Use describe rather than context for this:

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4964/diffs#note_12867416

Guidelines:
https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/testing.md#general-guidelines

> Use `context` to test branching logic.

spec/requests/ci/api/builds_spec.rb

@@ -293,7 +293,7 @@ describe Ci::API::API do
             allow(ArtifactUploader).to receive(:artifacts_upload_path).and_return('/')
           end
 
-          context 'build has been erased' do
+          describe 'build has been erased' do
             let(:build) { create(:ci_build, erased_at: Time.now) }
 
             before do