diff --git a/test/test_calculateFactorial .c b/test/test_calculateFactorial .c
new file mode 100644
index 0000000..fa7a51b
--- /dev/null
+++ b/test/test_calculateFactorial .c	
@@ -0,0 +1,17 @@
+#include "../src/calculateFactorial.h"
+#include "unity.h"
+#include "limits.h"
+
+void setUp(void) {
+    // set stuff up here
+}
+
+void tearDown(void) {
+    // clean stuff up here
+}
+void test_calculateFactorial_calculateFactorialofanumber(void) {
+    int expectedResult = 120;
+    int result;
+    result = calculateFactorial_integer(5);
+    TEST_ASSERT_EQUAL_INT(expectedResult, result);
+}
diff --git a/test/test_convert_CM_in_M.c b/test/test_convert_CM_in_M.c
new file mode 100644
index 0000000..83ee807
--- /dev/null
+++ b/test/test_convert_CM_in_M.c
@@ -0,0 +1,32 @@
+#include "../src/convert_CM_in_M.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_cm_to_meter(void) {
+    // Testfall 1: 100 cm sollten 1 Meter sein
+    float value_1 = 100.0;
+    float expectedResult_1 = 1.0;
+    float result_1 = cm_to_meter(value_1);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_1, result_1);
+}
+void test_cm_to_meter2(void) {
+    // Testfall 2: 50 cm sollten 0.5 Meter sein
+    float value_2 = 50.0;
+    float expectedResult_2 = 0.5;
+    float result_2 = cm_to_meter(value_2);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_2, result_2);
+}
+void test_cm_to_meter3(void) {
+    // Testfall 3: 200 cm sollten 2 Meter sein
+    float value_3 = 200.0;
+    float expectedResult_3 = 2.0;
+    float result_3 = cm_to_meter(value_3);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_3, result_3);
+}
\ No newline at end of file
diff --git a/test/test_convert_cm_in_dm.c b/test/test_convert_cm_in_dm.c
new file mode 100644
index 0000000..112ee0d
--- /dev/null
+++ b/test/test_convert_cm_in_dm.c
@@ -0,0 +1,32 @@
+#include "../src/convert_cm_in_dm.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_cm_to_dm(void) {
+    // Testfall 1: 100 cm sollten 10 Dezimeter sein
+    double value_1 = 100.0;
+    double expectedResult_1 = 10.0;
+    double result_1 = cm_to_dm(value_1);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_1, result_1);
+}
+void test_cm_to_dm2(void) {
+    // Testfall 2: 50 cm sollten 5 Dezimeter sein
+    double value_2 = 50.0;
+    double expectedResult_2 = 5.0;
+    double result_2 = cm_to_dm(value_2);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_2, result_2);
+}
+void test_cm_to_dm3(void) {
+    // Testfall 3: 200 cm sollten 20 Dezimeter sein
+    double value_3 = 200.0;
+    double expectedResult_3 = 20.0;
+    double result_3 = cm_to_dm(value_3);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult_3, result_3);
+}
\ No newline at end of file