diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 3c10c4b..a49ef97 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -21,4 +21,9 @@ void test_squareRoot(void) {
     TEST_ASSERT_EQUAL_FLOAT(3.0, result);
 }
 
+void test_cube(void) {
+    float result = cube(2.0);
+    TEST_ASSERT_EQUAL_FLOAT(8.0, result);
+}
+
 #endif
\ No newline at end of file