Update setup

Provide missing example file for copying.
Fix .gitignore to only ignore copied file, not source.
Update composer.json to run through, allowing the plugins.
Remove not provided infection example.

.gitignore

@@ -5,7 +5,7 @@ typo3
 /Tests
 /Results
 infection*
-phpunit.xml.dist
+/phpunit.xml.dist
 debug-log.txt
 per-mutator.md
 summary-log.txt

Resources/Private/Configs/phpunit.xml.dist

@@ -0,0 +1,30 @@
+<?xml version="1.0"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+    backupGlobals="false"
+    backupStaticAttributes="false"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertWarningsToExceptions="true"
+    forceCoversAnnotation="false"
+    processIsolation="false"
+    stopOnError="false"
+    stopOnFailure="false"
+    stopOnIncomplete="false"
+    stopOnSkipped="false"
+    verbose="false"
+    >
+
+    <testsuites>
+        <testsuite name="unit">
+            <directory>Tests/Unit/</directory>
+        </testsuite>
+    </testsuites>
+
+    <coverage>
+        <include>
+            <directory suffix=".php">Classes</directory>
+        </include>
+    </coverage>
+</phpunit>

composer.json

@@ -26,5 +26,11 @@
     "require-dev": {
         "phpunit/phpunit": "^9.3",
         "phpspec/prophecy-phpunit": "^2.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "typo3/class-alias-loader": true,
+            "typo3/cms-composer-installers": true
+        }
     }
 }

readme.rst

@@ -287,11 +287,7 @@ Tests from user view, e.g. via browser.
 Mutation testing
 ^^^^^^^^^^^^^^^^
 
-Tests how easy it is to break test::
-
-   cp Resources/Private/Configs/infection.json.dist infection.json.dist
-
-   ./vendor/bin/infection
+Tests how easy it is to break test.
 
 * https://infection.github.io/