Issue #3458922 by quietone, alexpott, longwave: Fix index test in...

    // Run updates and test them.

    $this->runUpdates();

    // Ensure the update runs successfully even if an index existed prior to

    // the update.

    $schema = \Drupal::database()->schema();

    $this->assertTrue($schema->indexExists('locales_location', 'type_name'));

    // Ensure that index specification matches our expectations.

    $introspect_index_schema = new \ReflectionMethod(get_class($schema), 'introspectIndexSchema');

    $index_schema = $introspect_index_schema->invoke($schema, 'locales_location');

    $this->assertSame(['type', 'name'], $index_schema['indexes']['type_name']);

  }

}