diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 09bed6c..4d17942 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -190,4 +190,11 @@ void test_logarithmPlusOne(void) {
     TEST_ASSERT_EQUAL_FLOAT(2.0, result);
     // Add more test cases for different inputs and expected outputs
 }
+
+void test_naturalLogarithmPlusOne(void) {
+    float result = naturalLogarithmPlusOne(10.0);
+    TEST_ASSERT_EQUAL_FLOAT(3.302585, result);
+// Add more test cases for different inputs and expected outputs
+
+}
 #endif
\ No newline at end of file