diff --git a/src/test/c/test_Mathe.c b/src/test/c/test_Mathe.c
index b7f5554..ebddf8d 100644
--- a/src/test/c/test_Mathe.c
+++ b/src/test/c/test_Mathe.c
@@ -111,6 +111,19 @@ int a=addiere(10, 5);
 
 
 
+void test_minus()
+{
+
+int a=subtrahiere(10, 5);
+    /* assert */
+        TEST_ASSERT_EQUAL_INT(a,5);
+
+
+
+
+}
+
+