6 files declare their use of Uuid in Drupal 9
- ConfigEntityTest.php in core/
modules/ config/ tests/ src/ Functional/ ConfigEntityTest.php - ConfigInstallProfileOverrideTest.php in core/
modules/ config/ tests/ src/ Functional/ ConfigInstallProfileOverrideTest.php - EntityFieldDefaultValueTest.php in core/
tests/ Drupal/ KernelTests/ Core/ Entity/ EntityFieldDefaultValueTest.php - JsonApiDocumentTopLevelNormalizer.php in core/
modules/ jsonapi/ src/ Normalizer/ JsonApiDocumentTopLevelNormalizer.php - UuidItemTest.php in core/
modules/ field/ tests/ src/ Kernel/ String/ UuidItemTest.php - UuidTest.php in core/
tests/ Drupal/ Tests/ Component/ Uuid/ UuidTest.php