Fixed test failure (ref sebastianbergmann#2591)

Author: mbeccati

tests/Regression/GitHub/2591-separate-function-no-preserve-no-bootstrap.phpt

@@ -26,12 +26,10 @@ Time: %s, Memory: %s
 There were 2 errors:
 
 1) Issue2591_SeparateFunctionNoPreserveTest::testChangedGlobalString
-PHPUnit\Framework\Exception: PHP Fatal error:  Class 'PHPUnit\Framework\TestCase' not found %s
-Fatal error: Class 'PHPUnit\Framework\TestCase' not found %s
+PHPUnit\Framework\Exception: Fatal error: Class 'PHPUnit\Framework\TestCase' not found %s
 
 2) Issue2591_SeparateFunctionNoPreserveTest::testGlobalString
-PHPUnit\Framework\Exception: PHP Fatal error:  Class 'PHPUnit\Framework\TestCase' not found %s
-Fatal error: Class 'PHPUnit\Framework\TestCase' not found %s
+PHPUnit\Framework\Exception: Fatal error: Class 'PHPUnit\Framework\TestCase' not found %s
 
 ERRORS!
 Tests: 2, Assertions: 0, Errors: 2.