diff --git a/.snyk b/.snyk
new file mode 100644
index 0000000..d8655ed
--- /dev/null
+++ b/.snyk
@@ -0,0 +1,6 @@
+# Snyk (<https://snyk.io>) policy file
+
+---
+exclude:
+    global:
+        - html-coverage-report/**
diff --git a/algorithm-exercises-csharp-test/src/hackerrank/warmup/MiniMaxSum.Test.cs b/algorithm-exercises-csharp-test/src/hackerrank/warmup/MiniMaxSum.Test.cs
index cc23e39..16de28b 100644
--- a/algorithm-exercises-csharp-test/src/hackerrank/warmup/MiniMaxSum.Test.cs
+++ b/algorithm-exercises-csharp-test/src/hackerrank/warmup/MiniMaxSum.Test.cs
@@ -25,5 +25,11 @@ public void testMiniMaxSum()
       Assert.AreEqual(test.expected, result);
     }
   }
+
+  [TestMethod]
+  public void testMiniMaxSumEmptyInput()
+  {
+    Assert.ThrowsException<ArgumentException>(() => MiniMaxSum.miniMaxSum([]));
+  }
 }