128 lines
3.7 KiB
Ruby
128 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe ApplicationExperiment do
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subject { described_class.new(:stub) }
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describe "publishing results" do
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it "tracks the assignment" do
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expect(subject).to receive(:track).with(:assignment)
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subject.publish(nil)
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end
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it "pushes the experiment knowledge into the client using Gon.global" do
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expect(Gon.global).to receive(:push).with(
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{
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experiment: {
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'stub' => { # string key because it can be namespaced
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experiment: 'stub',
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key: 'e8f65fd8d973f9985dc7ea3cf1614ae1',
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variant: 'control'
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}
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}
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},
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true
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)
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subject.publish(nil)
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end
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end
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describe "tracking events", :snowplow do
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it "doesn't track if excluded" do
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subject.exclude { true }
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subject.track(:action)
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expect_no_snowplow_event
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end
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it "tracks the event with the expected arguments and merged contexts" do
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subject.track(:action, property: '_property_', context: [
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SnowplowTracker::SelfDescribingJson.new('iglu:com.gitlab/fake/jsonschema/0-0-0', { data: '_data_' })
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])
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expect_snowplow_event(
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category: 'stub',
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action: 'action',
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property: '_property_',
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context: [
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{
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schema: 'iglu:com.gitlab/fake/jsonschema/0-0-0',
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data: { data: '_data_' }
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},
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{
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schema: 'iglu:com.gitlab/gitlab_experiment/jsonschema/0-3-0',
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data: { experiment: 'stub', key: 'e8f65fd8d973f9985dc7ea3cf1614ae1', variant: 'control' }
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}
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]
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)
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end
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end
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describe "variant resolution" do
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it "returns nil when not rolled out" do
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stub_feature_flags(stub: false)
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expect(subject.variant.name).to eq('control')
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end
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context "when rolled out to 100%" do
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it "returns the first variant name" do
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subject.try(:variant1) {}
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subject.try(:variant2) {}
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expect(subject.variant.name).to eq('variant1')
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end
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end
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end
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context "when caching" do
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let(:cache) { ApplicationExperiment::Cache.new }
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before do
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cache.clear(key: subject.name)
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subject.use { } # setup the control
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subject.try { } # setup the candidate
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allow(Gitlab::Experiment::Configuration).to receive(:cache).and_return(cache)
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end
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it "caches the variant determined by the variant resolver" do
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expect(subject.variant.name).to eq('candidate') # we should be in the experiment
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subject.run
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expect(cache.read(subject.cache_key)).to eq('candidate')
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end
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it "doesn't cache a variant if we don't explicitly provide one" do
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# by not caching "empty" variants, we effectively create a mostly
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# optimal combination of caching and rollout flexibility. If we cached
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# every control variant assigned, we'd inflate the cache size and
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# wouldn't be able to roll out to subjects that we'd already assigned to
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# the control.
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stub_feature_flags(stub: false) # simulate being not rolled out
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expect(subject.variant.name).to eq('control') # if we ask, it should be control
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subject.run
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expect(cache.read(subject.cache_key)).to be_nil
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end
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it "caches a control variant if we assign it specifically" do
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# by specifically assigning the control variant here, we're guaranteeing
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# that this context will always get the control variant unless we delete
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# the field from the cache (or clear the entire experiment cache) -- or
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# write code that would specify a different variant.
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subject.run(:control)
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expect(cache.read(subject.cache_key)).to eq('control')
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end
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end
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end
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