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RobThreeRobThree
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‎IClock.Tests/CustomClockTests.cs‎

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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System;
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namespace IClock.Tests
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{
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[TestClass]
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public class CustomClockTests
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{
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[TestMethod]
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[ExpectedException(typeof(ArgumentNullException))]
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public void CustomClock_Throws_OnNullArgument() => new CustomClock(null);
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[TestMethod]
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public void CustomClock_GetTime_Returns_CorrectValue1()
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{
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var tc = new TestClock();
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var target = new CustomClock(tc.GetTime);
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Assert.AreEqual(TestClock.DefaultTime, target.GetTime());
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}
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[TestMethod]
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public void CustomClock_GetTime_Returns_CorrectValue2()
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{
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var time = new DateTime(2020, 1, 2, 3, 4, 5, 6, DateTimeKind.Local);
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var target = new CustomClock(() => time);
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Assert.AreEqual(time, target.GetTime());
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}
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}
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}

‎IClock.Tests/ForwardOnlyClockTests.cs‎

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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System;
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namespace IClock.Tests
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{
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[TestClass]
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public class ForwardOnlyClockTests
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{
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[TestMethod]
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[ExpectedException(typeof(ArgumentNullException))]
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public void ForwardOnlyClock_Throws_OnNullArgument() => new ForwardOnlyClock(null);
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[TestMethod]
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public void ForwardOnlyClock_GetTime_Returns_ForwardTime()
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{
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var tc = new TestClock();
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var target = new ForwardOnlyClock(tc);
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var t1 = target.GetTime();
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tc.Add(TimeSpan.FromSeconds(-1)); // Set clock back 1 second
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var t2 = target.GetTime();
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Assert.AreEqual(t1, t2); // Time should be same
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tc.Add(TimeSpan.FromSeconds(3)); // Add 2 seconds
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var t3 = target.GetTime();
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Assert.AreEqual(t1.AddSeconds(2), t3); // Time should be at +2 seconds now.
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}
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}
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}

‎IClock.Tests/IClock.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netcoreapp3.1</TargetFramework>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
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<PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
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<PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
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<PackageReference Include="coverlet.collector" Version="1.2.0" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\IClock\IClock.csproj" />
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</ItemGroup>
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</Project>

‎IClock.Tests/TestClockTests.cs‎

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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System;
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namespace IClock.Tests
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{
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[TestClass]
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public class TestClockTests
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{
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[TestMethod]
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public void TestClock_GetTime_Returns_DefaultTime()
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{
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var target = new TestClock();
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Assert.AreEqual(TestClock.DefaultTime, target.GetTime());
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}
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[TestMethod]
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public void TestClock_GetTime_Returns_GivenTime()
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{
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var time = new DateTime(2020, 1, 2, 3, 4, 5, 6, DateTimeKind.Local);
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var target = new TestClock(time);
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Assert.AreEqual(time, target.GetTime());
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}
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[TestMethod]
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public void TestClock_Tick_DefaultIncrement_IsOneSecond()
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{
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var target = new TestClock();
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var t1 = target.GetTime();
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target.Tick();
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var t2 = target.GetTime();
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Assert.AreEqual(TimeSpan.FromSeconds(1), t2 - t1);
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}
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[TestMethod]
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public void TestClock_Tick_Uses_GivenIncrement()
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{
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var ts = TimeSpan.FromDays(Math.PI);
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var target = new TestClock(TestClock.DefaultTime, ts);
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var t1 = target.GetTime();
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target.Tick();
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var t2 = target.GetTime();
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Assert.AreEqual(ts, t2 - t1);
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}
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[TestMethod]
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public void TestClock_Set_ChangesTime()
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{
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var time = new DateTime(2020, 1, 2, 3, 4, 5, 6, DateTimeKind.Local);
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var target = new TestClock();
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target.Set(time);
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Assert.AreEqual(time, target.GetTime());
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}
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[TestMethod]
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public void TestClock_Add_AddsTime()
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{
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var target = new TestClock();
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var timespan = TimeSpan.FromSeconds(Math.PI);
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var t1 = target.GetTime();
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target.Add(timespan);
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var t2 = target.GetTime();
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Assert.AreEqual(timespan, t2 - t1);
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}
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private DateTimeOffset GetTime1() => TestClock.GetDeterministicRandomTime();
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private DateTimeOffset GetTime2() => TestClock.GetDeterministicRandomTime();
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[TestMethod]
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public void TestClock_GetDeterministicRandomTime_IsDeterministic()
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{
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// Each invocation within the same method should return the same value
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Assert.AreEqual(TestClock.GetDeterministicRandomTime(), TestClock.GetDeterministicRandomTime());
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// Each invocation from different methods should (likely) return the different values
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Assert.AreNotEqual(GetTime1(), GetTime2());
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Assert.AreNotEqual(TestClock.GetDeterministicRandomTime(TimeSpan.Zero, "A"), TestClock.GetDeterministicRandomTime(TimeSpan.Zero, "B"));
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}
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[TestMethod]
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public void TestClock_TestVector() // Do not change method name or fix expected value when you do
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{
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// Pre-calculated test vector
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var expected = new DateTimeOffset(635894622187178864L, TimeSpan.Zero);
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// Make sure GetRandomTime() returns a deterministic "random" time
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Assert.AreEqual(expected, TestClock.GetDeterministicRandomTime());
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// Make sure a second invocation doesn't change the returned time
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Assert.AreEqual(expected, TestClock.GetDeterministicRandomTime());
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}
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[TestMethod]
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public void TestClock_GetDeterministicRandomTime_UsesGivenOffset()
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{
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var offset = TimeSpan.FromMinutes(123);
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Assert.AreEqual(offset, TestClock.GetDeterministicRandomTime(offset).Offset);
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}
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}
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}

