Remove flash notice check when member leaves project by url param

doc/development/testing_guide/flaky_tests.md

@@ -106,6 +106,7 @@ reproduction.
   - [Lazy loaded images can cause Capybara to mis-click](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18713)
 - [Triggering JS events before the event handlers are set up](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18742)
 - [Wait for the image to be lazy-loaded when asserting on a Markdown image's `src` attribute](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/25408)
+- [Avoid asserting against flash notice banners](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/79432)
 
 #### Capybara viewport size related issues
 

spec/features/projects/members/member_leaves_project_spec.rb

@@ -3,6 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe 'Projects > Members > Member leaves project' do
+  include Spec::Support::Helpers::Features::MembersHelpers
+
   let(:user) { create(:user) }
   let(:project) { create(:project, :repository) }
 
@@ -25,10 +27,14 @@ RSpec.describe 'Projects > Members > Member leaves project' do
     visit project_path(project, leave: 1)
 
     page.accept_confirm
-
     wait_for_all_requests
-    expect(find('.flash-notice')).to have_content "You left the \"#{project.full_name}\" project"
+
     expect(current_path).to eq(dashboard_projects_path)
-    expect(project.users.exists?(user.id)).to be_falsey
+
+    sign_in(project.first_owner)
+
+    visit project_project_members_path(project)
+
+    expect(members_table).not_to have_content(user.name)
   end
 end