diff --git a/test/php/library/Director/Objects/IcingaHostTest.php b/test/php/library/Director/Objects/IcingaHostTest.php
new file mode 100644
index 00000000..80072c39
--- /dev/null
+++ b/test/php/library/Director/Objects/IcingaHostTest.php
@@ -0,0 +1,117 @@
+<?php
+
+namespace Tests\Icinga\Modules\Director\Objects;
+
+use Icinga\Module\Director\Objects\IcingaHost;
+use Icinga\Module\Director\Test\BaseTestCase;
+
+class IcingaHostTest extends BaseTestCase
+{
+    protected $testHostName = '___TEST___host';
+
+    public function testWhetherHostPropertiesCanBeSet()
+    {
+        $host = $this->host();
+        $host->display_name = 'Something else';
+        $this->assertEquals(
+            $host->display_name,
+            'Something else'
+        );
+    }
+
+    public function testWhetherHostsCanBeReplaced()
+    {
+        $host = $this->host();
+        $newHost = IcingaHost::create(
+            array('display_name' => 'Replaced display')
+        );
+
+        $this->assertEquals(
+            count($host->vars()),
+            3
+        );
+        $this->assertEquals(
+            $host->address,
+            '127.0.0.127'
+        );
+
+        $host->replaceWith($newHost);
+        $this->assertEquals(
+            $host->display_name,
+            'Replaced display'
+        );
+        $this->assertEquals(
+            $host->address,
+            null
+        );
+
+        $this->assertEquals(
+            count($host->vars()),
+            0
+        );
+    }
+
+    public function testWhetherHostsCanBeMerged()
+    {
+        $host = $this->host();
+        $newHost = IcingaHost::create(
+            array('display_name' => 'Replaced display')
+        );
+
+        $this->assertEquals(
+            count($host->vars()),
+            3
+        );
+        $this->assertEquals(
+            $host->address,
+            '127.0.0.127'
+        );
+
+        $host->merge($newHost);
+        $this->assertEquals(
+            $host->display_name,
+            'Replaced display'
+        );
+        $this->assertEquals(
+            $host->address,
+            '127.0.0.127'
+        );
+        $this->assertEquals(
+            count($host->vars()),
+            3
+        );
+    }
+
+    public function testWhetherDistinctCustomVarsCanBeSetWithoutSideEffects()
+    {
+        $host = $this->host();
+        $host->set('vars.test2', 18);
+        $this->assertEquals(
+            $host->vars()->test1->getValue(),
+            'string'
+        );
+        $this->assertEquals(
+            $host->vars()->test2->getValue(),
+            18
+        );
+        $this->assertEquals(
+            $host->vars()->test3->getValue(),
+            false
+        );
+    }
+
+    protected function host()
+    {
+        return IcingaHost::create(array(
+            'object_name'  => $this->testHostName,
+            'object_type'  => 'object',
+            'address'      => '127.0.0.127',
+            'display_name' => 'Whatever',
+            'vars'         => array(
+                'test1' => 'string',
+                'test2' => 17,
+                'test3' => false,
+            )
+        ));
+    }
+}