debian-mirror-gitlab/spec/lib/feature_spec.rb

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# frozen_string_literal: true
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require 'spec_helper'
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describe Feature, stub_feature_flags: false do
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before do
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# reset Flipper AR-engine
Feature.reset
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end
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describe '.get' do
let(:feature) { double(:feature) }
let(:key) { 'my_feature' }
it 'returns the Flipper feature' do
expect_any_instance_of(Flipper::DSL).to receive(:feature).with(key)
.and_return(feature)
expect(described_class.get(key)).to be(feature)
end
end
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describe '.persisted_names' do
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context 'when FF_LEGACY_PERSISTED_NAMES=false' do
before do
stub_env('FF_LEGACY_PERSISTED_NAMES', 'false')
end
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it 'returns the names of the persisted features' do
Feature.enable('foo')
expect(described_class.persisted_names).to contain_exactly('foo')
end
it 'returns an empty Array when no features are presisted' do
expect(described_class.persisted_names).to be_empty
end
it 'caches the feature names when request store is active',
:request_store, :use_clean_rails_memory_store_caching do
Feature.enable('foo')
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expect(Gitlab::ProcessMemoryCache.cache_backend)
.to receive(:fetch)
.once
.with('flipper/v1/features', expires_in: 1.minute)
.and_call_original
2.times do
expect(described_class.persisted_names).to contain_exactly('foo')
end
end
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end
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context 'when FF_LEGACY_PERSISTED_NAMES=true' do
before do
stub_env('FF_LEGACY_PERSISTED_NAMES', 'true')
end
it 'returns the names of the persisted features' do
Feature.enable('foo')
expect(described_class.persisted_names).to contain_exactly('foo')
end
it 'returns an empty Array when no features are presisted' do
expect(described_class.persisted_names).to be_empty
end
it 'caches the feature names when request store is active',
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:request_store, :use_clean_rails_memory_store_caching do
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Feature.enable('foo')
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expect(Gitlab::ProcessMemoryCache.cache_backend)
.to receive(:fetch)
.once
.with('flipper:persisted_names', expires_in: 1.minute)
.and_call_original
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2.times do
expect(described_class.persisted_names).to contain_exactly('foo')
end
end
end
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it 'fetches all flags once in a single query', :request_store do
Feature.enable('foo1')
Feature.enable('foo2')
queries = ActiveRecord::QueryRecorder.new(skip_cached: false) do
expect(described_class.persisted_names).to contain_exactly('foo1', 'foo2')
RequestStore.clear!
expect(described_class.persisted_names).to contain_exactly('foo1', 'foo2')
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end
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expect(queries.count).to eq(1)
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end
end
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describe '.persisted_name?' do
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context 'when the feature is persisted' do
it 'returns true when feature name is a string' do
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Feature.enable('foo')
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expect(described_class.persisted_name?('foo')).to eq(true)
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end
it 'returns true when feature name is a symbol' do
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Feature.enable('foo')
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expect(described_class.persisted_name?(:foo)).to eq(true)
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end
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end
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context 'when the feature is not persisted' do
it 'returns false when feature name is a string' do
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expect(described_class.persisted_name?('foo')).to eq(false)
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end
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it 'returns false when feature name is a symbol' do
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expect(described_class.persisted_name?(:bar)).to eq(false)
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end
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end
end
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describe '.all' do
let(:features) { Set.new }
it 'returns the Flipper features as an array' do
expect_any_instance_of(Flipper::DSL).to receive(:features)
.and_return(features)
expect(described_class.all).to eq(features.to_a)
end
end
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describe '.flipper' do
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context 'when request store is inactive' do
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it 'memoizes the Flipper instance' do
expect(Flipper).to receive(:new).once.and_call_original
2.times do
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described_class.send(:flipper)
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end
end
end
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context 'when request store is active', :request_store do
it 'memoizes the Flipper instance' do
expect(Flipper).to receive(:new).once.and_call_original
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described_class.send(:flipper)
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described_class.instance_variable_set(:@flipper, nil)
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described_class.send(:flipper)
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end
end
end
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describe '.enabled?' do
it 'returns false for undefined feature' do
expect(described_class.enabled?(:some_random_feature_flag)).to be_falsey
end
it 'returns true for undefined feature with default_enabled' do
expect(described_class.enabled?(:some_random_feature_flag, default_enabled: true)).to be_truthy
