diff --git a/tests/data/db_structure.xml b/tests/data/db_structure.xml
index 03d7502c44..8a80819adf 100644
--- a/tests/data/db_structure.xml
+++ b/tests/data/db_structure.xml
@@ -135,4 +135,88 @@
 
  </table>
 
+ <table>
+
+  <name>*dbprefix*vcategory</name>
+
+  <declaration>
+
+   <field>
+    <name>id</name>
+     <type>integer</type>
+     <default>0</default>
+     <notnull>true</notnull>
+     <autoincrement>1</autoincrement>
+     <unsigned>true</unsigned>
+     <length>4</length>
+   </field>
+
+   <field>
+     <name>uid</name>
+     <type>text</type>
+     <default></default>
+     <notnull>true</notnull>
+     <length>64</length>
+    </field>
+
+   <field>
+     <name>type</name>
+     <type>text</type>
+     <default></default>
+     <notnull>true</notnull>
+     <length>64</length>
+    </field>
+
+    <field>
+     <name>category</name>
+     <type>text</type>
+     <default></default>
+     <notnull>true</notnull>
+     <length>255</length>
+    </field>
+
+    <index>
+     <name>uid_index</name>
+     <field>
+      <name>uid</name>
+      <sorting>ascending</sorting>
+     </field>
+    </index>
+
+    <index>
+     <name>type_index</name>
+     <field>
+      <name>type</name>
+      <sorting>ascending</sorting>
+     </field>
+    </index>
+
+    <index>
+     <name>category_index</name>
+     <field>
+      <name>category</name>
+      <sorting>ascending</sorting>
+     </field>
+    </index>
+
+    <index>
+     <name>uid_type_category_index</name>
+     <unique>true</unique>
+     <field>
+      <name>uid</name>
+      <sorting>ascending</sorting>
+     </field>
+     <field>
+      <name>type</name>
+      <sorting>ascending</sorting>
+     </field>
+     <field>
+      <name>category</name>
+      <sorting>ascending</sorting>
+     </field>
+    </index>
+
+  </declaration>
+ </table>
+
 </database>
diff --git a/tests/lib/db.php b/tests/lib/db.php
index 2344f7d8ec..5d30f6ac46 100644
--- a/tests/lib/db.php
+++ b/tests/lib/db.php
@@ -24,6 +24,7 @@ class Test_DB extends UnitTestCase {
 		$this->test_prefix = $r;
 		$this->table1 = $this->test_prefix.'contacts_addressbooks';
 		$this->table2 = $this->test_prefix.'contacts_cards';
+		$this->table3 = $this->test_prefix.'vcategory';
 	}
 
 	public function tearDown() {
@@ -67,4 +68,29 @@ class Test_DB extends UnitTestCase {
 		$result = $query->execute(array('uri_3'));
 		$this->assertTrue($result);
 	}
+
+	public function testinsertIfNotExist() {
+		$categoryentries = array(
+				array('user' => 'test', 'type' => 'contact', 'category' => 'Family'),
+				array('user' => 'test', 'type' => 'contact', 'category' => 'Friends'),
+				array('user' => 'test', 'type' => 'contact', 'category' => 'Coworkers'),
+				array('user' => 'test', 'type' => 'contact', 'category' => 'Coworkers'),
+				array('user' => 'test', 'type' => 'contact', 'category' => 'School'),
+			);
+
+		foreach($categoryentries as $entry) {
+			$result = OC_DB::insertIfNotExist('*PREFIX*'.$this->table3,
+				array(
+					'uid' => $entry['user'],
+					'type' => $entry['type'],
+					'category' => $entry['category'],
+				));
+			$this->assertTrue($result);
+		}
+
+		$query = OC_DB::prepare('SELECT * FROM *PREFIX*'.$this->table3);
+		$result = $query->execute();
+		$this->assertTrue($result);
+		$this->assertEqual($result->numRows(), '4');
+	}
 }