.NET Standard 2.0 .NET Framework 3.5
This is a prerelease version of NFluent.
dotnet add package NFluent --version
NuGet\Install-Package NFluent -Version
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="NFluent" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add NFluent --version
#r "nuget: NFluent,"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install NFluent as a Cake Addin
#addin nuget:?package=NFluent&version=

// Install NFluent as a Cake Tool
#tool nuget:?package=NFluent&version=

NFluent is an ergonomic check library which aims to fluent your .NET TDD experience (based on simple Check.That() check statements). NFluent aims your tests to be fluent to write (with an happy 'dot' auto completion experience), fluent to read (i.e. as close as possible to plain English expression), but also fluent to troubleshoot, in a less-error-prone way comparing to the classical .NET test frameworks. NFluent is directly, but also freely, inspired by the awesome Java FEST fluent check/reflection library (

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net35 net40 net403 net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48 net481
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETFramework 3.5

    • No dependencies.
  • .NETFramework 4.6

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages (8)

Showing the top 5 NuGet packages that depend on NFluent:

Package Downloads

NFluent checks for checking HttpResponseMessages.


Iago is a tool to write bdd like tests in kre. use `iago.runner` to execute your tests


A library for writing flexible and easy to maintain acceptance tests


Iago runner is a tool to run bdd like tests in kre


multi dimension dictionary with expiration mechanism for cache invalidation

GitHub repositories (13)

Showing the top 5 popular GitHub repositories that depend on NFluent:

Repository Stars
More than a ReClass port to the .NET platform.
The FileHelpers are a free and easy to use .NET library to read/write data from fixed length or delimited records in files, strings or streams
WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on the functionality from, but extended with more functionality.
This repository was deprecated, use:
Entity Component System framework aiming for syntax and usage simplicity with maximum performance for game development.
Version Downloads Last updated 4,207 3/3/2022 81 2/27/2022 78 2/27/2022 71 2/24/2022
2.8.0 189,068 2/4/2022
2.7.2 179,647 4/8/2021
2.7.1 78,192 12/29/2020
2.7.0 248,096 2/11/2020
2.6.0 172,350 8/19/2019
2.5.0 142,559 3/12/2019
2.4.0 105,395 10/2/2018
2.3.1 79,637 6/12/2018
2.3.0 1,568 6/9/2018
2.2.0 70,275 2/10/2018
2.1.1 25,332 1/5/2018
2.1.0 11,355 12/10/2017
2.0.0 61,703 6/27/2017
2.0.0-alpha-44 1,825 5/10/2017
1.3.1 206,247 7/28/2014
1.2.0 8,573 6/16/2014
1.1.0 4,406 2/14/2014
1.0.0 2,013 12/31/2013
0.11.0 1,674 11/26/2013
0.9.0 1,748 8/6/2013
0.8.0 1,605 7/6/2013
0.7.0 1,426 6/4/2013
0.6.0 1,385 5/19/2013
0.5.0 1,443 4/21/2013

# V 3.0.0

## Major changes

* You can execute multiple check as a single batch and get every failures, instead of the first one. This can be achieved using:

* `Check.StartBatch`: stores the result of each subsequent check(s) and notifies all the errors when the returned object is disposed. Such as






Note that any actual exception thrown during the check phase will prevent any subsequent check from behind executed (1) and may not be reported as it may be replaced by an assertion failure exception.

This comes from C# exeption handling logic.

* You can provide anonymous types and tuples when using IsEqualTo against any type. The check will be made against all

_sut_'s propertie.

* NFluent supports Net 3.5 SP1, Net. 4.5.2 +, Net Standard 2.0+. Dropped support for Net Framework 2.0, 3.0, and 4.0, as well Net Standard<2.0.

If you can't upgrade your framework version to a supported one, please use NFluent 2.7.1.

## New Checks

* `Is`: Checks if _sut == expected_. This is a strongly typed equivalent to `IsEqualTo`.

* `IsGreaterOrEqualThan`: Checks if _sut_ >= _expected_.

