Resolve deprecation warnings in PHPUnit

Author: markwalet

phpunit.xml

@@ -1,24 +1,26 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
          backupGlobals="false"
          backupStaticAttributes="false"
          colors="true"
          verbose="true"
          processIsolation="false"
          stopOnFailure="false">
+    <coverage includeUncoveredFiles="true" processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+        <exclude>
+            <directory suffix=".php">./src/Exceptions/</directory>
+        </exclude>
+    </coverage>
     <testsuites>
         <testsuite name="Hashed Route Test Suite">
             <directory suffix="Test.php">./tests/</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist addUncoveredFilesFromWhitelist="true" processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-            <exclude>
-                <directory suffix=".php">./src/Exceptions/</directory>
-            </exclude>
-        </whitelist>
-    </filter>
     <php>
         <env name="HASHED_ROUTE_DRIVER" value="hashids"/>
         <env name="HASHIDS_SALT" value="testSalt"/>

tests/Codecs/HashidsCodecTest.php

@@ -61,7 +61,7 @@ public function it_can_configure_an_alphabet()
 
         $hash = $generator->encode(14);
 
-        $this->assertRegExp('/^[A-Z]*$/', $hash);
+        $this->assertMatchesRegularExpression('/^[A-Z]*$/', $hash);
     }
 
     /** @test */