diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 37852c4..28ea824 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -137,4 +137,10 @@ void test_howManyTimes_e_appearsIn_Beere(void)
     TEST_ASSERT_EQUAL_INT(expected, actual);
 }
 
+
+void test_sine(void) {
+    float result = sine(0.5);
+    TEST_ASSERT_FLOAT_WITHIN(0.000001, 0.479426, result);
+}
+
 #endif
\ No newline at end of file