* `IsLessOrEqualThan`: Checks if _sut_ <= _expected_.

## New feautres

* You can provide custom comparer for any type, using `Check.RegisterComparer` like this `Check.Register<MyType>(MyCustomComparer)`.

You can also use `RegisterLocalComparer` to limit its usage to a declaration scope.

## Breaking changes

* Equality logic changed for `IDictionary`: dictionaries are considered equals if they have the same keys and

the same values for each key. In NFluent V2, entries needed to be declared in the some order or else they were considered as **different** but **equivalent**.

* You need to specify

* `IsAnInstanceOf<nullableType>(null)` now fails (with an appropriate message). Previously, it did succeed. But,

as captured in issue #68, this behavior was triggered by a bug and kept due to a poor error message when fixed.

* The `IStructCheck<T>` interface has been removed as well as associated extensibility helper. Those were dedicated

to value `types`, you can migrate your existing extensions to the `ICheck<T>` type instead. Please open an issue if

you need help.

## Fixes

* HasFieldWithSameValues resulted in false positive when string fields had the same value.

* IsNotEqualTo now properly preserves expected type

* Improved rerporting of differences for enumerations and dictionaries to make them more consistent and fixed some inaccuracies.

## GitHub Issues

* #325, #327, #330, #332

### Obsolete

#### Marked as obsolet

* `ThatAsyncCode`: you can now use `ThatCode` even for async methods.

Here is the list of methods, classes and other obsolete stuff that have been removed in this version as well

as workaround advices.

* Drop support for Net 2.0 and 3.0: keep using NFluent V2.x versions if you support for these.

* `Check.ThatEnum`has been removed. You must use `Check.That` instead.

* `ILambdaCheck`: the definition was kept to prevent breaking build, but it was no longer used. If this is a

problem for you, open an issue

* `IsPositive` (available for numbers): please use `IsStrictlyPositive` instead.

* `IsNegative` (available for numbers): please use `IsStrictlyNegative` instead.

* `IsLessThan` (available for numbers): please use `IsStrictlyNegative` instead.

* `IsGreaterThan` (available for numbers): please use `IsStrictlyGreaterThan` instead.

* `IsSameReferenceThan`: please use `IsSameReferenceAs` instead.

* `HasFieldsEqualToThose`: please use `HasFieldsWithSameValues` instead.

* `HasFieldsNotEqualToThose`: please use `HasNotFieldsWithSameValues` instead.

* `IsAFaillingCheckWithMessage`: please use `IsAFailingCheckWithMessage` instead.

* `IsAFaillingCheck`: please use `IsAFailingCheck` instead.

* `Properties` (available for enumeration): please use `Extracting` instead.

* `Checker.BuildLinkWhich` (used for custom extension): please use `ExtensibilityHelper.BuildCheckLinkWhich` instead.

* `Checker.ExecuteCheckAndProvideSubItem` (used for custom extension): please 'ExtensibilityHelper' static class methods instead.

# V 2.8.0

## Breaking changes

* Removed typed overload for IsEqualTo. This may degrade autocompletion somewhat;

* Equality comparison logic has been slightly revised to take failing `Equals` result when the expected type provides a specific implementation (only success was used so far).

## New check

* Is : replaces the typed overload for IsEqualTo

## GitHub Issue

* #335

# V 2.7.2

## Fixes

* HasFieldWithSameValues resulted in false positive when string fields had the same value.

* IsZero failed for very small double (<1E-28) in previous versions.

* IsEquivalentTo was not permissive enougth for dictionaries.

## GitHub Issues

* #331, #333#

# V 2.7.1

# Fixes

* HasFieldsWithSameValues failed to properly compare when the expected value contained duplicate string.

More generally, instances where only checked once for equality; any subsequent check was assumed to be succesful.

This could lead to false positive (i.e. checks succeeded when it should have failed).

This regression was introduced by V 2.2.0 in 02/2018. Sorry about that.

# GitHub Issues

* #331