Fix #15: Faulty presence filter initialization (#16)

Fixes the NestingTrait to use the class PresenceFilter in the filterPresence() method. The use of FlatFilter results in an error as the class is not designed to handle presence filters.

Commits:
* Fix presence filter in nesting trait
* Add test

src/Query/Filter/NestingTrait.php

@@ -14,9 +14,9 @@ trait NestingTrait
      *
      * @return FlatFilter The filter to configure
      */
-    public function filterPresence(): FlatFilter
+    public function filterPresence(): PresenceFilter
     {
-        return new FlatFilter($this, FilterInterface::PRESENCE);
+        return new PresenceFilter($this, FilterInterface::PRESENCE);
     }
 
     /**

tests/IntegrationTests/Query/BuilderTest.php

@@ -22,4 +22,19 @@ public function testAddObjectClasses()
 
         $this->assertSame('(&(objectClass=inetOrgPerson)(objectClass=person)(objectClass=top)(uid=FMüller))', $query->getFilter());
     }
+
+    public function testPresenceFilter()
+    {
+        self::bootKernel();
+
+        $manager = static::$container->get('kagonlineteam_ldap.manager');
+
+        $query = (new Builder('ou=users,dc=example,dc=com', $manager->getMetadata(DummyUser::class)))
+            ->filterPresence()
+                ->on('username')
+            ->end()
+            ->make();
+
+        $this->assertSame('(&(objectClass=inetOrgPerson)(objectClass=person)(objectClass=top)(uid=*))', $query->getFilter());
+    }
 }