Respond with validation errors in commit status API

lib/api/commit_statuses.rb

@@ -78,6 +78,8 @@ module API
           description: params[:description]
         )
 
+        render_validation_error!(status) if status.invalid?
+
         begin
           case params[:state]
           when 'pending'

spec/requests/api/commit_statuses_spec.rb

@@ -172,7 +172,7 @@ describe API::CommitStatuses, api: true do
         end
       end
 
-      context 'invalid status' do
+      context 'when status is invalid' do
         before { post api(post_url, developer), state: 'invalid' }
 
         it 'does not create commit status' do
@@ -180,7 +180,7 @@ describe API::CommitStatuses, api: true do
         end
       end
 
-      context 'request without state' do
+      context 'when request without a state made' do
         before { post api(post_url, developer) }
 
         it 'does not create commit status' do
@@ -188,7 +188,7 @@ describe API::CommitStatuses, api: true do
         end
       end
 
-      context 'invalid commit' do
+      context 'when commit SHA is invalid' do
         let(:sha) { 'invalid_sha' }
         before { post api(post_url, developer), state: 'running' }
 
@@ -196,6 +196,19 @@ describe API::CommitStatuses, api: true do
           expect(response).to have_http_status(404)
         end
       end
+
+      context 'when target URL is an invalid address' do
+        before do
+          post api(post_url, developer), state: 'pending',
+                                         target_url: 'invalid url'
+        end
+
+        it 'responds with bad request status and validation errors' do
+          expect(response).to have_http_status(400)
+          expect(json_response['message']['target_url'])
+            .to include 'must be a valid URL'
+        end
+      end
     end
 
     context 'reporter user' do