end
it 'returns false for existing disabled feature in the database' do
described_class.disable(:disabled_feature_flag)
expect(described_class.enabled?(:disabled_feature_flag)).to be_falsey
end
it 'returns true for existing enabled feature in the database' do
described_class.enable(:enabled_feature_flag)
expect(described_class.enabled?(:enabled_feature_flag)).to be_truthy
end
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it { expect(described_class.send(:l1_cache_backend)).to eq(Gitlab::ProcessMemoryCache.cache_backend) }
it { expect(described_class.send(:l2_cache_backend)).to eq(Rails.cache) }
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it 'caches the status in L1 and L2 caches',
:request_store, :use_clean_rails_memory_store_caching do
described_class.enable(:enabled_feature_flag)
flipper_key = "flipper/v1/feature/enabled_feature_flag"
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expect(described_class.send(:l2_cache_backend))
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.to receive(:fetch)
.once
.with(flipper_key, expires_in: 1.hour)
.and_call_original
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expect(described_class.send(:l1_cache_backend))
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.to receive(:fetch)
.once
.with(flipper_key, expires_in: 1.minute)
.and_call_original
2.times do
expect(described_class.enabled?(:enabled_feature_flag)).to be_truthy
end
end
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it 'returns the default value when the database does not exist' do
fake_default = double('fake default')
expect(ActiveRecord::Base).to receive(:connection) { raise ActiveRecord::NoDatabaseError, "No database" }
expect(described_class.enabled?(:a_feature, default_enabled: fake_default)).to eq(fake_default)
end
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context 'cached feature flag', :request_store do
let(:flag) { :some_feature_flag }
before do
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described_class.send(:flipper).memoize = false
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described_class.enabled?(flag)
end
it 'caches the status in L1 cache for the first minute' do
expect do
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expect(described_class.send(:l1_cache_backend)).to receive(:fetch).once.and_call_original
expect(described_class.send(:l2_cache_backend)).not_to receive(:fetch)
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expect(described_class.enabled?(flag)).to be_truthy
end.not_to exceed_query_limit(0)
end
it 'caches the status in L2 cache after 2 minutes' do
Timecop.travel 2.minutes do
expect do
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expect(described_class.send(:l1_cache_backend)).to receive(:fetch).once.and_call_original
expect(described_class.send(:l2_cache_backend)).to receive(:fetch).once.and_call_original
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expect(described_class.enabled?(flag)).to be_truthy
end.not_to exceed_query_limit(0)
end
end
it 'fetches the status after an hour' do
Timecop.travel 61.minutes do
expect do
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expect(described_class.send(:l1_cache_backend)).to receive(:fetch).once.and_call_original
expect(described_class.send(:l2_cache_backend)).to receive(:fetch).once.and_call_original
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expect(described_class.enabled?(flag)).to be_truthy
end.not_to exceed_query_limit(1)
end
end
end
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context 'with an individual actor' do
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let(:actor) { stub_feature_flag_gate('CustomActor:5') }
let(:another_actor) { stub_feature_flag_gate('CustomActor:10') }
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before do
described_class.enable(:enabled_feature_flag, actor)
end
it 'returns true when same actor is informed' do
expect(described_class.enabled?(:enabled_feature_flag, actor)).to be_truthy
end
it 'returns false when different actor is informed' do
expect(described_class.enabled?(:enabled_feature_flag, another_actor)).to be_falsey
end
it 'returns false when no actor is informed' do
expect(described_class.enabled?(:enabled_feature_flag)).to be_falsey
end
end
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context 'with invalid actor' do
let(:actor) { double('invalid actor') }
context 'when is dev_or_test_env' do
it 'does raise exception' do
expect { described_class.enabled?(:enabled_feature_flag, actor) }
.to raise_error /needs to include `FeatureGate` or implement `flipper_id`/
end
end
end
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end
describe '.disable?' do
it 'returns true for undefined feature' do
expect(described_class.disabled?(:some_random_feature_flag)).to be_truthy
end
it 'returns false for undefined feature with default_enabled' do
expect(described_class.disabled?(:some_random_feature_flag, default_enabled: true)).to be_falsey
end
it 'returns true for existing disabled feature in the database' do
described_class.disable(:disabled_feature_flag)
expect(described_class.disabled?(:disabled_feature_flag)).to be_truthy
end
it 'returns false for existing enabled feature in the database' do
described_class.enable(:enabled_feature_flag)
expect(described_class.disabled?(:enabled_feature_flag)).to be_falsey
end
end
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describe '.remove' do
context 'for a non-persisted feature' do
it 'returns nil' do
expect(described_class.remove(:non_persisted_feature_flag)).to be_nil
end
end
context 'for a persisted feature' do
it 'returns true' do
described_class.enable(:persisted_feature_flag)
expect(described_class.remove(:persisted_feature_flag)).to be_truthy
end
end
end
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describe Feature::Target do
describe '#targets' do
let(:project) { create(:project) }
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let(:group) { create(:group) }
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let(:user_name) { project.owner.username }
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subject { described_class.new(user: user_name, project: project.full_path, group: group.full_path) }
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it 'returns all found targets' do
expect(subject.targets).to be_an(Array)
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expect(subject.targets).to eq([project.owner, project, group])
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end
end
end
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end