diff --git a/test/test_minirechner.c b/test/test_minirechner.c
index a182710..b7703ee 100644
--- a/test/test_minirechner.c
+++ b/test/test_minirechner.c
@@ -56,4 +56,10 @@ void test_minitaschenrechner_minus7_minus_minus3(void)
     TEST_ASSERT_EQUAL(-4, result);
 }
 
+void test_minitaschenrechner_4_minus_0(void)
+{
+    float result = subtrahieren(4, 0);
+    TEST_ASSERT_EQUAL(4, result);
+}
+
 #endif // TEST