diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..682f991
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,61 @@
+name: PHP test
+
+on: [ push, pull_request ]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        unifi-version: [ stable-5, stable-6, v7.0, v7.1, v7.2, v7.3, v7.4, v7.5, v8.0 ]
+        php-version: [ 7.4, "8.0", 8.1, 8.2, 8.3 ]
+        mongo-version: [ 3.6 ]
+        os: [ ubuntu-latest ]
+
+    services:
+      mongo:
+        image: mongo:${{ matrix.mongo-version }}
+        ports:
+          - "27017:27017/tcp"
+      unifi:
+        image: jacobalberty/unifi:${{ matrix.unifi-version }}
+        env:
+          DB_URI: mongodb://mongo/unifi
+          STATDB_URI: mongodb://mongo/unifi_stat
+          DB_NAME: unifi
+        ports:
+          - "8443:8443/tcp"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          extensions: curl, json
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-version }}-
+
+      - name: Install dependencies
+        run: |
+          composer install --prefer-dist
+
+      - name: Unit tests
+        run: |
+          composer run-script test
+
+      - name: Integration tests
+        run: |
+          composer run-script integration-test   
diff --git a/.gitignore b/.gitignore
index 33306ea..acecdef 100755
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,8 @@
 *.xml
 
 # ignore PHPStorm files
-.idea/*
\ No newline at end of file
+.idea/*
+
+# PHPUnit
+/phpunit.xml
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index 4043a24..a0ff5a1 100755
--- a/composer.json
+++ b/composer.json
@@ -28,5 +28,16 @@
         "psr-4": {
             "UniFi_API\\": "src/"
         }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.5"
+    },
+    "scripts": {
+        "test" : [
+            "vendor/bin/phpunit --testdox --testsuite \"Unit tests\""
+        ],
+        "integration-test" : [
+            "vendor/bin/phpunit --testdox --testsuite \"Integration tests\""
+        ]
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..e5eeffb
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
+         colors="true">
+    <testsuites>
+        <testsuite name="Unit tests">
+            <directory>tests/Unit</directory>
+        </testsuite>
+        <testsuite name="Integration tests">
+            <directory>tests/Integration</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/src/Client.php b/src/Client.php
index 277a9ac..4fd33ad 100755
--- a/src/Client.php
+++ b/src/Client.php
@@ -1835,6 +1835,22 @@ public function set_site_connectivity(string $connectivity_id, $payload): bool
             $payload);
     }
 
+    /**
+     * Creates default admin account for controller in setup mode
+     *
+     * @return bool true on success
+     */
+    public function add_default_admin()
+    {
+        $payload = [
+            'cmd'        => 'add-default-admin',
+            'name'       => $this->user,
+            'x_password' => $this->password,
+        ];
+
+        return $this->fetch_results_boolean('/api/cmd/sitemgr', $payload, false);
+    }
+
     /**
      * Fetch admins
      *
diff --git a/tests/Integration/ClientTest.php b/tests/Integration/ClientTest.php
new file mode 100644
index 0000000..c4ee3f7
--- /dev/null
+++ b/tests/Integration/ClientTest.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace UniFi_API\Tests\Integration;
+
+use UniFi_API\Client;
+use PHPUnit\Framework\TestCase;
+
+class ClientTest extends TestCase
+{
+    protected static $client;
+
+    public static function setUpBeforeClass(): void
+    {
+        self::$client = new Client('unifi', 'unifi');
+        self::$client->add_default_admin();
+    }
+
+    public function testLogin()
+    {
+        $this->assertTrue(self::$client->login());
+    }
+
+    public function testStatSysinfo()
+    {
+        $stat_sysinfo = self::$client->stat_sysinfo();
+        $this->assertCount(1, $stat_sysinfo);
+        $this->assertObjectHasAttribute('timezone', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('autobackup', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('build', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('version', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_days', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_time_in_hours_for_5minutes_scale', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_time_in_hours_for_hourly_scale', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_time_in_hours_for_daily_scale', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_time_in_hours_for_monthly_scale', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('data_retention_time_in_hours_for_others', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('update_available', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('update_downloaded', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('live_chat', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('store_enabled', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('hostname', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('name', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('ip_addrs', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('inform_port', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('https_port', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('override_inform_host', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('image_maps_use_google_engine', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('radius_disconnect_running', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('facebook_wifi_registered', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('sso_app_id', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('sso_app_sec', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('unsupported_device_count', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('unsupported_device_list', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('unifi_go_enabled', $stat_sysinfo[0]);
+        $this->assertObjectHasAttribute('default_site_device_auth_password_alert', $stat_sysinfo[0]);
+
+        if (\version_compare($stat_sysinfo[0]->version, '6') >= 0) {
+            $this->assertObjectHasAttribute('uptime', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('anonymous_controller_id', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('has_webrtc_support', $stat_sysinfo[0]);
+        }
+
+        if (\version_compare($stat_sysinfo[0]->version, '7') >= 0) {
+            $this->assertObjectHasAttribute('debug_setting_preference', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('debug_mgmt', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('debug_system', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('debug_device', $stat_sysinfo[0]);
+            $this->assertObjectHasAttribute('debug_sdn', $stat_sysinfo[0]);
+        }
+    }
+
+    public function testListCountryCodes()
+    {
+        $country_codes = self::$client->list_country_codes();
+        $this->assertGreaterThanOrEqual(168, $country_codes);
+
+        foreach ($country_codes as $country_code) {
+            $this->assertObjectHasAttribute('code', $country_code);
+            $this->assertObjectHasAttribute('name', $country_code);
+            $this->assertObjectHasAttribute('key', $country_code);
+        }
+    }
+}
diff --git a/tests/Unit/ClientTest.php b/tests/Unit/ClientTest.php
new file mode 100644
index 0000000..3ba4040
--- /dev/null
+++ b/tests/Unit/ClientTest.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace UniFi_API\Tests;
+
+use UniFi_API\Client;
+use PHPUnit\Framework\TestCase;
+
+class ClientTest extends TestCase
+{
+    private $client;
+
+    protected function setUp(): void
+    {
+        $this->client = new Client('unifi', 'unifi');
+    }
+
+    public function testSetSite()
+    {
+        // default
+        $this->assertEquals('default', $this->client->get_site());
+
+        // custom
+        $this->client->set_site('foobar');
+        $this->assertEquals('foobar', $this->client->get_site());
+
+        // whitespace
+        $this->client->set_site('   foobar ');
+        $this->assertEquals('foobar', $this->client->get_site());
+
+        // whitespace (debug mode)
+        $this->client->set_debug(true);
+        $this->expectNotice();
+        $this->expectNoticeMessage('The provided (short) site name may not contain any spaces');
+        $this->client->set_site('   foobar ');
+    }
+}