test: 添加phpunit配置

phpstan.neon.dist

+parameters:
+    level: 6 #  you can currently choose from 9 levels (0 is the loosest and 8 is the strictest).
+    # Often I use the level 5 because the level 6 checks that every method returns type.
+    # As Symfony code generator commands does not fill those return types, it's quite inconvenient to set a level greater than 5.
+    # Feel free to use the one you prefer. You could even set it to 0 to start slowly
+    paths:
+        - src
+        # if you have tests and want to analyze this folder, uncomment the line below
+        - tests
+    phpVersion: 70200

phpunit.xml.dist

+<?xml version="1.0"?>
+<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"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         verbose="true">
+    <testsuites>
+        <testsuite name="unit">
+            <directory suffix="Test.php">tests/unit/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
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