Добавьте файлы проекта.

Pfr.Services.SchedulerTests/Pfr.Services.SchedulerTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.7" />
+    <PackageReference Include="coverlet.collector" Version="3.1.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Pfr.Services.Scheduler\Pfr.Services.Scheduler.csproj" />
+  </ItemGroup>
+
+</Project>

Pfr.Services.SchedulerTests/SchedulerTests.cs

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+using Xunit;
+using Pfr.Services.Scheduler;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Threading;
+
+namespace Pfr.Services.Scheduler.Tests
+{
+    public class SchedulerTests
+    {
+        private TimeExec _te;
+        private int _CntExec = 0;
+
+        public TimeExec GetTimeExec(int pSec)
+        {
+            TimeExec _TimeExec = new TimeExec();
+            DateTime _dateTime = DateTime.Now.AddSeconds(pSec);
+            _TimeExec.Hour = _dateTime.Hour;
+            _TimeExec.Minute = _dateTime.Minute;
+            return _TimeExec;
+        }
+
+        [Fact()]
+        public void SchedulerTest()
+        {
+            _te = GetTimeExec(2);
+            Scheduler _Scheduler = new Scheduler(_te);
+            _Scheduler.OnExecute += OnExecMetod;
+            Thread.Sleep(4000);
+        }
+
+        private void OnExecMetod(DateTime pDateTimeExec)
+        {
+            Assert.Equal(pDateTimeExec.Hour, DateTime.Now.Hour);
+            Assert.Equal(pDateTimeExec.Minute, DateTime.Now.Minute);
+        }
+
+        [Fact()]
+        public void Scheduler_Empty_OnExecute_Test()
+        {
+            _te = GetTimeExec(2);
+            Scheduler _Scheduler = new Scheduler(_te);
+            Thread.Sleep(4000);
+        }
+
+        [Fact()]
+        public void Scheduler_One_Exec_Test()
+        {
+            _te = GetTimeExec(60);
+            Scheduler _Scheduler = new Scheduler(_te);
+            _Scheduler.OnExecute += OnExec;
+            Thread.Sleep(120000);
+            Assert.Equal(_CntExec, 1);
+        }
+
+        private void OnExec(DateTime pDateTimeExec)
+        {
+            _CntExec += 1;
+        }
+    }
+}