Add test for issue weight crud operations

qa/qa/specs/features/ee/browser_ui/2_plan/issues_weight/issue_weight_crud_spec.rb

+# frozen_string_literal: true
+
+module QA
+  context 'Plan' do
+    describe 'Issues weight CRUD operations' do
+      let(:issue) do
+        Resource::Issue.fabricate_via_api! do |issue|
+          issue.title = 'issue-to-test-weight-crud-operations'
+        end
+      end
+
+      before do
+        Runtime::Browser.visit(:gitlab, Page::Main::Login)
+        Page::Main::Login.perform(&:sign_in_using_credentials)
+      end
+
+      it 'adds, edits, and removes issue\'s weight' do
+        issue.visit!
+
+        weight_of_one = 1
+        weight_of_two = 2
+
+        Page::Project::Issue::Show.perform do |show|
+          show.set_weight(weight_of_one)
+
+          expect(show.weight_label_value).to have_content(weight_of_one)
+
+          show.set_weight(weight_of_two)
+
+          expect(show.weight_label_value).to have_content(weight_of_two)
+
+          show.click_remove_weight_link
+
+          expect(show.weight_no_value_content).to be_visible
+          expect(show.weight_no_value_content).to have_content('None')
+        end
+      end
+    end
+  end
+end