Added phpstan files

phpstan.neon.dist

@@ -0,0 +1,10 @@
+includes:
+    - phpstan-baseline.neon
+
+parameters:
+    level: 5
+    paths:
+        - src
+    tmpDir: build/phpstan
+    checkOctaneCompatibility: true
+    checkModelProperties: true

phpunit.xml.dist

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.3/phpunit.xsd"
+        backupGlobals="false"
+        bootstrap="vendor/autoload.php"
+        colors="true"
+        processIsolation="false"
+        stopOnFailure="false"
+        executionOrder="random"
+        failOnWarning="true"
+        failOnRisky="true"
+        failOnEmptyTestSuite="true"
+        beStrictAboutOutputDuringTests="true"
+        cacheDirectory=".phpunit.cache"
+        backupStaticProperties="false"
+>
+    <testsuites>
+        <testsuite name="MattitjaAB Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+    <logging>
+        <junit outputFile="build/report.junit.xml"/>
+    </logging>
+    <source>
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+    </source>
+</phpunit>