diff --git a/test/test_convert_cm_in_dm.c b/test/test_convert_cm_in_dm.c
new file mode 100644
index 0000000..3bce101
--- /dev/null
+++ b/test/test_convert_cm_in_dm.c
@@ -0,0 +1,18 @@
+#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);
+}
\ No newline at end of file