diff --git a/test/test_minirechner.c b/test/test_minirechner.c
index b0b992b..ee6a1b2 100644
--- a/test/test_minirechner.c
+++ b/test/test_minirechner.c
@@ -69,4 +69,10 @@ void test_minitaschenrechner_8_mal_3(void)
     TEST_ASSERT_EQUAL(24, result);
 }
 
+void test_minitaschenrechner_minus3_mal_minus4(void)
+{
+    float result = multiplizieren(-3, -4);
+    TEST_ASSERT_EQUAL(12, result);
+}
+
 #endif // TEST