PHPUnit - broken public method calls in constructor

ExceptionTestCase.php

<?php
use PHPUnit\Framework\TestCase;

class ExceptionTestCase extends TestCase
{
    public function testException()
    {
        $this->expectException(TypeError::class);
        $this->expectExceptionMessage('call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object');
        $this->getMockBuilder(Foo::class)
            ->enableProxyingToOriginalMethods()
            ->getMock();
    }
}

class Foo
{
    public function __construct()
    {
        $this->setBar();
    }

    public function setBar()
    {
    }
}