diff --git a/test/test_convert_M_in_KM.c b/test/test_convert_M_in_KM.c
new file mode 100644
index 0000000..bdfeea0
--- /dev/null
+++ b/test/test_convert_M_in_KM.c
@@ -0,0 +1,32 @@
+#include "../src/convert_M_in_KM.h"
+#include "unity.h"
+#include "limits.h"
+
+void setUp(void) {
+    // Set up resources here if needed
+}
+
+void tearDown(void) {
+    // Clean up resources here if needed
+}
+void test_meter_to_kilometer(void) {
+    // Testfall 1: 1000 Meter sollten 1 Kilometer sein
+    double value_1 = 1000.0;
+    double expectedResult_1 = 1.0;
+    double result_1 = meter_to_kilometer(value_1);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_1, result_1);
+}
+void test_meter_to_kilometer2(void) {
+    // Testfall 2: 500 Meter sollten 0.5 Kilometer sein
+    double value_2 = 500.0;
+    double expectedResult_2 = 0.5;
+    double result_2 = meter_to_kilometer(value_2);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_2, result_2);
+}
+void test_meter_to_kilometer3(void) {
+// Testfall 3: 1500 Meter sollten 1.5 Kilometer sein
+    double value_3 = 1500.0;
+    double expectedResult_3 = 1.5;
+    double result_3 = meter_to_kilometer(value_3);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_3, result_3);
+}
\ No newline at end of file
diff --git a/test/test_trigonometricFunctions.c b/test/test_trigonometricFunctions.c
new file mode 100644
index 0000000..f21eb02
--- /dev/null
+++ b/test/test_trigonometricFunctions.c
@@ -0,0 +1,29 @@
+#include "../src/trigonometricFunctions.h"
+#include "unity.h"
+#include "limits.h"
+
+void setUp(void) {
+    // set stuff up here
+}
+
+void tearDown(void) {
+    // clean stuff up here
+}
+void test_trigonometricFunctions_trigonometricFunctionsofsin(void) {
+    double expectedResult = 0.850903525 ;
+    double *result;
+    result = calculate_sin_double(45);
+    TEST_ASSERT_DOUBLE_WITHIN(0.1, expectedResult, *result);
+}
+void test_trigonometricFunctions_trigonometricFunctionsofcos(void) {
+    double expectedResult = 0.525321989 ;
+    double *result;
+    result = calculate_cos_double(45);
+    TEST_ASSERT_DOUBLE_WITHIN(0.1, expectedResult, *result);
+}
+void test_trigonometricFunctions_trigonometricFunctionsoftan(void) {
+    double expectedResult = 1.61977519 ;
+    double *result;
+    result = calculate_tan_double(45);
+    TEST_ASSERT_DOUBLE_WITHIN(0.1, expectedResult, *result);
+}
\ No newline at end of file