Change `be_success` to `be_successful` in specs

Fixes deprecation warning:

```
DEPRECATION WARNING: The success? predicate is deprecated and
will be removed in Rails 6.0.
Please use successful? as provided by Rack::Response::Helpers.
```

spec/controllers/groups/group_members_controller_spec.rb

@@ -172,7 +172,7 @@ describe Groups::GroupMembersController do
         it '[JS] removes user from members' do
           delete :destroy, params: { group_id: group, id: member }, xhr: true
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(group.members).not_to include member
         end
       end

spec/controllers/groups/milestones_controller_spec.rb

@@ -186,7 +186,7 @@ describe Groups::MilestonesController do
     it "removes milestone" do
       delete :destroy, params: { group_id: group.to_param, id: milestone.iid }, format: :js
 
-      expect(response).to be_success
+      expect(response).to be_successful
       expect { Milestone.find(milestone.id) }.to raise_exception(ActiveRecord::RecordNotFound)
     end
   end

spec/controllers/health_check_controller_spec.rb

@@ -33,14 +33,14 @@ describe HealthCheckController do
 
           get :index
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(response.content_type).to eq 'text/plain'
         end
 
         it 'supports passing the token in query params' do
           get :index, params: { token: token }
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(response.content_type).to eq 'text/plain'
         end
       end
@@ -54,14 +54,14 @@ describe HealthCheckController do
       it 'supports successful plaintext response' do
         get :index
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(response.content_type).to eq 'text/plain'
       end
 
       it 'supports successful json response' do
         get :index, format: :json
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(response.content_type).to eq 'application/json'
         expect(json_response['healthy']).to be true
       end
@@ -69,7 +69,7 @@ describe HealthCheckController do
       it 'supports successful xml response' do
         get :index, format: :xml
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(response.content_type).to eq 'application/xml'
         expect(xml_response['healthy']).to be true
       end
@@ -77,7 +77,7 @@ describe HealthCheckController do
       it 'supports successful responses for specific checks' do
         get :index, params: { checks: 'email' }, format: :json
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(response.content_type).to eq 'application/json'
         expect(json_response['healthy']).to be true
       end

spec/controllers/help_controller_spec.rb

@@ -114,7 +114,7 @@ describe HelpController do
                 path: 'user/project/img/labels_default_v12_1'
               },
               format: :png
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(response.content_type).to eq 'image/png'
           expect(response.headers['Content-Disposition']).to match(/^inline;/)
         end

spec/controllers/profiles/keys_controller_spec.rb

@@ -10,7 +10,7 @@ describe Profiles::KeysController do
       it "does not generally work" do
         get :get_keys, params: { username: 'not-existent' }
 
-        expect(response).not_to be_success
+        expect(response).not_to be_successful
       end
     end
 
@@ -18,7 +18,7 @@ describe Profiles::KeysController do
       it "does generally work" do
         get :get_keys, params: { username: user.username }
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       it "renders all keys separated with a new line" do
@@ -41,7 +41,7 @@ describe Profiles::KeysController do
       it "does generally work" do
         get :get_keys, params: { username: user.username }
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       it "renders all non deploy keys separated with a new line" do

spec/controllers/projects/ci/lints_controller_spec.rb

@@ -20,9 +20,7 @@ describe Projects::Ci::LintsController do
         get :show, params: { namespace_id: project.namespace, project_id: project }
       end
 
-      it 'is success' do
-        expect(response).to be_success
-      end
+      it { expect(response).to be_successful }
 
       it 'renders show page' do
         expect(response).to render_template :show
@@ -78,9 +76,7 @@ describe Projects::Ci::LintsController do
         post :create, params: { namespace_id: project.namespace, project_id: project, content: content }
       end
 
-      it 'is success' do
-        expect(response).to be_success
-      end
+      it { expect(response).to be_successful }
 
       it 'render show page' do
         expect(response).to render_template :show

spec/controllers/projects/commit_controller_spec.rb

@@ -45,14 +45,14 @@ describe Projects::CommitController do
     it 'handles binary files' do
       go(id: TestEnv::BRANCH_SHA['binary-encoding'], format: 'html')
 
-      expect(response).to be_success
+      expect(response).to be_successful
     end
 
     shared_examples "export as" do |format|
       it "does generally work" do
         go(id: commit.id, format: format)
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       it "generates it" do
@@ -110,7 +110,7 @@ describe Projects::CommitController do
               id: commit.id
             })
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
     end
 
