--- /dev/null
+<?php
+
+namespace Drupal\Tests\Core\Test;
+
+use Drupal\Tests\UnitTestCase;
+use Drupal\deprecation_test\Deprecation\FixtureDeprecatedClass;
+
+/**
+ * Test how unit tests interact with deprecation errors in process isolation.
+ *
+ * @runTestsInSeparateProcesses
+ * @preserveGlobalState disabled
+ *
+ * @group Test
+ * @group legacy
+ */
+class PhpUnitBridgeIsolatedTest extends UnitTestCase {
+
+ /**
+ * @expectedDeprecation Drupal\deprecation_test\Deprecation\FixtureDeprecatedClass is deprecated.
+ */
+ public function testDeprecatedClass() {
+ $deprecated = new FixtureDeprecatedClass();
+ $this->assertEquals('test', $deprecated->testFunction());
+ }
+
+}