Add project files.

UnitTestApp1/UnitTests.cs

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+using Microsoft.UI.Xaml.Controls;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Microsoft.VisualStudio.TestTools.UnitTesting.AppContainer;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace UnitTestApp1
+{
+    [TestClass]
+    public partial class UnitTest1
+    {
+        [TestMethod]
+        public void TestMethod1()
+        {
+            Assert.AreEqual(0, 0);
+        }
+
+        // Use the UITestMethod attribute for tests that need to run on the UI thread.
+        [UITestMethod]
+        public void TestMethod2()
+        {
+            var grid = new Grid();
+            Assert.AreEqual(0, grid.MinWidth);
+        }
+    }
+}