‎IClock.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.0.30413.136
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IClock", "IClock\IClock.csproj", "{76E771C0-D150-4A4F-9734-33F9E06D17D9}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IClock.Tests", "IClock.Tests\IClock.Tests.csproj", "{4D016A5A-EF63-4FBF-A661-87E7BF7E0098}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{76E771C0-D150-4A4F-9734-33F9E06D17D9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{76E771C0-D150-4A4F-9734-33F9E06D17D9}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{76E771C0-D150-4A4F-9734-33F9E06D17D9}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{76E771C0-D150-4A4F-9734-33F9E06D17D9}.Release|Any CPU.Build.0 = Release|Any CPU
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{4D016A5A-EF63-4FBF-A661-87E7BF7E0098}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{4D016A5A-EF63-4FBF-A661-87E7BF7E0098}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{4D016A5A-EF63-4FBF-A661-87E7BF7E0098}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{4D016A5A-EF63-4FBF-A661-87E7BF7E0098}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {C0707B68-2C97-4742-8B11-A4DBC094A721}
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EndGlobalSection
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EndGlobal

‎IClock/CustomClock.cs‎

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using System;
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namespace IClock
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{
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public class CustomClock : IClock
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{
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private readonly Func<DateTimeOffset> _gettimefunc;
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public CustomClock(Func<DateTimeOffset> getTimeFunction)
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{
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_gettimefunc = getTimeFunction ?? throw new ArgumentNullException(nameof(getTimeFunction));
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}
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public DateTimeOffset GetTime() => _gettimefunc();
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}
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}

‎IClock/ForwardOnlyClock.cs‎

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using System;
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namespace IClock
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{
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public class ForwardOnlyClock : IClock
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{
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private IClock _internalclock;
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private DateTimeOffset _lasttime;
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private object _lock = new object();
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public ForwardOnlyClock(IClock clock)
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{
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_internalclock = clock ?? throw new ArgumentNullException(nameof(clock));
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_lasttime = clock.GetTime();
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}
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public DateTimeOffset GetTime()
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{
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var current = _internalclock.GetTime();
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lock (_lock)
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{
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if (current.CompareTo(_lasttime) > 0)
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_lasttime = current;
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return _lasttime;
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}
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}
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}
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}

‎IClock/IClock.cs‎

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using System;
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namespace IClock
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{
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public interface IClock
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{
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DateTimeOffset GetTime();
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}
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}

‎IClock/IClock.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard1.0</TargetFramework>
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<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
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<Authors>RobIII</Authors>
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<Company>Devcorner.nl</Company>
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<Copyright>Copyright © 2020 Devcorner.nl</Copyright>
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<PackageLicenseExpression>MIT</PackageLicenseExpression>
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</PropertyGroup>
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</Project>

‎IClock/LocalClock.cs‎

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using System;
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namespace IClock
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{
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public class LocalClock : IClock
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{
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public DateTimeOffset GetTime() => DateTimeOffset.Now;
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}
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}

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