add phpunit config file

Author: JBlond

composer.json

@@ -50,7 +50,7 @@
         "classmap-authoritative": true
     },
     "scripts": {
-        "phpunit": "phpunit ./tests/",
+        "phpunit": "phpunit",
         "php_src": "phpcs --standard=phpcs.xml -s -p --colors ./lib/",
         "php_test": "phpcs --standard=phpcs.xml -s -p --colors ./tests/",
         "phpmd": "phpmd ./ ansi cleancode,codesize,controversial,design,naming,unusedcode --exclude vendor"

phpunit.xml

@@ -0,0 +1,7 @@
+<phpunit colors="true" bootstrap="vendor/autoload.php">
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>