diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
new file mode 100644
index 0000000..d30a810
--- /dev/null
+++ b/tests/Admin/AdminTest.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\tests\HumanResourceTimeRecording\Admin;
+
+/**
+ * @internal
+ */
+class AdminTest extends \PHPUnit\Framework\TestCase
+{
+    protected const MODULE_NAME = 'HumanResourceTimeRecording';
+    protected const URI_LOAD = '';
+
+    use \Modules\tests\ModuleTestTrait;
+}
diff --git a/tests/Models/SessionElementMapperTest.php b/tests/Models/SessionElementMapperTest.php
new file mode 100644
index 0000000..af86c53
--- /dev/null
+++ b/tests/Models/SessionElementMapperTest.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\tests\HumanResourceTimeRecording\Models;
+
+use Modules\HumanResourceTimeRecording\Models\Session;
+use Modules\HumanResourceTimeRecording\Models\SessionElement;
+use Modules\HumanResourceTimeRecording\Models\SessionElementMapper;
+
+/**
+ * @internal
+ */
+class SessionElementMapperTest extends \PHPUnit\Framework\TestCase
+{
+    public function testCRUD() : void
+    {
+        $element = new SessionElement(new Session(1), new \DateTime('now'));
+
+        $id = SessionElementMapper::create($element);
+        self::assertGreaterThan(0, $element->getId());
+        self::assertEquals($id, $element->getId());
+
+        $elementR = SessionElementMapper::get($element->getId());
+        self::assertEquals($element->getDatetime()->format('Y-m-d'), $elementR->getDatetime()->format('Y-m-d'));
+        self::assertEquals($element->getStatus(), $elementR->getStatus());
+        self::assertEquals($element->getSession()->getEmployee(), $elementR->getSession()->getEmployee()->getId());
+    }
+}
diff --git a/tests/Models/SessionElementTest.php b/tests/Models/SessionElementTest.php
new file mode 100644
index 0000000..f4dfb97
--- /dev/null
+++ b/tests/Models/SessionElementTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\tests\HumanResourceTimeRecording\Models;
+
+use Modules\HumanResourceTimeRecording\Models\ClockingStatus;
+use Modules\HumanResourceTimeRecording\Models\SessionElement;
+
+/**
+ * @internal
+ */
+class SessionElementTest extends \PHPUnit\Framework\TestCase
+{
+    public function testDefault() : void
+    {
+        $element = new SessionElement();
+
+        self::assertEquals(0, $element->getId());
+        self::assertEquals(0, $element->getSession());
+        self::assertEquals((new \DateTime('now'))->format('Y-m-d'), $element->getDatetime()->format('Y-m-d'));
+        self::assertEquals(ClockingStatus::START, $element->getStatus());
+    }
+
+    public function testSetGet() : void
+    {
+        $element = new SessionElement();
+
+        $element->setStatus(ClockingStatus::END);
+        self::assertEquals(ClockingStatus::END, $element->getStatus());
+    }
+}
diff --git a/tests/Models/SessionMapperTest.php b/tests/Models/SessionMapperTest.php
new file mode 100644
index 0000000..ebe2ff5
--- /dev/null
+++ b/tests/Models/SessionMapperTest.php
@@ -0,0 +1,103 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\tests\HumanResourceTimeRecording\Models;
+
+use Modules\HumanResourceTimeRecording\Models\ClockingStatus;
+use Modules\HumanResourceTimeRecording\Models\Session;
+use Modules\HumanResourceTimeRecording\Models\SessionElement;
+use Modules\HumanResourceTimeRecording\Models\SessionMapper;
+
+/**
+ * @internal
+ */
+class SessionMapperTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\HumanResourceTimeRecording\Models\SessionMapper
+     * @group module
+     */
+    public function testCRUD() : void
+    {
+        $session = new Session(1);
+
+        $dt = new \DateTime(\date('Y-m-d', \strtotime('now')) . ' 7:55:34');
+        $element = new SessionElement($session, $dt);
+        $element->setStatus(ClockingStatus::START);
+        $session->addSessionElement($element);
+
