Is there a way to shorten exception stacktrace when mocking objects using PHPUnit?

I have about 500 unit tests, which in total have about 2000 assertions. I also have a test for a method, where there is an exception handling, which influences the return value.

I am creating the mock in the following way:

$mockedClass = $this
    ->getMockBuilder('\My\Class\To\Mock')
    ->disableOriginalConstructor()
    ->setMethods(['ThisMethodThrows'])
    ->getMock();

$mockedClass
    ->expects($this->any())
    ->method('ThisMethodThrows')
    ->will($this->throwException(new \Exception));

And that works. I pass this $mockedClass to the object whose behaviour I am testing, and inside this method I have logging that logs which method failed and also what the parameters were (using print_r($parameter, true)).

When I run this test alone, it works, but if I run the whole bundle of (500) tests, when I get to this test, the print_r fails, because it is no longer able to print the content of the $mockedClass, because the stacktrace, for some reason, is really long, and if I print_r the mocked object into console, the list basically goes forever.

Is this a default PHPUnit behaviour? If not, is there a problem with how I defined the mock which is supposed to throw an exception? If the code for mocking the class is correct, can I somehow shorten the output when the exception is thrown?