diff --git a/core/modules/migrate/tests/src/Unit/process/MigrationTest.php b/core/modules/migrate/tests/src/Unit/process/MigrationTest.php
index cade905..6783045 100644
--- a/core/modules/migrate/tests/src/Unit/process/MigrationTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/MigrationTest.php
@@ -124,6 +124,8 @@ public function testSkipOnEmpty() {
       'migration' => 'foobaz',
     ];
     $this->migration_plugin->id()->willReturn(uniqid());
+    $this->migration_plugin_manager->createInstances(['foobaz'])
+      ->willReturn(['foobaz' => $this->migration_plugin->reveal()]);
     $migration = new Migration($configuration, 'migration', [], $this->migration_plugin->reveal(), $this->migration_plugin_manager->reveal(), $this->process_plugin_manager->reveal());
     $this->setExpectedException(MigrateSkipProcessException::class);
     $migration->transform(0, $this->migrateExecutable, $this->row, 'foo');