tests for cache taking multiple input files

TestAssets/TestProjects/MultiDependentProject/Program.cs

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+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections;
+using Newtonsoft.Json.Linq;
+using FluentAssertions;
+
+class Program
+{
+    public static void Main(string[] args)
+    {
+        ArrayList argList = new ArrayList(args);
+        JObject jObject = new JObject();
+
+        foreach (string arg in argList)
+        {
+            jObject[arg] = arg;
+        }
+
+        jObject.Count.Should().Be(0);
+        Console.WriteLine(jObject.ToString());
+    }
+}