Fix error location

[cedric-anne]

In our test suite, we have a test class that extends an abstract test class, where are located test methods. When an assertion fails in this parent class, test result are mentionning an invalid location.

=> tests\units\MyClass::testMethod():
In file /path/to/tests/MyClass.php on line 0, integer() failed: integer(1) is not greater than integer(10)

This is due to backtrace filtering, that is searching for an error on the tested class file.

[cedric-anne]

I noticed that this cannot work. Indeed debug_backtrace(false) will not provide object (I did not changed that).
If I change the call to debug_backtrace(), messages are changed to:

 > There are 2 failures:
=> tests\units\MyClass::testMethod1():
- In file /path/to/tests/MyClass.php on line 106, boolean() failed: boolean(false) is not true
+ In file /path/to/tests/MyClass.php on line 106, boolean::isTrue() failed: boolean(false) is not true
 -Expected
 +Actual
 @@ -1 +1 @@
 -bool(true)
 +bool(false)
=> tests\units\MyClass::testMethod2():
- In file /path/to/tests/MyClass.php on line 55, array() failed: array(3) has size 3, expected size 12
+ In file /path/to/tests/MyClass.php on line 55, array::hasSize() failed: array(3) has size 3, expected size 12

Should I fix this too ?