diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 86c3260..1ccee94 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -68,4 +68,10 @@ void test_ceilingValue(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
+void test_absoluteDifference(void) {
+    float result = absoluteDifference(8.0, 4.5);
+    TEST_ASSERT_FLOAT_WITHIN(0.000001, 3.5, result);
+    // Add more test cases for different inputs and expected outputs
+}
+
 #endif
\ No newline at end of file