Call snowplow for gitlab-experiment specs

Snowplow checks types at runtime and therefore could lead to failures
when using the wrong type for an event tracking property.
We already call the original method in specs when `:snowplow` tag is
used, but haven't so far for the custom rspec methods from
`gitlab-experiment` gem.

spec/support/gitlab_experiment.rb

@@ -2,6 +2,7 @@
 
 # Require the provided spec helper and matchers.
 require 'gitlab/experiment/rspec'
+require_relative 'stub_snowplow'
 
 # This is a temporary fix until we have a larger discussion around the
 # challenges raised in https://gitlab.com/gitlab-org/gitlab/-/issues/300104
@@ -10,11 +11,21 @@ class ApplicationExperiment # rubocop:disable Gitlab/NamespacedClass
     super(...)
     Feature.persist_used!(feature_flag_name)
   end
+
+  def should_track?
+    true
+  end
 end
 
 RSpec.configure do |config|
+  config.include StubSnowplow, :experiment
+
   # Disable all caching for experiments in tests.
   config.before do
     allow(Gitlab::Experiment::Configuration).to receive(:cache).and_return(nil)
   end
+
+  config.before(:each, :experiment) do
+    stub_snowplow
+  end
 end

spec/support/snowplow.rb

 # frozen_string_literal: true
 
+require_relative 'stub_snowplow'
+
 RSpec.configure do |config|
   config.include SnowplowHelpers, :snowplow
+  config.include StubSnowplow, :snowplow
 
   config.before(:each, :snowplow) do
-    # Using a high buffer size to not cause early flushes
-    buffer_size = 100
-    # WebMock is set up to allow requests to `localhost`
-    host = 'localhost'
-
-    allow_any_instance_of(Gitlab::Tracking::Destinations::ProductAnalytics).to receive(:event)
-
-    allow_any_instance_of(Gitlab::Tracking::Destinations::Snowplow)
-      .to receive(:emitter)
-      .and_return(SnowplowTracker::Emitter.new(host, buffer_size: buffer_size))
-
-    stub_application_setting(snowplow_enabled: true)
-
-    allow(SnowplowTracker::SelfDescribingJson).to receive(:new).and_call_original
-    allow(Gitlab::Tracking).to receive(:event).and_call_original # rubocop:disable RSpec/ExpectGitlabTracking
+    stub_snowplow
   end
 
   config.after(:each, :snowplow) do

spec/support/stub_snowplow.rb

+# frozen_string_literal: true
+
+module StubSnowplow
+  def stub_snowplow
+    # Using a high buffer size to not cause early flushes
+    buffer_size = 100
+    # WebMock is set up to allow requests to `localhost`
+    host = 'localhost'
+
+    # rubocop:disable RSpec/AnyInstanceOf
+    allow_any_instance_of(Gitlab::Tracking::Destinations::ProductAnalytics).to receive(:event)
+
+    allow_any_instance_of(Gitlab::Tracking::Destinations::Snowplow)
+      .to receive(:emitter)
+      .and_return(SnowplowTracker::Emitter.new(host, buffer_size: buffer_size))
+    # rubocop:enable RSpec/AnyInstanceOf
+
+    stub_application_setting(snowplow_enabled: true)
+
+    allow(SnowplowTracker::SelfDescribingJson).to receive(:new).and_call_original
+    allow(Gitlab::Tracking).to receive(:event).and_call_original # rubocop:disable RSpec/ExpectGitlabTracking
+  end
+end