+        $id = SessionMapper::create($session);
+        self::assertGreaterThan(0, $session->getId());
+        self::assertEquals($id, $session->getId());
+
+        $sessionR = SessionMapper::get($session->getId());
+        self::assertEquals($session->getType(), $sessionR->getType());
+    }
+
+    /**
+     * @group volume
+     * @group module
+     * @coversNothing
+     */
+    public function testVolume() : void
+    {
+        for ($i = 0; $i < 1000; ++$i) {
+            $day     = \date('Y-m-d', \strtotime(' -' . ($i + 1) . ' day'));
+            $weekday = \date('D', \strtotime($day));
+
+            if ($weekday === 'Sat' || $weekday === 'Sun') {
+                continue;
+            }
+
+            $session = new Session(1);
+
+            $hourStart    = \mt_rand(7, 9);
+            $minutesStart = \mt_rand(0, 59);
+
+            $hourEnd    = \mt_rand(16, 18);
+            $minutesEnd = \mt_rand(0, 59);
+
+            $hourBreakStart    = \mt_rand(11, 14);
+            $minutesBreakStart = \mt_rand(0, 59);
+
+            $breakLength = \mt_rand(5, 90);
+
+            // start
+            $dt      = new \DateTime($day . ' ' . $hourStart . ':' . $minutesStart);
+            $element = new SessionElement($session, $dt);
+            $element->setStatus(ClockingStatus::START);
+            $session->addSessionElement($element);
+
+            // break start
+            $dt      = new \DateTime($day . ' ' . $hourBreakStart . ':' . $minutesBreakStart);
+            $element = new SessionElement($session, $dt);
+            $element->setStatus(ClockingStatus::PAUSE);
+            $session->addSessionElement($element);
+
+            // work continue
+            $dt      = new \DateTime($day . ' ' . ($hourBreakStart + ((int) (($minutesBreakStart + $breakLength) / 60))) . ':' . (($minutesBreakStart + $breakLength) % 60));
+            $element = new SessionElement($session, $dt);
+            $element->setStatus(ClockingStatus::CONTINUE);
+            $session->addSessionElement($element);
+
+            // end
+            $dt      = new \DateTime($day . ' ' . $hourEnd . ':' . $minutesEnd);
+            $element = new SessionElement($session, $dt);
+            $element->setStatus(ClockingStatus::END);
+            $session->addSessionElement($element);
+
+            SessionMapper::create($session);
+        }
+    }
+}
diff --git a/tests/Models/SessionTest.php b/tests/Models/SessionTest.php
new file mode 100644
index 0000000..37cb948
--- /dev/null
+++ b/tests/Models/SessionTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\tests\HumanResourceTimeRecording\Models;
+
+use Modules\HumanResourceTimeRecording\Models\ClockingStatus;
+use Modules\HumanResourceTimeRecording\Models\ClockingType;
+use Modules\HumanResourceTimeRecording\Models\Session;
+use Modules\HumanResourceTimeRecording\Models\SessionElement;
+
+/**
+ * @internal
+ */
+class SessionTest extends \PHPUnit\Framework\TestCase
+{
+    public function testDefault() : void
+    {
+        $session = new Session();
+
+        self::assertEquals(0, $session->getId());
+        self::assertEquals(0, $session->getBusy());
+        self::assertEquals(ClockingType::OFFICE, $session->getType());
+        self::assertEquals(ClockingStatus::START, $session->getStatus());
+        self::assertEquals((new \DateTime('now'))->format('Y-m-d'), $session->getStart()->format('Y-m-d'));
+        self::assertNull($session->getEnd());
+    }
+
+    public function testSetGet() : void
+    {
+        $session = new Session();
+
+        $session->setType(ClockingType::VACATION);
+        self::assertEquals(ClockingType::VACATION, $session->getType());
+
+        $element = new SessionElement(0, new \DateTime('now'));
+        $element->setStatus(ClockingStatus::PAUSE);
+        $session->addSessionElement($element);
+
+        self::assertEquals(ClockingStatus::PAUSE, $session->getStatus());
+    }
+}