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<?php class A {} class B extends A {} class Test { public function run(A $object){ return true; } } $test = new Test; $b = new B; var_dump($test->run($b)); // My in my spec Test is a dependency // $test->run($b)->shouldBeCalled(); // Error I get is "Argument 1 passed to run() should be instance of A, instance of B given" (paraphrased)

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