RSCG – Rocks

RSCG – Rocks
 
 

Creating mocks for testing interfaces/classes

This is how you can use Rocks .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <IsPackable>false</IsPackable>
    <IsTestProject>true</IsTestProject>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
    <PackageReference Include="coverlet.collector" Version="3.2.0" />
    <PackageReference Include="Rocks" Version="7.1.0" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\MockRock\MockRock.csproj" />
  </ItemGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

</Project>

The code that you will use is

namespace TestClock;

[TestClass]
public class TestClock
{
    [TestMethod]
    public void TestMyClock()
    {
        var expectations = Rock.Create<IMyClock>();
        expectations.Methods().GetNow().Returns(DateTime.Now.AddYears(-1));
        
        var mock = expectations.Instance();
        var data= mock.GetNow();
        Assert.AreEqual(DateTime.Now.Year -1,data.Year);
        expectations.Verify();
    }
}

The code that is generated is

using Rocks.Extensions;
using System.Collections.Generic;
using System.Collections.Immutable;
#nullable enable

namespace MockRock
{
	internal static class CreateExpectationsOfIMyClockExtensions
	{
		internal static global::Rocks.Expectations.MethodExpectations<global::MockRock.IMyClock> Methods(this global::Rocks.Expectations.Expectations<global::MockRock.IMyClock> @self) =>
			new(@self);
		
		internal static global::MockRock.IMyClock Instance(this global::Rocks.Expectations.Expectations<global::MockRock.IMyClock> @self)
		{
			if (!@self.WasInstanceInvoked)
			{
				@self.WasInstanceInvoked = true;
				var @mock = new RockIMyClock(@self);
				@self.MockType = @mock.GetType();
				return @mock;
			}
			else
			{
				throw new global::Rocks.Exceptions.NewMockInstanceException("Can only create a new mock once.");
			}
		}
		
		private sealed class RockIMyClock
			: global::MockRock.IMyClock
		{
			private readonly global::System.Collections.Generic.Dictionary<int,global::System.Collections.Generic.List<global::Rocks.HandlerInformation>> handlers;
			
			public RockIMyClock(global::Rocks.Expectations.Expectations<global::MockRock.IMyClock> @expectations)
			{
				this.handlers = @expectations.Handlers;
			}
			
			[global::Rocks.MemberIdentifier(0,"global::System.DateTime GetNow()")]
			public global::System.DateTime GetNow()
			{
				if (this.handlers.TryGetValue(0,out var @methodHandlers))
				{
					var @methodHandler = @methodHandlers[0];
					@methodHandler.IncrementCallCount();
					var @result = @methodHandler.Method is not null ?
						((global::System.Func<global::System.DateTime>)@methodHandler.Method)() :
						((global::Rocks.HandlerInformation<global::System.DateTime>)@methodHandler).ReturnValue;
					return @result!;
				}
				
				throw new global::Rocks.Exceptions.ExpectationException("No handlers were found for global::System.DateTime GetNow()");
			}
			
			[global::Rocks.MemberIdentifier(1,"global::System.DateTime GetUtcNow()")]
			public global::System.DateTime GetUtcNow()
			{
				if (this.handlers.TryGetValue(1,out var @methodHandlers))
				{
					var @methodHandler = @methodHandlers[0];
					@methodHandler.IncrementCallCount();
					var @result = @methodHandler.Method is not null ?
						((global::System.Func<global::System.DateTime>)@methodHandler.Method)() :
						((global::Rocks.HandlerInformation<global::System.DateTime>)@methodHandler).ReturnValue;
					return @result!;
				}
				
				throw new global::Rocks.Exceptions.ExpectationException("No handlers were found for global::System.DateTime GetUtcNow()");
			}
			
		}
	}
	
	internal static class MethodExpectationsOfIMyClockExtensions
	{
		internal static global::Rocks.MethodAdornments<global::MockRock.IMyClock,global::System.Func<global::System.DateTime>,global::System.DateTime> GetNow(this global::Rocks.Expectations.MethodExpectations<global::MockRock.IMyClock> @self) =>
			new global::Rocks.MethodAdornments<global::MockRock.IMyClock,global::System.Func<global::System.DateTime>,global::System.DateTime>(@self.Add<global::System.DateTime>(0,new global::System.Collections.Generic.List<global::Rocks.Argument>()));
		internal static global::Rocks.MethodAdornments<global::MockRock.IMyClock,global::System.Func<global::System.DateTime>,global::System.DateTime> GetUtcNow(this global::Rocks.Expectations.MethodExpectations<global::MockRock.IMyClock> @self) =>
			new global::Rocks.MethodAdornments<global::MockRock.IMyClock,global::System.Func<global::System.DateTime>,global::System.DateTime>(@self.Add<global::System.DateTime>(1,new global::System.Collections.Generic.List<global::Rocks.Argument>()));
	}
}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/Rocks