refactor wait_for_requests, add slow_requests block helper

spec/features/issues/filtered_search/dropdown_assignee_spec.rb

@@ -43,11 +43,11 @@ describe 'Dropdown assignee', :js do
     end
 
     it 'should show loading indicator when opened' do
-      Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+      slow_requests do
         filtered_search.set('assignee:')
 
         expect(page).to have_css('#js-dropdown-assignee .filter-dropdown-loading', visible: true)
-      Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
+      end
     end
 
     it 'should hide loading indicator when loaded' do

spec/features/issues/filtered_search/dropdown_author_spec.rb

@@ -51,11 +51,11 @@ describe 'Dropdown author', :js do
     end
 
     it 'should show loading indicator when opened' do
-      Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+      slow_requests do
         filtered_search.set('author:')
 
         expect(page).to have_css('#js-dropdown-author .filter-dropdown-loading', visible: true)
-      Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
+      end
     end
 
     it 'should hide loading indicator when loaded' do

spec/features/issues/filtered_search/dropdown_emoji_spec.rb

@@ -70,11 +70,11 @@ describe 'Dropdown emoji', :js do
       end
 
       it 'should show loading indicator when opened' do
-        Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+        slow_requests do
           filtered_search.set('my-reaction:')
 
           expect(page).to have_css('#js-dropdown-my-reaction .filter-dropdown-loading', visible: true)
-        Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
+        end
       end
 
       it 'should hide loading indicator when loaded' do

spec/features/issues/filtered_search/dropdown_label_spec.rb

@@ -66,12 +66,12 @@ describe 'Dropdown label', :js do
     end
 
     it 'shows loading indicator when opened and hides it when loaded' do
-      Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+      slow_requests do
         filtered_search.set('label:')
 
         expect(page).to have_css("#{js_dropdown_label} .filter-dropdown-loading", visible: true)
+      end
       expect(find(js_dropdown_label)).not_to have_css('.filter-dropdown-loading')
-      Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
     end
 
     it 'loads all the labels when opened' do

spec/features/issues/filtered_search/dropdown_milestone_spec.rb

@@ -50,11 +50,11 @@ describe 'Dropdown milestone', :js do
     end
 
     it 'should show loading indicator when opened' do
-      Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+      slow_requests do
         filtered_search.set('milestone:')
 
         expect(page).to have_css('#js-dropdown-milestone .filter-dropdown-loading', visible: true)
-      Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
+      end
     end
 
     it 'should hide loading indicator when loaded' do

spec/features/projects/user_browses_files_spec.rb

@@ -179,7 +179,7 @@ describe 'User browses files' do
         click_button('Upload file')
       end
 
-      block_and_wait_for_requests_complete
+      wait_for_all_requests
 
       visit(project_blob_path(project, 'new_branch_name/logo_sample.svg'))
 

spec/features/uploads/user_uploads_file_to_note_spec.rb

@@ -21,24 +21,12 @@ feature 'User uploads file to note' do
   end
 
   context 'uploading is in progress' do
-    before do
-      Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
-    end
-
-    after do
-      Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
-    end
-
-    it 'shows "Cancel" button on uploading', :js do
-      dropzone_file([Rails.root.join('spec', 'fixtures', 'dk.png')], 0, false)
-
-      expect(page).to have_button('Cancel')
-    end
-
     it 'cancels uploading on clicking to "Cancel" button', :js do
+      slow_requests do
         dropzone_file([Rails.root.join('spec', 'fixtures', 'dk.png')], 0, false)
 
         click_button 'Cancel'
+      end
 
       expect(page).to have_button('Attach a file')
       expect(page).not_to have_button('Cancel')
@@ -46,17 +34,21 @@ feature 'User uploads file to note' do
     end
 
     it 'shows "Attaching a file" message on uploading 1 file', :js do
+      slow_requests do
         dropzone_file([Rails.root.join('spec', 'fixtures', 'dk.png')], 0, false)
 
         expect(page).to have_selector('.attaching-file-message', visible: true, text: 'Attaching a file -')
       end
+    end
 
     it 'shows "Attaching 2 files" message on uploading 2 file', :js do
+      slow_requests do
         dropzone_file([Rails.root.join('spec', 'fixtures', 'video_sample.mp4'),
                        Rails.root.join('spec', 'fixtures', 'dk.png')], 0, false)
 
         expect(page).to have_selector('.attaching-file-message', visible: true, text: 'Attaching 2 files -')
       end
+    end
 
     it 'shows error message, "retry" and "attach a new file" link a if file is too big', :js do
       dropzone_file([Rails.root.join('spec', 'fixtures', 'video_sample.mp4')], 0.01)

spec/support/inspect_requests.rb

@@ -9,7 +9,7 @@ module InspectRequests
 
     yield
 
-    block_and_wait_for_requests_complete
+    wait_for_all_requests
     Gitlab::Testing::RequestInspectorMiddleware.requests
   ensure
     Gitlab::Testing::RequestInspectorMiddleware.stop_logging!

spec/support/wait_for_requests.rb

-require_relative './wait_for_requests'
-
 module WaitForRequests
   extend self
 
   # This is inspired by http://www.salsify.com/blog/engineering/tearing-capybara-ajax-tests
   def block_and_wait_for_requests_complete
+    block_requests { wait_for_all_requests }
+  end
+
+  # Block all requests inside block with 503 response
+  def block_requests
     Gitlab::Testing::RequestBlockerMiddleware.block_requests!
-    wait_for('pending requests complete') do
-      Gitlab::Testing::RequestBlockerMiddleware.num_active_requests.zero? && finished_all_requests?
+    yield
+  ensure
+    Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
   end
+
+  # Slow down requests inside block by injecting `sleep 0.2` before each response
+  def slow_requests
+    Gitlab::Testing::RequestBlockerMiddleware.slow_requests!
+    yield
   ensure
     Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
   end
 
+  # Wait for client-side AJAX requests
   def wait_for_requests
-    wait_for('JS requests') { finished_all_requests? }
+    wait_for('JS requests complete') { finished_all_js_requests? }
+  end
+
+  # Wait for active Rack requests and client-side AJAX requests
+  def wait_for_all_requests
+    wait_for('pending requests complete') do
+      finished_all_rack_reqiests? &&
+        finished_all_js_requests?
+    end
   end
 
   private
 
-  def finished_all_requests?
+  def finished_all_rack_reqiests?
+    Gitlab::Testing::RequestBlockerMiddleware.num_active_requests.zero?
+  end
+
+  def finished_all_js_requests?
     return true unless javascript_test?
 
     finished_all_ajax_requests? &&