I tried to get this to work with PHPUnit 6.4 (since 6.5 is having issues) and kept getting these errors:

There were 2 errors:

1. foo\BuiltinTest::testTime
   TypeError: Argument 1 passed to PHPUnit\Framework\MockObject\InvocationMocker::addMatcher() must implement interface PHPUnit\Framework\MockObject\Matcher\Invocation, instance of phpmock\phpunit\DefaultArgumentRemover given, called in /data/wordpress/wp-content/plugins/zip-recipes/vendor/php-mock/php-mock-phpunit/classes/PHPMock.php on line 79

/data/wordpress/wp-content/plugins/zip-recipes/vendor/php-mock/php-mock-phpunit/classes/PHPMock.php:79
/data/wordpress/wp-content/plugins/zip-recipes/plugins/RecipeIndex/tests/SampleTest.php:15