MAGETWO-69137: upgrading Magento2 Project PHPUnit version to latest

 - changed unit tests to support PHPUnit 6.2

Author: Robert He

.travis.yml

@@ -59,5 +59,9 @@ script:
   - test $TEST_SUITE = "functional" && TEST_FILTER='dev/tests/functional/testsuites/Magento/Mtf/TestSuite/InjectableTests.php' || true
 
   # The scripts for grunt/phpunit type tests
-  - if [ $TEST_SUITE != "js" ]; then phpunit -c dev/tests/$TEST_SUITE $TEST_FILTER; fi
-  - if [ $TEST_SUITE == "js" ]; then grunt $GRUNT_COMMAND; fi
+  - if [ $TEST_SUITE == "functional" ]; then
+        dev/tests/functional/vendor/phpunit/phpunit/phpunit --debug --verbose -c dev/tests/$TEST_SUITE $TEST_FILTER;
+  else
+    if [ $TEST_SUITE != "js" ]; then phpunit --debug --verbose -c dev/tests/$TEST_SUITE $TEST_FILTER; fi
+    if [ $TEST_SUITE == "js" ]; then grunt $GRUNT_COMMAND; fi
+  fi