🚧 Tests for MemoryCache

tests/MemoryCache.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Cache;
+using NUnit.Framework;
+
+namespace Kruzya.TelegramBot.Core.Tests
+{
+    public class MemoryCache
+    {
+        [Test]
+        public void GetSetItem()
+        {
+            var cache = new MemoryCache<string, int>();
+
+            int id;
+            Assert.IsFalse(cache.TryGetValue("user", out id), "GetValue() returned something");
+            
+            id = 5;
+            cache.SetValue("user", id);
+
+            id = 10;
+            Assert.IsTrue(cache.TryGetValue("user", out id), "GetValue() doesn't returned any value");
+            Assert.IsTrue(id == 5, "GetValue() returned don't expected value");
+        }
+
+        [Test]
+        public void TimeToLive()
+        {
+            var cache = new MemoryCache<string, int>();
+            cache.SetValue("user", 5, 1);
+            cache.SetValue("admin", 10, 2);
+            cache.SetValue("manager", 15, Timeout.Infinite);
+
+            int id;
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            Assert.IsFalse(cache.TryGetValue("user", out id), "GetValue() returned expired entry (user).");
+            Assert.IsTrue(cache.TryGetValue("admin", out id), "GetValue() doesn't returned live entry.");
+            Assert.IsTrue(id == 10, "GetValue() returned unexpected entry.");
+            
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            Assert.IsFalse(cache.TryGetValue("admin", out id), "GetValue() returned expired entry (admin).");
+            Assert.IsTrue(cache.TryGetValue("manager", out id), "GetValue() doesn't returned live entry.");
+            Assert.IsTrue(id == 15, "GetValue() returned unexpected entry.");
+        }
+    }
+}

tests/Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+
+        <AssemblyName>TelegramBot.Test</AssemblyName>
+
+        <RootNamespace>Kruzya.TelegramBot.Core.Tests</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="nunit" Version="3.12.0" />
+        <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Core\Core.csproj" />
+    </ItemGroup>
+
+</Project>