@@ -177,7 +177,7 @@ describe Projects::CommitController do
               id: commit.id
             })
 
-        expect(response).not_to be_success
+        expect(response).not_to be_successful
         expect(response).to have_gitlab_http_status(404)
       end
     end
@@ -234,7 +234,7 @@ describe Projects::CommitController do
               id: master_pickable_commit.id
             })
 
-        expect(response).not_to be_success
+        expect(response).not_to be_successful
         expect(response).to have_gitlab_http_status(404)
       end
     end

spec/controllers/projects/commits_controller_spec.rb

@@ -79,7 +79,7 @@ describe Projects::CommitsController do
           end
 
           it "renders as atom" do
-            expect(response).to be_success
+            expect(response).to be_successful
             expect(response.content_type).to eq('application/atom+xml')
           end
 
@@ -104,7 +104,7 @@ describe Projects::CommitsController do
           end
 
           it "renders as HTML" do
-            expect(response).to be_success
+            expect(response).to be_successful
             expect(response.content_type).to eq('text/html')
           end
         end

spec/controllers/projects/compare_controller_spec.rb

@@ -19,7 +19,7 @@ describe Projects::CompareController do
     end
 
     it 'returns successfully' do
-      expect(response).to be_success
+      expect(response).to be_successful
     end
   end
 
@@ -49,7 +49,7 @@ describe Projects::CompareController do
         it 'shows some diffs with ignore whitespace change option' do
           show_request
 
-          expect(response).to be_success
+          expect(response).to be_successful
           diff_file = assigns(:diffs).diff_files.first
           expect(diff_file).not_to be_nil
           expect(assigns(:commits).length).to be >= 1
@@ -67,7 +67,7 @@ describe Projects::CompareController do
         it 'sets the diffs and commits ivars' do
           show_request
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(assigns(:diffs).diff_files.first).not_to be_nil
           expect(assigns(:commits).length).to be >= 1
         end
@@ -81,7 +81,7 @@ describe Projects::CompareController do
       it 'sets empty diff and commit ivars' do
         show_request
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(assigns(:diffs)).to eq([])
         expect(assigns(:commits)).to eq([])
       end
@@ -94,7 +94,7 @@ describe Projects::CompareController do
       it 'sets empty diff and commit ivars' do
         show_request
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(assigns(:diffs)).to eq([])
         expect(assigns(:commits)).to eq([])
       end

spec/controllers/projects/cycle_analytics/events_controller_spec.rb

@@ -16,7 +16,7 @@ describe Projects::CycleAnalytics::EventsController do
       it 'is empty' do
         get_issue
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(JSON.parse(response.body)['events']).to be_empty
       end
     end
@@ -32,7 +32,7 @@ describe Projects::CycleAnalytics::EventsController do
       it 'is not empty' do
         get_issue
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       it 'contains event detais' do
@@ -49,7 +49,7 @@ describe Projects::CycleAnalytics::EventsController do
         it 'is empty' do
           get_issue(additional_params: { cycle_analytics: { start_date: 7 } })
 
-          expect(response).to be_success
+          expect(response).to be_successful
 
           expect(JSON.parse(response.body)['events']).to be_empty
         end

spec/controllers/projects/cycle_analytics_controller_spec.rb

@@ -21,7 +21,7 @@ describe Projects::CycleAnalyticsController do
             project_id: project
           })
 
-      expect(response).to be_success
+      expect(response).to be_successful
     end
   end
 
@@ -34,7 +34,7 @@ describe Projects::CycleAnalyticsController do
               project_id: project
             })
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(assigns(:cycle_analytics_no_data)).to eq(true)
       end
     end
@@ -55,7 +55,7 @@ describe Projects::CycleAnalyticsController do
               project_id: project
             })
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(assigns(:cycle_analytics_no_data)).to eq(false)
       end
     end

spec/controllers/projects/merge_requests/creations_controller_spec.rb

@@ -28,7 +28,7 @@ describe Projects::MergeRequests::CreationsController do
       it 'renders new merge request widget template' do
         get :new, params: get_diff_params
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
     end
 
@@ -56,7 +56,7 @@ describe Projects::MergeRequests::CreationsController do
         it 'limits total commits' do
           get :new, params: large_diff_params
 
