Cakephp 3.0 unit testing error

I am trying to run some unit tests in CakePHP 3.0 but keep getting the following errors, which seem to be more Cake problems than one I constructed myself? Anyone have a similar issue?

1) App\Test\TestCase\Controller\UsersControllerTest::testIndex
Use of undefined constant TMP - assumed 'TMP'

C:\wamp\www\mysite\vendor\cakephp\cakephp\src\Network\Session.php:141
C:\wamp\www\mysite\vendor\cakephp\cakephp\src\Network\Session.php:95
C:\wamp\www\mysite\vendor\cakephp\cakephp\src\TestSuite\IntegrationTestCas
e.php:340
C:\wamp\www\mysite\vendor\cakephp\cakephp\src\TestSuite\IntegrationTestCas
e.php:267
C:\wamp\www\mysite\vendor\cakephp\cakephp\src\TestSuite\IntegrationTestCas
e.php:188