7 files declare their use of MediaMigrationAssertionsForMediaSourceTrait in Media Migration 8

DrushWithCoreMigrationsFromMediaTest.php in tests/src/Functional/DrushWithCoreMigrationsFromMediaTest.php

DrushWithMigrateUpgradeFromMediaTest.php in tests/src/Functional/DrushWithMigrateUpgradeFromMediaTest.php

MediaMigrationFormatterWidgetTest.php in tests/src/Kernel/Migrate/MediaMigrationFormatterWidgetTest.php

MediaMigrationNoImageAltFieldTest.php in tests/src/Kernel/Migrate/MediaMigrationNoImageAltFieldTest.php

MediaMigrationTest.php in tests/src/Kernel/Migrate/MediaMigrationTest.php

MediaMigrationWithoutImageTitleTest.php in tests/src/Kernel/Migrate/MediaMigrationWithoutImageTitleTest.php

MigrateMediaTestBase.php in tests/src/Functional/MigrateMediaTestBase.php