Merge branch 'zj-slash-commands-mattermost' into 'master'

Slash command for mattermost

Closes  #22540

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)


See merge request !7438

1 files changed, 57 insertions, 0 deletions

diff --git a/spec/requests/api/services_spec.rb b/spec/requests/api/services_spec.rb
index 2aadab3cbe1..ce9c96ace21 100644
--- a/spec/requests/api/services_spec.rb
+++ b/spec/requests/api/services_spec.rb
@@ -88,4 +88,61 @@ describe API::API, api: true  do
       end
     end
   end
+
+  describe 'POST /projects/:id/services/:slug/trigger' do
+    let!(:project) { create(:empty_project) }
+    let(:service_name) { 'mattermost_slash_commands' }
+
+    context 'no service is available' do
+      it 'returns a not found message' do
+        post api("/projects/#{project.id}/services/idonotexist/trigger")
+
+        expect(response).to have_http_status(404)
+        expect(json_response["message"]).to eq("404 Service Not Found")
+      end
+    end
+
+    context 'the service exists' do
+      let(:params) { { token: 'token' } }
+
+      context 'the service is not active' do
+        let!(:inactive_service) do
+          project.create_mattermost_slash_commands_service(
+            active: false,
+            properties: { token: 'token' }
+          )
+        end
+
+        it 'when the service is inactive' do
+          post api("/projects/#{project.id}/services/mattermost_slash_commands/trigger")
+
+          expect(response).to have_http_status(404)
+        end
+      end
+
+      context 'the service is active' do
+        let!(:active_service) do
+          project.create_mattermost_slash_commands_service(
+            active: true,
+            properties: { token: 'token' }
+          )
+        end
+
+        it 'retusn status 200' do
+          post api("/projects/#{project.id}/services/mattermost_slash_commands/trigger"), params
+
+          expect(response).to have_http_status(200)
+        end
+      end
+
+      context 'when the project can not be found' do
+        it 'returns a generic 404' do
+          post api("/projects/404/services/mattermost_slash_commands/trigger"), params
+
+          expect(response).to have_http_status(404)
+          expect(json_response["message"]).to eq("404 Service Not Found")
+        end
+      end
+    end
+  end
 end