diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index d6546dc..09bed6c 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -184,4 +184,10 @@ void test_radiansToDegrees(void) {
     TEST_ASSERT_EQUAL_FLOAT(90.0, result);
     // Add more test cases for different inputs and expected outputs
 }
+
+void test_logarithmPlusOne(void) {
+    float result = logarithmPlusOne(10.0);
+    TEST_ASSERT_EQUAL_FLOAT(2.0, result);
+    // Add more test cases for different inputs and expected outputs
+}
 #endif
\ No newline at end of file