Use own phpunit config file, no errors on deprecations

composer.json

@@ -38,7 +38,7 @@
         "php:lint": ".Build/vendor/bin/php-cs-fixer fix --diff --dry-run --config .php-cs-fixer.php",
         "php:fix": ".Build/vendor/bin/php-cs-fixer fix --diff --config .php-cs-fixer.php",
         "ts:lint": "typoscript-lint -c Configuration/TsLint.yml --ansi -n --fail-on-warnings -vvv Configuration/TypoScript/",
-        "tests:unit": ".Build/vendor/bin/phpunit -c .Build/vendor/typo3/testing-framework/Resources/Core/Build/UnitTests.xml Tests/Unit",
+        "tests:unit": ".Build/vendor/bin/phpunit -c phpunit.xml.dist Tests/Unit",
         "tests:acceptance": [
             "@link-extension",
             "bash Tests/Acceptance/_setup/setup.sh",

phpunit.xml.dist

@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.1/phpunit.xsd"
+         backupGlobals="true"
+         beStrictAboutTestsThatDoNotTestAnything="false"
+         bootstrap=".Build/vendor/typo3/testing-framework/Resources/Core/Build/UnitTestsBootstrap.php"
+         cacheDirectory=".phpunit.cache"
+         cacheResult="false"
+         colors="true"
+         displayDetailsOnTestsThatTriggerDeprecations="true"
+         displayDetailsOnTestsThatTriggerErrors="true"
+         displayDetailsOnTestsThatTriggerNotices="true"
+         displayDetailsOnTestsThatTriggerWarnings="true"
+         failOnDeprecation="false"
+         failOnNotice="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         requireCoverageMetadata="false"
+>
+    <testsuites>
+        <testsuite name="Unit tests">
+            <!--
+                This path either needs an adaption in extensions, or an extension's
+                test location path needs to be given to phpunit.
+            -->
+            <directory>./Tests/Unit/</directory>
+        </testsuite>
+    </testsuites>
+    <php>
+        <ini name="display_errors" value="1"/>
+        <env name="TYPO3_CONTEXT" value="Testing"/>
+    </php>
+</phpunit>