E2E test delete pipeline via API

qa/qa/specs/features/api/4_verify/pipeline_deletion_spec.rb

+# frozen_string_literal: true
+
+module QA
+  RSpec.describe 'Verify' do
+    include Support::Api
+
+    let(:api_client) { Runtime::API::Client.new(:gitlab) }
+
+    describe 'Pipeline', :runner do
+      let(:project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.name = 'project-with-pipeline'
+        end
+      end
+
+      let!(:runner) do
+        Resource::Runner.fabricate! do |runner|
+          runner.project = project
+          runner.name = project.name
+          runner.tags = [project.name]
+        end
+      end
+
+      let!(:ci_file) do
+        Resource::Repository::Commit.fabricate_via_api! do |commit|
+          commit.project = project
+          commit.commit_message = 'Add .gitlab-ci.yml'
+          commit.add_files(
+            [
+                {
+                    file_path: '.gitlab-ci.yml',
+                    content: <<~YAML
+                      job1:
+                        tags:
+                          - #{project.name}
+                        script: echo 'OK'
+                    YAML
+                }
+            ]
+          )
+        end
+      end
+
+      let!(:pipeline_id) do
+        pipeline_create_request = Runtime::API::Request.new(api_client, "/projects/#{project.id}/pipeline?ref=master")
+        JSON.parse(post(pipeline_create_request.url, nil))['id']
+      end
+
+      let(:pipeline_data_request) { Runtime::API::Request.new(api_client, "/projects/#{project.id}/pipelines/#{pipeline_id}") }
+
+      after do
+        runner.remove_via_api!
+      end
+
+      context 'when deleted via API' do
+        it 'is not found' do
+          delete(pipeline_data_request.url)
+          expect(JSON.parse(get(pipeline_data_request.url))['message'].downcase).to have_content('404 not found')
+        end
+      end
+    end
+  end
+end