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end
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end
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end
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describe '#strong_memoized?' do
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shared_examples 'memoization check' do |method_name|
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context "for #{method_name}" do
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let(:value) { :anything }
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subject { object.strong_memoized?(method_name) }
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it 'returns false if the value is uncached' do
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is_expected.to be(false)
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end
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it 'returns true if the value is cached' do
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object.public_send(method_name)
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is_expected.to be(true)
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end
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end
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end
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it_behaves_like 'memoization check', :method_name
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it_behaves_like 'memoization check', :enabled?
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end
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describe '#clear_memoization' do
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shared_examples 'clearing memoization' do |method_name|
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let(:member_name) { described_class.normalize_key(method_name) }
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let(:value) { 'mepmep' }
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it 'removes the instance variable' do
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object.public_send(method_name)
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object.clear_memoization(method_name)
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expect(object.instance_variable_defined?(:"@#{member_name}")).to be(false)
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end
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end
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it_behaves_like 'clearing memoization', :method_name
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it_behaves_like 'clearing memoization', :enabled?
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end
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describe '.strong_memoize_attr' do
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[nil, false, true, 'value', 0, [0]].each do |value|
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let(:value) { value }
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context "memoized after method definition with value #{value}" do
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let(:method_name) { :method_name_attr }
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it_behaves_like 'caching the value'
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it 'calls the existing .method_added' do
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expect(klass.method_added_list).to include(:method_name_attr)
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end
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it 'retains method arity' do
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expect(klass.instance_method(method_name).arity).to eq(0)
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end
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end
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end
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describe 'method visibility' do
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it 'sets private visibility' do
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expect(klass.private_instance_methods).to include(:private_method)
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expect(klass.protected_instance_methods).not_to include(:private_method)
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expect(klass.public_instance_methods).not_to include(:private_method)
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end
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it 'sets protected visibility' do
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expect(klass.private_instance_methods).not_to include(:protected_method)
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expect(klass.protected_instance_methods).to include(:protected_method)
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expect(klass.public_instance_methods).not_to include(:protected_method)
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end
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it 'sets public visibility' do
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expect(klass.private_instance_methods).not_to include(:public_method)
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expect(klass.protected_instance_methods).not_to include(:public_method)
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expect(klass.public_instance_methods).to include(:public_method)
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end
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end
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context "when method doesn't exist" do
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let(:klass) do
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strong_memoize_class = described_class
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Struct.new(:value) do
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include strong_memoize_class
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end
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end
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subject { klass.strong_memoize_attr(:nonexistent_method) }
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it 'fails when strong-memoizing a nonexistent method' do
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expect { subject }.to raise_error(NameError, %r{undefined method `nonexistent_method' for class})
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end
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end
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context 'when memoized method has parameters' do
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it 'raises an error' do
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expected_message = /Using `strong_memoize_attr` on methods with parameters is not supported/
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expect do
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strong_memoize_class = described_class
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Class.new do
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include strong_memoize_class
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def method_with_parameters(params); end
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strong_memoize_attr :method_with_parameters
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end
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end.to raise_error(RuntimeError, expected_message)
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end
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end
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end
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describe '.normalize_key' do
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using RSpec::Parameterized::TableSyntax
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subject { described_class.normalize_key(input) }
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where(:input, :output, :valid) do
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:key | :key | true
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"key" | "key" | true
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:key? | "key？" | true
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"key?" | "key？" | true
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:key! | "key！" | true
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"key!" | "key！" | true
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# invalid cases caught elsewhere
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:"ke?y" | :"ke?y" | false
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"ke?y" | "ke?y" | false
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:"ke!y" | :"ke!y" | false
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"ke!y" | "ke!y" | false
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end
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with_them do
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let(:ivar) { "@#{output}" }
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it { is_expected.to eq(output) }
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if params[:valid]
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it 'is a valid ivar name' do
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expect { instance_variable_defined?(ivar) }.not_to raise_error
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end
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else
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it 'raises a NameError error' do
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expect { instance_variable_defined?(ivar) }
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.to raise_error(NameError, /not allowed as an instance/)
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end
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end
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end
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end
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end
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