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require 'spec_helper'
describe Feature do
context 'without FeatureRepository' do
it 'should raise an exception when calling active?' do
expect do
Feature.active?(:feature_a)
end.to raise_error('missing Repository for obtaining feature lists')
end
it 'should raise an exception when calling inactive?' do
expect do
Feature.inactive?(:feature_a)
end.to raise_error('missing Repository for obtaining feature lists')
end
it 'should raise an exception when calling with' do
expect do
Feature.with(:feature_a) do
end
end.to raise_error('missing Repository for obtaining feature lists')
end
it 'should raise an exception when calling without' do
expect do
Feature.without(:feature_a) do
end
end.to raise_error('missing Repository for obtaining feature lists')
end
it 'should raise an exception when calling active_features' do
expect do
Feature.active_features
end.to raise_error('missing Repository for obtaining feature lists')
end
end
context 'setting Repository' do
before(:each) do
@repository = Feature::Repository::SimpleRepository.new
end
context 'with auto_refresh set to false' do
before(:each) do
Feature.set_repository @repository
end
it 'should raise an exception when add repository with wrong class' do
expect do
Feature.set_repository('not a repository')
end.to raise_error(ArgumentError, 'given repository does not respond to active_features')
end
it 'should get active features lazy on first usage' do
@repository.add_active_feature(:feature_a)
# the line below will be the first usage of feature in this case
expect(Feature.active?(:feature_a)).to be_truthy
end
it 'should get active features from repository once' do
Feature.active?(:does_not_matter)
@repository.add_active_feature(:feature_a)
expect(Feature.active?(:feature_a)).to be_falsey
end
it 'should reload active features on first call only' do
@repository.add_active_feature(:feature_a)
expect(@repository).to receive(:active_features).once.and_return(@repository.active_features)
Feature.active?(:feature_a)
Feature.active?(:feature_a)
end
end
context 'with auto_refresh set to true' do
before(:each) do
Feature.set_repository @repository, true
end
it 'should reload active features on every call' do
@repository.add_active_feature(:feature_a)
expect(@repository).to receive(:active_features).twice.and_return(@repository.active_features)
Feature.active?(:feature_a)
Feature.active?(:feature_a)
end
end
context 'with timeout set to 30 seconds' do
before(:each) do
Timecop.freeze(Time.now)
Feature.set_repository @repository, 30
@repository.add_active_feature(:feature_a)
Feature.active?(:feature_a)
end
after(:each) do
Timecop.return
end
it 'should not update after 10 seconds' do
Timecop.freeze(Time.now + 10)
expect(@repository).not_to receive(:active_features)
Feature.active?(:feature_a)
end
it 'should update after 40 seconds' do
Timecop.freeze(Time.now + 40)
expect(@repository).to receive(:active_features).and_return(@repository.active_features)
Feature.active?(:feature_a)
end
end
end
context 'refresh features' do
before(:each) do
@repository = Feature::Repository::SimpleRepository.new
Feature.set_repository @repository
end
it 'should refresh active feature lists from repository' do
@repository.add_active_feature(:feature_a)
Feature.refresh!
expect(Feature.active?(:feature_a)).to be_truthy
end
end
context 'request features' do
before(:each) do
repository = Feature::Repository::SimpleRepository.new
repository.add_active_feature :feature_active
Feature.set_repository repository
end
it 'should affirm active feature is active' do
expect(Feature.active?(:feature_active)).to be_truthy
end
it 'should not affirm active feature is inactive' do
expect(Feature.inactive?(:feature_active)).to be_falsey
end
it 'should affirm inactive feature is inactive' do
expect(Feature.inactive?(:feature_inactive)).to be_truthy
end
it 'should not affirm inactive feature is active' do
expect(Feature.active?(:feature_inactive)).to be_falsey
end
it 'should call block with active feature in active list' do
reached = false
Feature.with(:feature_active) do
reached = true
end
expect(reached).to be_truthy
end
it 'should not call block with active feature not in active list' do
reached = false
Feature.with(:feature_inactive) do
reached = true
end
expect(reached).to be_falsey
end
it 'should raise exception when no block given to with' do
expect do
Feature.with(:feature_active)
end.to raise_error(ArgumentError, 'no block given to with')
end
it 'should call block without inactive feature in inactive list' do
reached = false
Feature.without(:feature_inactive) do
reached = true
end
expect(reached).to be_truthy
end
it 'should not call block without inactive feature in inactive list' do
reached = false
Feature.without(:feature_active) do
reached = true
end
expect(reached).to be_falsey
end
it 'should raise exception when no block given to without' do
expect do
Feature.without(:feature_inactive)
end.to raise_error(ArgumentError, 'no block given to without')
end
describe 'switch()' do
context 'given a value' do
it 'should return the first value if the feature is active' do
retval = Feature.switch(:feature_active, 1, 2)
expect(retval).to eq(1)
end
it 'should return the second value if the feature is inactive' do
retval = Feature.switch(:feature_inactive, 1, 2)
expect(retval).to eq(2)
end
end
context 'given a proc/lambda' do
it 'should call the first proc/lambda if the feature is active' do
retval = Feature.switch(:feature_active, -> { 1 }, -> { 2 })
expect(retval).to eq(1)
end
it 'should call the second proc/lambda if the feature is active' do
retval = Feature.switch(:feature_inactive, -> { 1 }, -> { 2 })
expect(retval).to eq(2)
end
end
end
describe 'active_features' do
it 'should return an array of active feature flags' do
expect(Feature.active_features).to eq([:feature_active])
end
end
end
end
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