1 files changed, 56 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/project/jobs_spec.rb b/spec/requests/api/graphql/project/jobs_spec.rb
new file mode 100644
index 00000000000..1a823ede9ac
--- /dev/null
+++ b/spec/requests/api/graphql/project/jobs_spec.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe 'Query.project.jobs' do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project, :repository, :public) }
+  let_it_be(:user) { create(:user) }
+
+  let(:pipeline) do
+    create(:ci_pipeline, project: project, user: user)
+  end
+
+  let(:query) do
+    <<~QUERY
+    {
+      project(fullPath: "#{project.full_path}") {
+        jobs {
+          nodes {
+            name
+            previousStageJobsAndNeeds {
+              nodes {
+                name
+              }
+            }
+          }
+        }
+      }
+    }
+    QUERY
+  end
+
+  it 'does not generate N+1 queries', :request_store, :use_sql_query_cache do
+    build_stage = create(:ci_stage_entity, position: 1, name: 'build', project: project, pipeline: pipeline)
+    test_stage = create(:ci_stage_entity, position: 2, name: 'test', project: project, pipeline: pipeline)
+    create(:ci_build, pipeline: pipeline, stage_idx: build_stage.position, name: 'docker 1 2', stage: build_stage)
+    create(:ci_build, pipeline: pipeline, stage_idx: build_stage.position, name: 'docker 2 2', stage: build_stage)
+    create(:ci_build, pipeline: pipeline, stage_idx: test_stage.position, name: 'rspec 1 2', stage: test_stage)
+    test_job = create(:ci_build, pipeline: pipeline, stage_idx: test_stage.position, name: 'rspec 2 2', stage: test_stage)
+    create(:ci_build_need, build: test_job, name: 'docker 1 2')
+
+    post_graphql(query, current_user: user)
+
+    control = ActiveRecord::QueryRecorder.new(skip_cached: false) do
+      post_graphql(query, current_user: user)
+    end
+
+    create(:ci_build, name: 'test-a', stage: test_stage, stage_idx: test_stage.position, pipeline: pipeline)
+    test_b_job = create(:ci_build, name: 'test-b', stage: test_stage, stage_idx: test_stage.position, pipeline: pipeline)
+    create(:ci_build_need, build: test_b_job, name: 'docker 2 2')
+
+    expect do
+      post_graphql(query, current_user: user)
+    end.not_to exceed_all_query_limit(control)
+  end
+end