editpdf unit test failure under windows

$ vendor/bin/phpunit  assignfeedback_editpdf_testcase mod/assign/feedback/editpdf/tests/editpdf_test.php

Moodle 2.9beta+ (Build: 20150424), mysqli, d5d23acdf546ab33a052ad06869d8d65f038b666

PHPUnit 3.7.38 by Sebastian Bergmann.

Configuration read from C:\Users\stronk7\git_moodle\integration\phpunit.xml

..EE

Warning: unlink(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/combined/2043f056dba6b8e2203ef672a9f7064efc800410/combined.pdf): Permission denied in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8782

Warning: rmdir(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/combined/2043f056dba6b8e2203ef672a9f7064efc800410): Directory not empty in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8791

Warning: rmdir(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/combined): Directory not empty in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8791

Warning: unlink(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/src-4e88c5e76e1e511bc9bacebdad5b1c0a0270b20a.pdf): Permission denied in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8782

Warning: unlink(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/src-9866f219a397fa8ffef8e9a6413fa89b25cc17b1.pdf): Permission denied in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8782

Warning: rmdir(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf): Directory not empty in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8791

Warning: rmdir(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp): Directory not empty in C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php on line 8791

Time: 32.38 seconds, Memory: 65.25Mb

There were 2 errors:

1) assignfeedback_editpdf_testcase::test_document_services

unlink(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/combined/2043f056dba6b8e2203ef672a9f7064efc800410/combined.pdf): Permission denied

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8782

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\testing\classes\util.php:728

C:\Users\stronk7\git_moodle\integration\lib\phpunit\classes\util.php:243

C:\Users\stronk7\git_moodle\integration\lib\phpunit\classes\advanced_testcase.php:107

To re-run:

 c:/Users/stronk7/git_moodle/integration/vendor/phpunit/phpunit/composer/bin/phpunit assignfeedback_editpdf_testcase mod\assign\feedback\editpdf\tests\editpdf_test.php

2) assignfeedback_editpdf_testcase::test_create_instance

unlink(C:\Users\stronk7\moodledata\integration\master\mysql_phpunit/temp/assignfeedback_editpdf/combined/2043f056dba6b8e2203ef672a9f7064efc800410/combined.pdf): Permission denied

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8782

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\moodlelib.php:8780

C:\Users\stronk7\git_moodle\integration\lib\testing\classes\util.php:728

C:\Users\stronk7\git_moodle\integration\lib\phpunit\classes\util.php:243

C:\Users\stronk7\git_moodle\integration\lib\phpunit\classes\advanced_testcase.php:107

To re-run:

 c:/Users/stronk7/git_moodle/integration/vendor/phpunit/phpunit/composer/bin/phpunit assignfeedback_editpdf_testcase mod\assign\feedback\editpdf\tests\editpdf_test.php

FAILURES!

Tests: 4, Assertions: 22, Errors: 2.