82 lines
1.8 KiB
Ruby
82 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::Utils::StrongMemoize do
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let(:klass) do
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struct = Struct.new(:value) do
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def method_name
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strong_memoize(:method_name) do
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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 trace
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@trace ||= []
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end
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end
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struct.include(described_class)
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struct
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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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it 'only calls the block once' do
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value0 = object.method_name
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value1 = object.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.method_name
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memoized_value = object.instance_variable_get(:@method_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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it_behaves_like 'caching the value'
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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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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.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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describe '#clear_memoization' do
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let(:value) { 'mepmep' }
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it 'removes the instance variable' do
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object.method_name
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object.clear_memoization(:method_name)
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expect(object.instance_variable_defined?(:@method_name)).to be(false)
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end
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end
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end
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