Add timed incremental rollout to Auto DevOps

Auto DevOps deployment strategies now supports timed incremental
rollout. We are deprecating the usage of INCREMENTAL_ROLLOUT_ENABLED
environment variable in Auto DevOps template.

The new behavior will be driven by the INCREMENTAL_ROLLOUT_MODE variable
that can either be manual (same as INCREMENTAL_ROLLOUT_ENABLED) or
timed.

Rollout deployments will be executed using a 5 minute delay between each
job.

2 files changed, 27 insertions, 12 deletions

diff --git a/spec/factories/project_auto_devops.rb b/spec/factories/project_auto_devops.rb
index b77f702f9e1..75ac7cc7687 100644
--- a/spec/factories/project_auto_devops.rb
+++ b/spec/factories/project_auto_devops.rb
@@ -5,8 +5,16 @@ FactoryBot.define do
     domain "example.com"
     deploy_strategy :continuous
 
-    trait :manual do
-      deploy_strategy :manual
+    trait :continuous_deployment do
+      deploy_strategy ProjectAutoDevops.deploy_strategies[:continuous] # rubocop:disable FactoryBot/DynamicAttributeDefinedStatically
+    end
+
+    trait :manual_deployment do
+      deploy_strategy ProjectAutoDevops.deploy_strategies[:manual] # rubocop:disable FactoryBot/DynamicAttributeDefinedStatically
+    end
+
+    trait :timed_incremental_deployment do
+      deploy_strategy ProjectAutoDevops.deploy_strategies[:timed_incremental] # rubocop:disable FactoryBot/DynamicAttributeDefinedStatically
     end
 
     trait :disabled do
diff --git a/spec/models/project_auto_devops_spec.rb b/spec/models/project_auto_devops_spec.rb
index 797d767465a..342798f730b 100644
--- a/spec/models/project_auto_devops_spec.rb
+++ b/spec/models/project_auto_devops_spec.rb
@@ -70,24 +70,31 @@ describe ProjectAutoDevops do
     end
 
     context 'when deploy_strategy is manual' do
-      let(:domain) { 'example.com' }
-
-      before do
-        auto_devops.deploy_strategy = 'manual'
+      let(:auto_devops) { build_stubbed(:project_auto_devops, :manual_deployment, project: project) }
+      let(:expected_variables) do
+        [
+          { key: 'INCREMENTAL_ROLLOUT_MODE', value: 'manual' },
+          { key: 'STAGING_ENABLED', value: '1' },
+          { key: 'INCREMENTAL_ROLLOUT_ENABLED', value: '1' }
+        ]
       end
 
+      it { expect(auto_devops.predefined_variables).to include(*expected_variables) }
+    end
+
+    context 'when deploy_strategy is continuous' do
+      let(:auto_devops) { build_stubbed(:project_auto_devops, :continuous_deployment, project: project) }
+
       it do
         expect(auto_devops.predefined_variables.map { |var| var[:key] })
-          .to include("STAGING_ENABLED", "INCREMENTAL_ROLLOUT_ENABLED")
+          .not_to include("STAGING_ENABLED", "INCREMENTAL_ROLLOUT_ENABLED")
       end
     end
 
-    context 'when deploy_strategy is continuous' do
-      let(:domain) { 'example.com' }
+    context 'when deploy_strategy is timed_incremental' do
+      let(:auto_devops) { build_stubbed(:project_auto_devops, :timed_incremental_deployment, project: project) }
 
-      before do
-        auto_devops.deploy_strategy = 'continuous'
-      end
+      it { expect(auto_devops.predefined_variables).to include(key: 'INCREMENTAL_ROLLOUT_MODE', value: 'timed') }
 
       it do
         expect(auto_devops.predefined_variables.map { |var| var[:key] })