Add project files.

Bankos.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32413.511
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Bankos", "Bankos\Bankos.csproj", "{3E80B462-491A-40C9-9E32-A651C92FBB6C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BankTest", "TestProject1\BankTest.csproj", "{2B3B0F41-7C5E-44A4-9DD8-8EB8341301B4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3E80B462-491A-40C9-9E32-A651C92FBB6C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3E80B462-491A-40C9-9E32-A651C92FBB6C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3E80B462-491A-40C9-9E32-A651C92FBB6C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3E80B462-491A-40C9-9E32-A651C92FBB6C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{2B3B0F41-7C5E-44A4-9DD8-8EB8341301B4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2B3B0F41-7C5E-44A4-9DD8-8EB8341301B4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2B3B0F41-7C5E-44A4-9DD8-8EB8341301B4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2B3B0F41-7C5E-44A4-9DD8-8EB8341301B4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {057D358D-F849-4AE9-813B-5101D7A80DF8}
+	EndGlobalSection
+EndGlobal

Bankos/Bankos.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Bankos/Program.cs

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+using System;
+
+namespace Bankos
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            BankAdat ba = new BankAdat("Kiss Péter", 1000);
+            Console.WriteLine(ba.getEgyenleg());
+            
+        }
+        
+    }
+
+    public class BankAdat
+    {
+        private string nev;
+        private int egyenleg;
+
+        public BankAdat (string benev, int egyen)
+        {            
+            nev = benev;
+            egyenleg = egyen;
+        }
+
+        public int getEgyenleg ()
+        {
+            return egyenleg;
+        }
+
+        public void Kivet(int osszeg)
+        {
+            if (osszeg>egyenleg)
+            {
+                throw new ArgumentOutOfRangeException("osszeg");
+            }
+            if (osszeg < 0)
+            {
+                throw new ArgumentOutOfRangeException("osszeg");
+            }
+            if (osszeg<=egyenleg && osszeg>0)
+            {
+                egyenleg -= osszeg;
+            }
+        }
+    }
+}
+

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 Péter", kezdegyenleg);
+            ba.Kivet(csokkento);
+            int eredmeny = ba.getEgyenleg();
+            Assert.AreEqual(elvart, eredmeny);
+        }
+    }
+}