Upgrade phpunit configs

phpunit.xml.dist

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/5.7/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          backupGlobals="false"
          backupStaticAttributes="false"
          beStrictAboutTestsThatDoNotTestAnything="true"
@@ -31,12 +30,12 @@
         </exclude>
     </groups>
 
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory>./src/Composer/</directory>
-            <exclude>
-                <file>./src/Composer/Autoload/ClassLoader.php</file>
-            </exclude>
-        </whitelist>
-    </filter>
+        </include>
+        <exclude>
+            <file>./src/Composer/Autoload/ClassLoader.php</file>
+        </exclude>
+    </coverage>
 </phpunit>

tests/complete.phpunit.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/5.7/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          backupGlobals="false"
          backupStaticAttributes="false"
          beStrictAboutTestsThatDoNotTestAnything="true"
@@ -12,10 +11,11 @@
          failOnRisky="true"
          processIsolation="false"
          stopOnFailure="false"
-         bootstrap="./bootstrap.php"
+         bootstrap="tests/bootstrap.php"
 >
     <php>
         <env name="SYMFONY_DEPRECATIONS_HELPER" value="weak"/>
+        <env name="COMPOSER_TEST_SUITE" value="1"/>
     </php>
     <testsuites>
         <testsuite name="Full Composer Test Suite">
@@ -29,12 +29,12 @@
         </exclude>
     </groups>
 
-    <filter>
-        <whitelist>
-            <directory>../src/Composer/</directory>
-            <exclude>
-                <file>../src/Composer/Autoload/ClassLoader.php</file>
-            </exclude>
-        </whitelist>
-    </filter>
+    <coverage>
+        <include>
+            <directory>./src/Composer/</directory>
+        </include>
+        <exclude>
+            <file>./src/Composer/Autoload/ClassLoader.php</file>
+        </exclude>
+    </coverage>
 </phpunit>