diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
new file mode 100644
index 0000000..02933e7
--- /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\Knowledgebase\Admin;
+
+/**
+ * @internal
+ */
+class AdminTest extends \PHPUnit\Framework\TestCase
+{
+    protected const MODULE_NAME = 'Knowledgebase';
+    protected const URI_LOAD = 'http://127.0.0.1/en/backend/wiki';
+
+    use \Modules\tests\ModuleTestTrait;
+}
diff --git a/tests/Models/WikiAppMapperTest.php b/tests/Models/WikiAppMapperTest.php
new file mode 100644
index 0000000..71f6f3a
--- /dev/null
+++ b/tests/Models/WikiAppMapperTest.php
@@ -0,0 +1,63 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\WikiApp;
+use Modules\Knowledgebase\Models\WikiAppMapper;
+use phpOMS\Utils\RnG\Text;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiAppMapperTest: Wiki application mapper
+ *
+ * @internal
+ */
+class WikiAppMapperTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @testdox The model can be created and read from the database
+     * @covers Modules\Knowledgebase\Models\WikiAppMapper
+     * @group module
+     */
+    public function testCR() : void
+    {
+        $app = new WikiApp();
+
+        $app->setName('Test Category');
+
+        $id = WikiAppMapper::create($app);
+        self::assertGreaterThan(0, $app->getId());
+        self::assertEquals($id, $app->getId());
+
+        $appR = WikiAppMapper::get($app->getId());
+        self::assertEquals($app->getName(), $appR->getName());
+    }
+
+    /**
+     * @group volume
+     * @group module
+     * @coversNothing
+     */
+    public function testVolume() : void
+    {
+        for ($i = 1; $i < 3; ++$i) {
+            $text = new Text();
+            $app  = new WikiApp();
+
+            $app->setName($text->generateText(\mt_rand(1, 3)));
+
+            $id = WikiAppMapper::create($app);
+        }
+    }
+}
diff --git a/tests/Models/WikiAppTest.php b/tests/Models/WikiAppTest.php
new file mode 100644
index 0000000..7a30c9f
--- /dev/null
+++ b/tests/Models/WikiAppTest.php
@@ -0,0 +1,54 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\WikiApp;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiAppTest: Wiki application
+ *
+ * @internal
+ */
+class WikiAppTest extends \PHPUnit\Framework\TestCase
+{
+    protected WikiApp $app;
+
+    protected function setUp() : void
+    {
+        $this->app = new WikiApp();
+    }
+
+    /**
+     * @testdox The model has the expected default values after initialization
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->app->getId());
+        self::assertEquals('', $this->app->getName());
+    }
+
+    /**
+     * @testdox The name can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testNameInputOutput() : void
+    {
+        $this->app->setName('Test name');
+        self::assertEquals('Test name', $this->app->getName());
+    }
+}
diff --git a/tests/Models/WikiCategoryMapperTest.php b/tests/Models/WikiCategoryMapperTest.php
new file mode 100644
index 0000000..a112a6e
--- /dev/null
+++ b/tests/Models/WikiCategoryMapperTest.php
@@ -0,0 +1,88 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\NullWikiCategory;
+use Modules\Knowledgebase\Models\WikiCategory;
+use Modules\Knowledgebase\Models\WikiCategoryMapper;
+use phpOMS\Utils\RnG\Text;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiCategoryMapperTest: Wiki category mapper
+ *
+ * @internal
+ */
+class WikiCategoryMapperTest extends \PHPUnit\Framework\TestCase
+{
+    protected WikiCategory $category;
+
+    protected function setUp() : void
+    {
+        $this->category = new WikiCategory();
+    }
+
+    /**
+     * @testdox The model can be created and read from the database
+     * @covers Modules\Knowledgebase\Models\WikiAppMapper
+     * @group module
+     */
+    public function testCR() : void
+    {
+        $this->category->setName('Test Category');
+
+        $id = WikiCategoryMapper::create($this->category);
+        self::assertGreaterThan(0, $this->category->getId());
+        self::assertEquals($id, $this->category->getId());
+
+        $categoryR = WikiCategoryMapper::get($this->category->getId());
+        self::assertEquals($this->category->getName(), $categoryR->getName());
+    }
+
+    /**
+     * @testdox The model can be created and read from the database with a parent category
+     * @covers Modules\Knowledgebase\Models\WikiAppMapper
+     * @group module
+     */
+    public function testChildCR() : void
+    {
+        $this->category->setName('Test Category2');