-          expect(response).to be_success
+          expect(response).to be_successful
 
           total = assigns(:total_commit_count)
           expect(assigns(:commits)).to be_an Array
@@ -70,7 +70,7 @@ describe Projects::MergeRequests::CreationsController do
       it 'shows total commits' do
         get :new, params: large_diff_params
 
-        expect(response).to be_success
+        expect(response).to be_successful
 
         total = assigns(:total_commit_count)
         expect(assigns(:commits)).to be_an CommitCollection
@@ -89,7 +89,7 @@ describe Projects::MergeRequests::CreationsController do
 
         get :diffs, params: get_diff_params.merge(format: 'json')
 
-        expect(response).to be_success
+        expect(response).to be_successful
         expect(assigns[:diffs]).to be_nil
       end
     end

spec/controllers/projects/merge_requests/diffs_controller_spec.rb

@@ -66,7 +66,7 @@ describe Projects::MergeRequests::DiffsController do
         end
 
         it 'renders' do
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(response.body).to have_content('Subproject commit')
         end
       end

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -57,7 +57,7 @@ describe Projects::MergeRequestsController do
 
           go(format: :html)
 
-          expect(response).to be_success
+          expect(response).to be_successful
         end
       end
 
@@ -66,7 +66,7 @@ describe Projects::MergeRequestsController do
 
         go(format: :html)
 
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       context "that is invalid" do
@@ -75,7 +75,7 @@ describe Projects::MergeRequestsController do
         it "renders merge request page" do
           go(format: :html)
 
-          expect(response).to be_success
+          expect(response).to be_successful
         end
       end
     end
@@ -124,7 +124,7 @@ describe Projects::MergeRequestsController do
         it "renders merge request page" do
           go(format: :json)
 
-          expect(response).to be_success
+          expect(response).to be_successful
         end
       end
     end

spec/controllers/projects/milestones_controller_spec.rb

@@ -139,7 +139,7 @@ describe Projects::MilestonesController do
       expect(issue.milestone_id).to eq(milestone.id)
 
       delete :destroy, params: { namespace_id: project.namespace.id, project_id: project.id, id: milestone.iid }, format: :js
-      expect(response).to be_success
+      expect(response).to be_successful
 
       expect(Event.recent.first.action).to eq(Event::DESTROYED)
 

spec/controllers/projects/project_members_controller_spec.rb

@@ -158,7 +158,7 @@ describe Projects::ProjectMembersController do
             id: member
           }, xhr: true
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(project.members).not_to include member
         end
       end

spec/controllers/projects/refs_controller_spec.rb

@@ -49,7 +49,7 @@ describe Projects::RefsController do
       expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
 
       xhr_get(:js)
-      expect(response).to be_success
+      expect(response).to be_successful
     end
 
     it 'renders JSON' do
@@ -57,7 +57,7 @@ describe Projects::RefsController do
 
       xhr_get(:json)
 
-      expect(response).to be_success
+      expect(response).to be_successful
       expect(json_response).to be_kind_of(Array)
     end
   end

spec/controllers/projects/services_controller_spec.rb

@@ -159,7 +159,7 @@ describe Projects::ServicesController do
 
     context 'with approved services' do
       it 'renders edit page' do
-        expect(response).to be_success
+        expect(response).to be_successful
       end
     end
   end

spec/controllers/users_controller_spec.rb

@@ -19,7 +19,7 @@ describe UsersController do
         it 'renders the show template' do
           get :show, params: { username: user.username }
 
-          expect(response).to be_success
+          expect(response).to be_successful
           expect(response).to render_template('show')
         end
       end
@@ -362,7 +362,7 @@ describe UsersController do
             it 'responds with success' do
               get :show, params: { username: user.username }
 
-              expect(response).to be_success
+              expect(response).to be_successful
             end
           end
 
@@ -418,7 +418,7 @@ describe UsersController do
             it 'responds with success' do
               get :projects, params: { username: user.username }
 
-              expect(response).to be_success
+              expect(response).to be_successful
             end
           end
 

spec/support/shared_examples/controllers/external_authorization_service_shared_examples.rb

@@ -8,7 +8,7 @@ shared_examples 'disabled when using an external authorization service' do
   it 'works when the feature is not enabled' do
     subject
 
-    expect(response).to be_success
+    expect(response).to be_successful
   end
 
   it 'renders a 404 with a message when the feature is enabled' do