Project files and Day01.

AdventOfCode2020.Tests/AdventOfCode2020.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.1" />
+    <PackageReference Include="coverlet.collector" Version="1.3.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AdventOfCode2020\AdventOfCode2020.csproj" />
+  </ItemGroup>
+
+</Project>

AdventOfCode2020.Tests/Day01_Tests.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AdventOfCode2020.Tests
+{
+    [TestClass()]
+    public class Day01_Tests
+    {
+        #region ResolvePart1
+
+        [TestMethod()]
+        public void ResolvePart1__Example()
+        {
+            Day01 day01 = new Day01();
+
+            string result = day01.ResolvePart1(new string[] {
+                "1721",
+                "979",
+                "366",
+                "299",
+                "675",
+                "1456",
+            });
+
+            Assert.AreEqual("514579", result);
+        }
+
+        #endregion ResolvePart1
+
+        #region ResolvePart2
+
+        [TestMethod()]
+        public void ResolvePart2__Example()
+        {
+            Day01 day01 = new Day01();
+
+            string result = day01.ResolvePart2(new string[] {
+                "1721",
+                "979",
+                "366",
+                "299",
+                "675",
+                "1456",
+            });
+
+            Assert.AreEqual("241861950", result);
+        }
+
+        #endregion ResolvePart2
+    }
+}