+        $this->category->setParent(new NullWikiCategory(1));
+
+        $id = WikiCategoryMapper::create($this->category);
+        self::assertGreaterThan(0, $this->category->getId());
+        self::assertEquals($id, $this->category->getId());
+
+        $categoryR = WikiCategoryMapper::get($this->category->getId());
+        self::assertEquals($this->category->getName(), $categoryR->getName());
+        self::assertEquals($this->category->getParent()->getId(), $categoryR->getParent()->getId());
+    }
+
+    /**
+     * @group volume
+     * @group module
+     * @coversNothing
+     */
+    public function testVolume() : void
+    {
+        for ($i = 1; $i < 30; ++$i) {
+            $text     = new Text();
+            $category = new WikiCategory();
+
+            $category->setName($text->generateText(\mt_rand(1, 3)));
+
+            $id = WikiCategoryMapper::create($category);
+        }
+    }
+}
diff --git a/tests/Models/WikiCategoryTest.php b/tests/Models/WikiCategoryTest.php
new file mode 100644
index 0000000..3507c97
--- /dev/null
+++ b/tests/Models/WikiCategoryTest.php
@@ -0,0 +1,93 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\NullWikiApp;
+use Modules\Knowledgebase\Models\NullWikiCategory;
+use Modules\Knowledgebase\Models\WikiCategory;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiCateboryTest: Wiki category
+ *
+ * @internal
+ */
+class WikiCategoryTest extends \PHPUnit\Framework\TestCase
+{
+    protected WikiCategory $category;
+
+    protected function setUp() : void
+    {
+        $this->category = new WikiCategory();
+    }
+
+
+    /**
+     * @testdox The model has the expected default values after initialization
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->category->getId());
+        self::assertEquals(0, $this->category->getApp()->getId());
+        self::assertEquals('', $this->category->getName());
+        self::assertEquals('/', $this->category->getPath());
+        self::assertEquals(0, $this->category->getParent()->getId());
+    }
+
+    /**
+     * @testdox The application can correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testAppInputOutput() : void
+    {
+        $this->category->setApp(new NullWikiApp(2));
+        self::assertEquals(2, $this->category->getApp()->getId());
+    }
+
+    /**
+     * @testdox The name can correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testNameInputOutput() : void
+    {
+        $this->category->setName('Category Name');
+        self::assertEquals('Category Name', $this->category->getName());
+    }
+
+    /**
+     * @testdox The path can correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testPathInputOutput() : void
+    {
+        $this->category->setPath('/test/path');
+        self::assertEquals('/test/path', $this->category->getPath());
+    }
+
+    /**
+     * @testdox The parent can correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiApp
+     * @group module
+     */
+    public function testParentInputOutput() : void
+    {
+        $this->category->setParent(new NullWikiCategory(2));
+        self::assertEquals(2, $this->category->getParent()->getId());
+    }
+}
diff --git a/tests/Models/WikiDocMapperTest.php b/tests/Models/WikiDocMapperTest.php
new file mode 100644
index 0000000..3e67694
--- /dev/null
+++ b/tests/Models/WikiDocMapperTest.php
@@ -0,0 +1,77 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\NullWikiCategory;
+use Modules\Knowledgebase\Models\WikiDoc;
+use Modules\Knowledgebase\Models\WikiDocMapper;
+use Modules\Knowledgebase\Models\WikiStatus;
+use phpOMS\Utils\RnG\Text;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiDocMapperTest: Wiki document mapper
+ *
+ * @internal
+ */
+class WikiDocMapperTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @testdox The model can be created and read from the database
+     * @covers Modules\Knowledgebase\Models\WikiDocMapper
+     * @group module
+     */
+    public function testCR() : void
+    {
+        $doc = new WikiDoc();
+
+        $doc->setName('Doc Name');
+        $doc->setDoc('Doc content');
+        $doc->setStatus(WikiStatus::DRAFT);
+        $doc->setCategory(new NullWikiCategory(1));
+        $doc->setLanguage('en');
+
+        $id = WikiDocMapper::create($doc);
+        self::assertGreaterThan(0, $doc->getId());
+        self::assertEquals($id, $doc->getId());
+
+        $docR = WikiDocMapper::get($doc->getId());
+        self::assertEquals($doc->getName(), $docR->getName());
