diff --git a/tests/Customer/R/CalcTest.php b/tests/Customer/R/CalcTest.php
index 9110e8c..b8ae586 100644
--- a/tests/Customer/R/CalcTest.php
+++ b/tests/Customer/R/CalcTest.php
@@ -52,6 +52,16 @@ class CalcTest extends TestCase
     }
 
     public function testOptionCheckbox(): void
+    {
+        self::assertTrue($this->engine->getArticle()->getOptionById('checkboxen2')->getOptions()[0]->isSelected());
+        self::assertTrue($this->engine->getArticle()->getOptionById('checkboxen2')->getOptions()[1]->isSelected());
+
+        self::assertFalse($this->engine->getArticle()->getOptionById('checkboxen3')->getOptions()[0]->isSelected());
+        self::assertTrue($this->engine->getArticle()->getOptionById('checkboxen3')->getOptions()[1]->isSelected());
+
+    }
+
+    public function testOptionDefaultCheckbox(): void
     {
         $this->engine->setVariable('checkboxen1', [1,2]);
         $this->engine->calc();
diff --git a/tests/Customer/R/calc.xml b/tests/Customer/R/calc.xml
index bc0d505..103fe7c 100644
--- a/tests/Customer/R/calc.xml
+++ b/tests/Customer/R/calc.xml
@@ -140,11 +140,13 @@
             <opt id="1" name="Auswahl 1-1"></opt>
             <opt id="2" name="Auswahl 1-2"></opt>
         </option>
-        <option id="checkboxen2" name="Checkboxen 2" type="Checkbox">
+        <option id="checkboxen2" name="Checkboxen 2" type="Checkbox" default="1,2">
             <opt id="1" name="Auswahl 2-1"></opt>
+            <opt id="2" name="Auswahl 2-2"></opt>
         </option>
-        <option id="checkboxen3" name="Checkboxen 3" type="Checkbox">
+        <option id="checkboxen3" name="Checkboxen 3" type="Checkbox" default="2">
             <opt id="1" name="Auswahl 3-1"></opt>
+            <opt id="2" name="Auswahl 3-2"></opt>
         </option>
         <!-- ### Eingabebox einzeilig 1 ### -->
         <option id="input1" name="Eingabe" type="Input" />