diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 5cfa9b4..04aa2a7 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -216,4 +216,10 @@ void test_sineDegrees(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
+void test_cosineDegrees(void) {
+    float result = cosineDegrees(60.0);
+    TEST_ASSERT_FLOAT_WITHIN(0.000001, 0.5, result);
+    // Add more test cases for different inputs and expected outputs
+}
+
 #endif
\ No newline at end of file