Mocking or create dummy of wpdb class with Prophecy in PHPUnit.

Hello, does anybody try to create dummy or mock wpdb class with Prophecy in PHPUnit?
I got my first test something like this:
$wpdb = $this->prophesize(\wpdb::class);
$this->sut = new MyClass($wpdb->reveal());
self::assertInstanceOf(MyClass::class, $this->sut);
and when running test I get: TypeError: Argument 1 passed to MyClass::__construct() must be an instance of wpdb, instance of Double\stdClass\P1 given.
Any idea? Maybe some other mock framework will be better? Does anyone have experience with that?