Neovolve.Streamline.NSubstitute 2.1.0

.NET Standard 2.1
dotnet add package Neovolve.Streamline.NSubstitute --version 2.1.0
NuGet\Install-Package Neovolve.Streamline.NSubstitute -Version 2.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Neovolve.Streamline.NSubstitute" Version="2.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Neovolve.Streamline.NSubstitute --version 2.1.0
#r "nuget: Neovolve.Streamline.NSubstitute, 2.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Neovolve.Streamline.NSubstitute as a Cake Addin
#addin nuget:?package=Neovolve.Streamline.NSubstitute&version=2.1.0

// Install Neovolve.Streamline.NSubstitute as a Cake Tool
#tool nuget:?package=Neovolve.Streamline.NSubstitute&version=2.1.0


Neovolve.Streamline provides NuGet packages to simplify the unit testing setup (Arrange in AAA unit testing) of classes and their dependencies. The Neovolve.Streamline package provides the base logic to creating a SUT (System Under Test) along with any service dependencies that it requires. Other packages (such as Neovolve.Streamline.NSubstitute) provide the bridge between Neovolve.Streamline and another tool that creates the service dependencies.

GitHub license Actions Status

Package NuGet
Neovolve.Streamline Nuget Nuget
Neovolve.Streamline.NSubstitute Nuget Nuget

Use Case

Consider the following class and the setup required to unit test it.

public class Something
    public Something(
        IFirst first,
        ISecond second,
        IThird third,
        IFourth fourth,
        IFifth fifth)

    public void FirstAction()

    public void SecondAction()

    public void ThirdAction()

    public void FourthAction()

    public void FifthAction()

There are five dependencies to this test class and five members to unit test. A test Arrange for any of these unit tests may look something like the following (using NSubstitute as the mocking library).

using NSubstitute;

public class SomethingTests
    public void FirstActionDoesXYZWhenABC()
        var first = Substitute.For<IFirst>();
        var second = Substitute.For<ISecond>();
        var third = Substitute.For<IThird>();
        var fourth = Substitute.For<IFourth>();
        var fifth = Substitute.For<IFifth>();

        // Continue Arrange to configure these service for their behaviours

        var sut = new Something(first, second, third, fourth, fifth);

        // Act

        // Assert

If you consider that each one of the actions has five business scenarios to validate, that is at least 25 unit test methods that duplicate the above Arrange code. The Neovolve.Streamline.NSubstitute package can simplify this by automatically creating both the service depedencies and the SUT itself.

For example, the above Arrange can be reduced to just the following:

using NSubstitute;

public class SomethingTests : Tests<Something>
    public void FirstActionDoesXYZWhenABC()
        // Configure these service for their behaviours

        // Act

        // Assert


This package brings several advantages.

  • Service dependencies are automatically created
  • The SUT instance is automatically created with any required service dependencies
  • Adding, removing or re-ordering constructor parameters have limited or no impact on existing unit tests
  • Services and the SUT are automatically disposed via IDisposable and/or IAsyncDisposable
    • NOTE: This requires that either the test framework implicitly supports disposal or manual integration between the test framework and disposal is required.
    • xUnit implicitly supports IDisposable but does not yet support IAsyncDisposable until v3 is released. In the meantime, the test class can use IAsyncLifetime to support IAsyncDisposable. See for further information.

Examples using NSubstitute

SUT with multiple parameters
SUT with single parameter
SUT with no constructor parameters
SUT with custom services
SUT using keyed services
SUT declared as internal having public interface
SUT declared as internal via proxy
Using test class constructor parameters
SUT as partial mock
SUT as full mock
SUT as abstract class


This project is supported by JetBrains

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.1 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
2.1.0 0 9/22/2023
2.0.1-beta0001 0 9/22/2023
2.0.0 112 8/28/2023
2.0.0-beta0009 70 8/28/2023
2.0.0-beta0008 64 8/28/2023
2.0.0-beta0007 47 8/28/2023
1.3.0 191 7/27/2023
1.2.1-beta0001 50 7/27/2023
1.2.0 4,955 5/11/2022
1.2.0-beta0003 99 5/11/2022
1.1.2 1,778 4/2/2022
1.1.2-beta0001 100 4/2/2022
1.1.1 2,289 9/18/2021
1.1.1-beta0001 185 9/18/2021
1.1.0 282 9/16/2021
1.0.1-beta0003 185 9/16/2021
1.0.1-beta0001 184 1/19/2021
1.0.0 741 1/18/2021
0.1.0-beta0009 195 1/18/2021
0.1.0-beta0005 203 1/18/2021
0.1.0-beta0002 227 1/17/2021