Enhancement: Tweak phpunit configuration

Author: localheinz

phpunit.xml

@@ -2,6 +2,13 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
     bootstrap="vendor/autoload.php"
+    colors="true"
+    beStrictAboutChangesToGlobalState="true"
+    beStrictAboutOutputDuringTests="true"
+    beStrictAboutResourceUsageDuringSmallTests="true"
+    beStrictAboutTestsThatDoNotTestAnything="true"
+    beStrictAboutTodoAnnotatedTests="true"
+    verbose="true"
 >
     <testsuites>
         <testsuite name="Unit Tests">