1 files changed, 97 insertions, 0 deletions
diff --git a/spec/services/merge_requests/mergeability/detailed_merge_status_service_spec.rb b/spec/services/merge_requests/mergeability/detailed_merge_status_service_spec.rb
new file mode 100644
index 00000000000..5722bb79cc5
--- /dev/null
+++ b/spec/services/merge_requests/mergeability/detailed_merge_status_service_spec.rb
@@ -0,0 +1,97 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ::MergeRequests::Mergeability::DetailedMergeStatusService do
+  subject(:detailed_merge_status) { described_class.new(merge_request: merge_request).execute }
+
+  context 'when merge status is cannot_be_merged_rechecking' do
+    let(:merge_request) { create(:merge_request, merge_status: :cannot_be_merged_rechecking) }
+
+    it 'returns :checking' do
+      expect(detailed_merge_status).to eq(:checking)
+    end
+  end
+
+  context 'when merge status is preparing' do
+    let(:merge_request) { create(:merge_request, merge_status: :preparing) }
+
+    it 'returns :checking' do
+      expect(detailed_merge_status).to eq(:checking)
+    end
+  end
+
+  context 'when merge status is checking' do
+    let(:merge_request) { create(:merge_request, merge_status: :checking) }
+
+    it 'returns :checking' do
+      expect(detailed_merge_status).to eq(:checking)
+    end
+  end
+
+  context 'when merge status is unchecked' do
+    let(:merge_request) { create(:merge_request, merge_status: :unchecked) }
+
+    it 'returns :unchecked' do
+      expect(detailed_merge_status).to eq(:unchecked)
+    end
+  end
+
+  context 'when merge checks are a success' do
+    let(:merge_request) { create(:merge_request) }
+
+    it 'returns :mergeable' do
+      expect(detailed_merge_status).to eq(:mergeable)
+    end
+  end
+
+  context 'when merge status have a failure' do
+    let(:merge_request) { create(:merge_request) }
+
+    before do
+      merge_request.close!
+    end
+
+    it 'returns the failure reason' do
+      expect(detailed_merge_status).to eq(:not_open)
+    end
+  end
+
+  context 'when all but the ci check fails' do
+    let(:merge_request) { create(:merge_request) }
+
+    before do
+      merge_request.project.update!(only_allow_merge_if_pipeline_succeeds: true)
+    end
+
+    context 'when pipeline does not exist' do
+      it 'returns the failure reason' do
+        expect(detailed_merge_status).to eq(:ci_must_pass)
+      end
+    end
+
+    context 'when pipeline exists' do
+      before do
+        create(:ci_pipeline, ci_status, merge_request: merge_request,
+                                        project: merge_request.project, sha: merge_request.source_branch_sha,
+                                        head_pipeline_of: merge_request)
+      end
+
+      context 'when the pipeline is running' do
+        let(:ci_status) { :running }
+
+        it 'returns the failure reason' do
+          expect(detailed_merge_status).to eq(:ci_still_running)
+        end
+      end
+
+      context 'when the pipeline is not running' do
+        let(:ci_status) { :failed }
+
+        it 'returns the failure reason' do
+          expect(detailed_merge_status).to eq(:ci_must_pass)
+        end
+      end
+    end
+  end
+end