fix: err if gitlab shas dont match (#5)

* fix: gitlab update status should return error if the shas dont match

* test: add real sha to tests

* test: add the sha to the mock server too

server/events/vcs/gitlab_client.go

@@ -413,13 +413,13 @@ func (g *GitlabClient) UpdateStatus(logger logging.SimpleLogging, repo models.Re
 			return err
 		}
 		if mr.HeadPipeline != nil {
-			logger.Info("Head pipeline found for merge request %d, source '%s'. pipelineID '%s'",
+			logger.Info("Head pipeline found for merge request %d, source '%s'. pipelineID '%d'",
 				pull.Num, mr.HeadPipeline.Source, mr.HeadPipeline.ID)
 			pipelineID = gitlab.Ptr(mr.HeadPipeline.ID)
 
-			// let's check to see if the pipeline sha matches the head commit.
+			// if these don't match then there has been a new commit so let's return
 			if mr.HeadPipeline.SHA != pull.HeadCommit {
-				logger.Err("Head pipeline SHA does not match pull head commit")
+				return errors.Errorf("mr.HeadPipeline.SHA: '%s' does not match pull.HeadCommit '%s'", mr.HeadPipeline.SHA, pull.HeadCommit)
 			}
 			break
 		}

server/events/vcs/gitlab_client_test.go

@@ -298,7 +298,7 @@ func TestGitlabClient_UpdateStatus(t *testing.T) {
 			testServer := httptest.NewServer(
 				http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 					switch r.RequestURI {
-					case "/api/v4/projects/runatlantis%2Fatlantis/statuses/sha":
+					case "/api/v4/projects/runatlantis%2Fatlantis/statuses/67cb91d3f6198189f433c045154a885784ba6977":
 						gotRequest = true
 
 						body, err := io.ReadAll(r.Body)
@@ -337,7 +337,7 @@ func TestGitlabClient_UpdateStatus(t *testing.T) {
 				models.PullRequest{
 					Num:        1,
 					BaseRepo:   repo,
-					HeadCommit: "sha",
+					HeadCommit: "67cb91d3f6198189f433c045154a885784ba6977",
 					HeadBranch: "test",
 				}, c.status, "src", "description", "https://google.com")
 			Ok(t, err)