diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index beeee75..4cef254 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -155,5 +155,10 @@ void test_tangent(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
+void test_arcSine(void) {
+    float result = arcSine(0.5);
+    TEST_ASSERT_EQUAL_FLOAT(0.523599, result);
+    // Add more test cases for different inputs and expected outputs
+}
 
 #endif
\ No newline at end of file