Issue #3522795 by alexpott, bbrala:...

Issue #3522795 by alexpott, bbrala: \Drupal\Tests\Core\DefaultContent\FinderTest::testExceptionIfNoUuid() can cause random fails

(cherry picked from commit d0d9ddba)

core/tests/Drupal/Tests/Core/DefaultContent/FinderTest.php

@@ -4,7 +4,6 @@
 
 namespace Drupal\Tests\Core\DefaultContent;
 
-use Drupal\Component\FileSystem\FileSystem;
 use Drupal\Core\DefaultContent\Finder;
 use Drupal\Core\DefaultContent\ImportException;
 use Drupal\Tests\UnitTestCase;
@@ -38,14 +37,9 @@ public function testFoundDataIsInDependencyOrder(): void {
    * Tests that files without UUIDs will raise an exception.
    */
   public function testExceptionIfNoUuid(): void {
-    $dir = FileSystem::getOsTemporaryDirectory();
-    $this->assertIsString($dir);
-    /** @var string $dir */
-    file_put_contents($dir . '/no-uuid.yml', '_meta: {}');
-
     $this->expectException(ImportException::class);
-    $this->expectExceptionMessage("$dir/no-uuid.yml does not have a UUID.");
-    new Finder($dir);
+    $this->expectExceptionMessageMatches("#/no-uuid\.yml does not have a UUID\.$#");
+    new Finder(__DIR__ . '/../../../../fixtures/default_content_broken');
   }
 
 }

core/tests/fixtures/default_content_broken/no-uuid.yml

+_meta:
+  version: '1.0'
+  entity_type: block_content
+  bundle: basic
+  default_langcode: en
+default:
+  status:
+    -
+      value: true
+  info:
+    -
+      value: 'Useful Info'
+  reusable:
+    -
+      value: true
+  revision_translation_affected:
+    -
+      value: true
+  body:
+    -
+      value: "I'd love to put some useful info here."
+      format: plain_text
+      summary: ''