diff --git a/test/test_minirechner.c b/test/test_minirechner.c
index 112e817..a182710 100644
--- a/test/test_minirechner.c
+++ b/test/test_minirechner.c
@@ -50,4 +50,10 @@ void test_minitaschenrechner_float_minus_float(void)
     TEST_ASSERT_EQUAL(1.4, result);
 }
 
+void test_minitaschenrechner_minus7_minus_minus3(void)
+{
+    float result = subtrahieren(-7, -3);
+    TEST_ASSERT_EQUAL(-4, result);
+}
+
 #endif // TEST