+        self::assertEquals($doc->getDoc(), $docR->getDoc());
+        self::assertEquals($doc->getStatus(), $docR->getStatus());
+        self::assertEquals($doc->getLanguage(), $docR->getLanguage());
+        self::assertEquals($doc->getCategory()->getId(), $docR->getCategory()->getId());
+    }
+
+    /**
+     * @group volume
+     * @group module
+     * @coversNothing
+     */
+    public function testVolume() : void
+    {
+        for ($i = 1; $i < 30; ++$i) {
+            $text = new Text();
+            $doc  = new WikiDoc();
+
+            $doc->setName($text->generateText(\mt_rand(1, 3)));
+            $doc->setDoc($text->generateText(\mt_rand(100, 500)));
+            $doc->setStatus(WikiStatus::ACTIVE);
+            $doc->setCategory(new NullWikiCategory(\mt_rand(1, 9)));
+            $doc->setLanguage('en');
+
+            $id = WikiDocMapper::create($doc);
+        }
+    }
+}
diff --git a/tests/Models/WikiDocTest.php b/tests/Models/WikiDocTest.php
new file mode 100644
index 0000000..429021b
--- /dev/null
+++ b/tests/Models/WikiDocTest.php
@@ -0,0 +1,142 @@
+<?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\Knowledgebase\Models;
+
+use Modules\Knowledgebase\Models\NullWikiApp;
+use Modules\Knowledgebase\Models\NullWikiCategory;
+use Modules\Knowledgebase\Models\WikiDoc;
+use Modules\Knowledgebase\Models\WikiStatus;
+use Modules\Tag\Models\NullTag;
+
+/**
+ * @testdox Modules\tests\Knowledgebase\Models\WikiDocTest: Wiki document
+ *
+ * @internal
+ */
+class WikiDocTest extends \PHPUnit\Framework\TestCase
+{
+    protected WikiDoc $doc;
+
+    protected function setUp() : void
+    {
+        $this->doc = new WikiDoc();
+    }
+
+    /**
+     * @testdox The model has the expected default values after initialization
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->doc->getId());
+        self::assertEquals(0, $this->doc->getApp()->getId());
+        self::assertEquals('', $this->doc->getName());
+        self::assertEquals('', $this->doc->getDoc());
+        self::assertEquals('', $this->doc->getDocRaw());
+        self::assertEquals(WikiStatus::ACTIVE, $this->doc->getStatus());
+        self::assertEquals(0, $this->doc->getCategory()->getId());
+        self::assertEquals('en', $this->doc->getLanguage());
+        self::assertEquals([], $this->doc->getTags());
+    }
+
+    /**
+     * @testdox The application can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function tesAppInputOutput() : void
+    {
+        $this->doc->setApp(new NullWikiApp(2));
+        self::assertEquals(2, $this->doc->getApp()->getId());
+    }
+
+    /**
+     * @testdox The name can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testNameInputOutput() : void
+    {
+        $this->doc->setName('Test name');
+        self::assertEquals('Test name', $this->doc->getName());
+    }
+
+    /**
+     * @testdox The content can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testDocInputOutput() : void
+    {
+        $this->doc->setDoc('Test content');
+        self::assertEquals('Test content', $this->doc->getDoc());
+    }
+
+    /**
+     * @testdox The raw content can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testDocRawInputOutput() : void
+    {
+        $this->doc->setDocRaw('Test content');
+        self::assertEquals('Test content', $this->doc->getDocRaw());
+    }
+
+    /**
+     * @testdox The status can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testStatusInputOutput() : void
+    {
+        $this->doc->setStatus(WikiStatus::DRAFT);
+        self::assertEquals(WikiStatus::DRAFT, $this->doc->getStatus());
+    }
+
+    /**
+     * @testdox The category can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testCategoryInputOutput() : void
+    {
+        $this->doc->setCategory(new NullWikiCategory(3));
+        self::assertEquals(3, $this->doc->getCategory()->getId());
+    }
+
+    /**
+     * @testdox The language can be correctly set and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testLanguageInputOutput() : void
+    {
+        $this->doc->setLanguage('de');
+        self::assertEquals('de', $this->doc->getLanguage());
+    }
+
+    /**
+     * @testdox A tag can be correctly added and returned
+     * @covers Modules\Knowledgebase\Models\WikiDoc
+     * @group module
+     */
+    public function testTagInputOutput() : void
+    {
+        $this->doc->addTag(new NullTag(5));
+        self::assertEquals([new NullTag(5)], $this->doc->getTags());
+    }
+}