E2E: Allow to disable quarantine functionality for e2e specs

doc/development/testing_guide/end_to_end/execution_context_selection.md

@@ -120,3 +120,5 @@ Similarly to specifying that a test should only run against a specific environme
 test only when it runs against a specific environment. The syntax is exactly the same, except that the `only: { ... }`
 hash is nested in the [`quarantine: { ... }`](https://about.gitlab.com/handbook/engineering/quality/guidelines/debugging-qa-test-failures/#quarantining-tests) hash.
 For example, `quarantine: { only: { subdomain: :staging } }` only quarantines the test when run against `staging`.
+
+The quarantine feature can be explicitly disabled with the `DISABLE_QUARANTINE` environment variable. This can be useful when running tests locally.

qa/qa/runtime/env.rb

@@ -438,6 +438,10 @@ module QA
         ENV['QA_EE_ACTIVATION_CODE']
       end
 
+      def quarantine_disabled?
+        enabled?(ENV['DISABLE_QUARANTINE'], default: false)
+      end
+
       private
 
       def remote_grid_credentials

qa/qa/specs/helpers/quarantine.rb

@@ -10,8 +10,10 @@ module QA
 
         extend self
 
-        # Skip tests in quarantine unless we explicitly focus on them.
+        # Skip tests in quarantine unless we explicitly focus on them or quarantine disabled
         def skip_or_run_quarantined_tests_or_contexts(example)
+          return if Runtime::Env.quarantine_disabled?
+
           if filters.key?(:quarantine)
             included_filters = filters_other_than_quarantine
 

qa/spec/specs/helpers/quarantine_spec.rb

@@ -104,6 +104,20 @@ RSpec.describe QA::Specs::Helpers::Quarantine do
   end
 
   describe '.skip_or_run_quarantined_tests_or_contexts' do
+    context 'with explicitly disabled quarantine' do
+      before do
+        stub_env('DISABLE_QUARANTINE', 'true')
+      end
+
+      it 'runs quarantined test' do
+        group = describe_successfully do
+          it('is pending', :quarantine) {}
+        end
+
+        expect(group.examples.first.execution_result.status).to eq(:passed)
+      end
+    end
+
     context 'with no tag focused' do
       it 'skips quarantined tests' do
         group = describe_successfully do