Update PHPUnit configuration

Author: sebastianbergmann

phpunit.xml

@@ -2,20 +2,19 @@
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          bootstrap="tests/bootstrap.php"
+         cacheDirectory=".phpunit.cache"
          executionOrder="depends,defects"
          beStrictAboutOutputDuringTests="true"
          beStrictAboutTodoAnnotatedTests="true"
          colors="true"
-         verbose="true"
-         cacheResultFile=".phpunit.cache/test-results">
+         verbose="true">
     <testsuites>
         <testsuite name="default">
-            <directory suffix="Test.php">tests/tests</directory>
+            <directory>tests/tests</directory>
         </testsuite>
     </testsuites>
 
-    <coverage cacheDirectory=".phpunit.cache/code-coverage"
-              processUncoveredFiles="true">
+    <coverage>
         <include>
             <directory suffix=".php">src</directory>
         </include>