refactoring: degreesToRadians function test, rename

src/test/test_funktionen.c

@@ -173,7 +173,7 @@ void test_arcTangent_for_1_0(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
-void test_degreesToRadians(void) {
+void test_degreesToRadians_for_90_0(void) {
     float result = degreesToRadians(90.0);
     TEST_ASSERT_EQUAL_FLOAT(1.570796, result);
     // Add more test cases for different inputs and expected outputs