Add tests for yaml content with errors

spec/requests/api/lint_spec.rb

@@ -3,15 +3,13 @@ require 'spec_helper'
 describe API::API do
   include ApiHelpers
 
-  let(:user) { create(:user) }
   let(:yaml_content) do
     File.read(Rails.root.join('spec/support/gitlab_stubs/gitlab_ci.yml'))
   end
 
   describe 'POST /lint' do
     context 'with valid .gitlab-ci.yaml content' do
-      context 'authorized user' do
-        it 'validate content' do
+      it 'validates content' do
         post api('/lint'), { content: yaml_content }
 
         expect(response).to have_http_status(200)
@@ -19,14 +17,22 @@ describe API::API do
         expect(json_response['status']).to eq('valid')
       end
     end
-    end
 
-    context 'with invalid .gitlab_ci.yml content' do
-      it 'validate content' do
+    context 'with invalid .gitlab_ci.yml' do
+      it 'validates content and shows correct errors' do
         post api('/lint'), { content: 'invalid content' }
 
         expect(response).to have_http_status(200)
         expect(json_response['status']).to eq('invalid')
+        expect(json_response['errors']).to eq(['Invalid configuration format'])
+      end
+
+      it "validates content and shows configuration error" do
+        post api('/lint'), { content: '{ image: "ruby:2.1",  services: ["postgres"] }' }
+
+        expect(response).to have_http_status(200)
+        expect(json_response['status']).to eq('invalid')
+        expect(json_response['errors']).to eq(['jobs config should contain at least one visible job'])
       end
     end