diff --git a/composer.json b/composer.json
index 0360c70..ad0d2c8 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,8 @@
     "php": ">=8.0"
   },
   "require-dev": {
+    "brain/monkey": "^2.6",
+    "mockery/mockery": "^1.6",
     "phpunit/phpunit": "^9.6"
   },
   "autoload-dev": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..68a5fff
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         cacheResultFile=".phpunit.result.cache">
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests</directory>
+            <exclude>tests/bootstrap.php</exclude>
+            <exclude>tests/TestCase.php</exclude>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 0000000..1b9e9e0
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,24 @@
+<?php
+declare(strict_types=1);
+
+namespace WPMultiCity\Tests;
+
+use Brain\Monkey;
+use Mockery;
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        Monkey\setUp();
+    }
+
+    protected function tearDown(): void
+    {
+        Monkey\tearDown();
+        Mockery::close();
+        parent::tearDown();
+    }
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..60b78dc
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+if (!defined('ABSPATH')) {
+    define('ABSPATH', __DIR__ . '/');
+}
+
+require_once __DIR__ . '/../includes/class-plugin.php';
+\WPMultiCity\Plugin::register_autoloader();