diff --git a/src/test/c/test_Mathe.c b/src/test/c/test_Mathe.c
index 3fce345..ee30654 100644
--- a/src/test/c/test_Mathe.c
+++ b/src/test/c/test_Mathe.c
@@ -17,4 +17,18 @@ void test_Mathe_plus(void)
 	TEST_ASSERT_EQUAL_INT(a,3);
 }
 
+
+void test_Mathe_minus(void)
+{
+   
+  int a=berechneErgebnis(1,2,'-');
+    /* assert */
+	TEST_ASSERT_EQUAL_INT(a,-1);
+}
+
+
+
+
+
+
 #endif