Make it possible to fabricate environment on branch

spec/factories/environments.rb

@@ -8,16 +8,21 @@
     trait :with_review_app do |environment|
       project
+      transient do
+        ref 'master'
+      end
+
       # At this point `review app` is an ephemeral concept related to
       # deployments being deployed for given environment. There is no
       # first-class `review app` available so we need to create set of
       # interconnected objects to simulate a review app.
       #
-      after(:create) do |environment|
+      after(:create) do |environment, evaluator|
         deployment = create(:deployment,
                             environment: environment,
                             project: environment.project,
-                            sha: environment.project.commit.id)
+                            ref: evaluator.ref,
+                            sha: environment.project.commit(evaluator.ref).id)
         teardown_build = create(:ci_build, :manual,
                                 name: "#{deployment.environment.name}:teardown",

spec/services/ci/stop_environments_service_spec.rb

@@ -9,7 +9,8 @@
   describe '#execute' do
     context 'when environment with review app exists' do
       before do
-        create(:environment, :with_review_app, project: project)
+        create(:environment, :with_review_app, project: project,
+                                               ref: 'feature')
       end
       context 'when user has permission to stop environment' do
@@ -17,8 +18,16 @@
           project.team << [user, :developer]
         end
-        it 'stops environment' do
-          expect_environment_stopped_on('master')
+        context 'when environment is associated with removed branch' do
+          it 'stops environment' do
+            expect_environment_stopped_on('feature')
+          end
+        end
+
+        context 'when environment is associated with different branch' do
+          it 'does not stop environment' do
+            expect_environment_not_stopped_on('master')
+          end
         end
         context 'when specified branch does not exist' do
@@ -40,7 +49,7 @@
           end
           it 'does not stop environment' do
-            expect_environment_not_stopped_on('master')
+            expect_environment_not_stopped_on('feature')
           end
         end
       end