Improve style, add more tests

changelogs/unreleased/zj-slash-commands-mattermost.yml

 ---
-title: Add first slash commands
+title: Added Mattermost slash command
 merge_request: 7438
 author: 

lib/api/helpers.rb

@@ -85,20 +85,11 @@ module API
       end
     end
 
-    def project_service
-      @project_service ||= user_project.find_or_initialize_service(params[:service_slug].underscore)
+    def project_service(project = user_project)
+      @project_service ||= project.find_or_initialize_service(params[:service_slug].underscore)
       @project_service || not_found!("Service")
     end
 
-    def service_by_slug(project, slug)
-      underscored_service = slug.underscore
-
-      not_found!('Service') unless Service.available_services_names.include?(underscored_service)
-      service_method = "#{underscored_service}_service"
-
-      service = project.public_send(service_method)
-    end
-
     def service_attributes
       @service_attributes ||= project_service.fields.inject([]) do |arr, hash|
         arr << hash[:name].to_sym

lib/api/services.rb

@@ -67,7 +67,9 @@ module API
       post ':id/services/:service_slug/trigger' do
         project = Project.find_with_namespace(params[:id]) || Project.find_by(id: params[:id])
 
-        service = service_by_slug(project, params[:service_slug])
+        not_found! unless project
+
+        service = project_service(project)
 
         result = service.try(:active?) && service.try(:trigger, params)
 
@@ -75,7 +77,7 @@ module API
           status result[:status] || 200
           present result
         else
-          not_found!('Service')
+          not_found!
         end
       end
     end

lib/gitlab/chat_commands/base_command.rb

@@ -3,7 +3,7 @@ module Gitlab
     class BaseCommand
       QUERY_LIMIT = 5
 
-      def self.match(_)
+      def self.match(_text)
         raise NotImplementedError
       end
 
@@ -11,11 +11,11 @@ module Gitlab
         raise NotImplementedError
       end
 
-      def self.available?(_)
+      def self.available?(_project)
         raise NotImplementedError
       end
 
-      def self.allowed?(_, _)
+      def self.allowed?(_user, _ability)
         true
       end
 

lib/mattermost/presenter.rb

 module Mattermost
   class Presenter
     class << self
-      include Rails.application.routes.url_helpers
+      include Gitlab::Routing.url_helpers
 
       def authorize_chat_name(url)
         message = if url
@@ -14,7 +14,7 @@ module Mattermost
       end
 
       def help(commands, trigger)
-        if commands.count == 0
+        if commands.empty?
           ephemeral_response("No commands configured") unless messages.count > 1
         else
           message = header_with_list("Available commands", commands)
@@ -50,7 +50,7 @@ module Mattermost
       end
 
       def single_resource(resource)
-        return error(resource) if resource.errors.any?
+        return error(resource) if resource.errors.any? || !resource.persisted?
 
         message = "### #{title(resource)}"
         message << "\n\n#{resource.description}" if resource.description

spec/lib/gitlab/chat_commands/command_spec.rb

@@ -7,7 +7,7 @@ describe Gitlab::ChatCommands::Command, service: true do
   subject { described_class.new(project, user, params).execute }
 
   describe '#execute' do
-    context 'when no command is not available' do
+    context 'when no command is available' do
       let(:params) { { text: 'issue show 1' } }
       let(:project) { create(:project, has_external_issue_tracker: true) }
 
@@ -45,6 +45,10 @@ describe Gitlab::ChatCommands::Command, service: true do
       it 'presents the issue' do
         expect(subject[:text]).to match("my new issue")
       end
+
+      it 'shows a link to the new issue' do
+        expect(subject[:text]).to match(/\/issues\/\d+/)
+      end
     end
   end
 end

spec/lib/gitlab/chat_commands/issue_create_spec.rb

@@ -34,7 +34,7 @@ describe Gitlab::ChatCommands::IssueCreate, service: true do
     end
   end
 
-  describe 'self.match' do
+  describe '.match' do
     it 'matches the title without description' do
       match = described_class.match("issue create my title")
 

spec/lib/gitlab/import_export/all_models.yml

@@ -116,6 +116,7 @@ project:
 - base_tags
 - tag_taggings
 - tags
+- chat_services
 - creator
 - group
 - namespace
@@ -127,6 +128,7 @@ project:
 - emails_on_push_service
 - builds_email_service
 - pipelines_email_service
+- mattermost_command_service
 - irker_service
 - pivotaltracker_service
 - hipchat_service

spec/requests/api/services_spec.rb

@@ -102,6 +102,8 @@ describe API::API, api: true  do
     end
 
     context 'the service exists' do
+      let(:params) { { token: 'token' } }
+
       context 'the service is not active' do
         let!(:inactive_service) do
           project.create_mattermost_command_service(
@@ -124,7 +126,6 @@ describe API::API, api: true  do
             properties: { token: 'token' }
           )
         end
-        let(:params) { { token: 'token' } }
 
         it 'retusn status 200' do
           post api("/projects/#{project.id}/services/mattermost_command/trigger"), params
@@ -132,6 +133,15 @@ describe API::API, api: true  do
           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_command/trigger"), params
+
+          expect(response).to have_http_status(404)
+          expect(json_response["message"]).to eq '404 Not Found'
+        end
+      end
     end
   end
 end