Bring test suite configuration closer to best practice defaults

Author: sebastianbergmann

phpunit.xml

@@ -4,6 +4,8 @@
          bootstrap="tests/bootstrap.php"
          cacheDirectory=".phpunit.cache"
          beStrictAboutOutputDuringTests="true"
+         displayDetailsOnPhpunitDeprecations="true"
+         failOnPhpunitDeprecation="true"
          failOnRisky="true"
          failOnWarning="true"
          colors="true">
@@ -39,7 +41,7 @@
         </testsuite>
     </testsuites>
 
-    <source>
+    <source restrictDeprecations="true" restrictNotices="true" restrictWarnings="true">
         <include>
             <directory>src</directory>
         </include>