Add project files.

TestProject1/BankTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
+    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Bankos\Bankos.csproj" />
+  </ItemGroup>
+
+</Project>

TestProject1/UnitTest1.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Bankos;
+
+namespace BankTest
+{
+    [TestClass]
+    public class UnitTest1
+    {
+        [TestMethod]
+        public void TestMethod1()
+        {
+            int kezdegyenleg = 1000;
+            int csokkento = 300;
+            int elvart = 700;
+
+            BankAdat ba = new BankAdat("Kiss P<>ter", kezdegyenleg);
+            ba.Kivet(csokkento);
+            int eredmeny = ba.getEgyenleg();
+            Assert.AreEqual(elvart, eredmeny);
+        }
+    }
+}