NFluent 2.1.0

There is a newer version of this package available.
See the version list below for details.
dotnet add package NFluent --version 2.1.0
NuGet\Install-Package NFluent -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="NFluent" Version="2.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add NFluent --version 2.1.0
#r "nuget: NFluent, 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 NFluent as a Cake Addin
#addin nuget:?package=NFluent&version=2.1.0

// Install NFluent as a Cake Tool
#tool nuget:?package=NFluent&version=2.1.0

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 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.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.3 is compatible.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 was computed.  netstandard2.1 was computed. 
.NET Framework net20 is compatible.  net30 is compatible.  net35 is compatible.  net40 is compatible.  net403 was computed.  net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 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)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

NuGet packages (12)

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


multi dimension dictionary with expiration mechanism for cache invalidation


Package pour faciliter la mise en place de tests.

GitHub repositories (15)

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

Repository Stars
More than a ReClass port to the .NET platform.
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.
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
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
3.0.3 7,635 1/12/2024
3.0.3-beta 342 12/13/2023 6,711 12/12/2023 892 10/13/2023 56,891 6/9/2023 20,234 5/6/2023 9,950 3/3/2022 595 2/27/2022 583 2/27/2022 606 2/24/2022
2.8.0 449,239 2/4/2022
2.7.2 253,486 4/8/2021
2.7.1 93,558 12/29/2020
2.7.0 303,138 2/11/2020
2.6.0 203,570 8/19/2019
2.5.0 163,529 3/12/2019
2.4.0 115,005 10/2/2018
2.3.1 89,917 6/12/2018
2.3.0 2,211 6/9/2018
2.2.0 87,391 2/10/2018
2.1.1 27,943 1/5/2018
2.1.0 12,131 12/10/2017
2.0.0 63,727 6/27/2017
2.0.0-alpha-44 2,353 5/10/2017
1.3.1 225,642 7/28/2014
1.2.0 9,127 6/16/2014
1.1.0 5,193 2/14/2014
1.0.0 4,305 12/31/2013
0.11.0 2,273 11/26/2013
0.9.0 2,311 8/6/2013
0.8.0 2,176 7/6/2013
0.7.0 2,003 6/4/2013
0.6.0 1,968 5/19/2013
0.5.0 1,984 4/21/2013

V 2.10


New feature(s):

* Enumerable:

* Breaking change: equality for Enumerable is now content based (instead of reference based). See issue #209. You can revert adding: Check.EqualMode = EqualityMode.Equals in your test set up code

* New check ContainsOnlyElementsThatMatch which checks that all items verify a given predicate.

* New Check: IsOneOf checks if the value belongs to a list of authorized value. Check.That(sut).IsOneOf(a, b, c, ...) fails if sut is different from all valid values

* Improved error messages for IsEqualTo() on floating point types. Difference is displayed when small, suggestion to use IsCloseTo when difference is really small (#205).

* Initial support for dynamics (issue #85):

* Entry point is: Check.ThatDynamic()

* Available checks are: IsNotNull(), IsEqualTo(...), IsSameReferenceAs(...)

* And keyword is available

* Not keyword is available


Bug Fixe(s):

* Fixed support of array types for HasFielsWithSameValues (issue #200)

* Fixed some stack overflow exceptions (issue #210).

* Fixed confusing examples about array item related checks in the readme

V 2.00


New feature(s):

* Support for NetStandard > 1.3

* Support for Net.Core > 1.0

* Compatible for Net > 2.0

* Built for: 2.0, 3.0, 3.5, 4.0, 4.5, NetStandard 1.3

* All: introduce: HasSameValueAs(x) that perform comparison using 'operator==' instead of 'Equals'.

* All: introduce: HasAValueDifferentFrom(x) that perform comparison using 'operator!=' instead of '!Equals'.

* Streams: introduce HasSameSequenceOfBytesAs() check.

* Numbers: introduce IsPositiveOrZero() check.

* Numbers: introduce IsNegativeOrZero() check.

* FloatingNumbers (float, double): introduce IsCloseTo(expected, within) check for estimated value.

* Exception: introduce the DueTo<InnerException> as an extension to Throws<Exception>. It verifies that the checked exception was triggered by a specific exception. This is done by scanning the 'innerException' chain until the expected type is identified. Further checking is done on the inner exception.

* Exception: introduce WithProperties( expression, expectedValue) to check the value of any exception members, thanks to a selector expression.

* IEnumerable: introduce HasElementAt(int index) which checks for an item as a specific index. Furthermore, this item can be checked as well thanks to 'Which'. E.g: Check.That(_collection).HasElementAt(3).Which.IsEqualTo("foo").

* IEnumerable: introduce HasFirstElement() which checks for the first item. Furthermore, this item can be checked as well thanks to 'Which'. E.g: Check.That(_collection).HasFirstElement().Which.IsEqualTo("foo").

* IEnumerable: introduce HasLastElement() which checks for the last item. Furthermore, this item can be checked as well thanks to 'Which'. E.g: Check.That(_collection).HasLastElement().Which.IsEqualTo("foo").

* IEnumerable: introduce HasOneElementOnly() which checks for the first and single item. Furthermore, this item can be checked as well thanks to 'Which'. E.g: Check.That(_collection).HasOneElementOnly().Which.IsEqualTo("foo").

* IEnumerable: introduce HasElementThatMatches( bool predicate()) which checks that an enumerable has at least on item matching the given predicate. You can use 'Which' to check further this item. E.g.: Check.That(_collection).HasItemThatMatches((_) => _.StartWith("foo")).Which.IsEqualTo("foobar").

* IDictionary<K,V>: now explicitely supported.

* IDictionary<K,V>: introduce ContainsEntry<K, V>(K key, V value) which checks that a dictionary contains a specific value for a given key.

* Hashtable: now explicitely supported.



* IEnumerable: improved description within error messages: partial dump around first difference for large sets

* IDictionnary: no longer supported. Hashtable is supported instead

* Numbers: introduce IsStrictlyPositive() as a substitute for IsPositive() which is now obsolete.

* Numbers: introduce IsStrictlyNegative() as a substitute for IsNegative() which is now obsolete.

* Numbers: introduce IsStrictlyGreaterThan() as a substitute for IsGreaterThan() which is now obsolete.

* Numbers: introduce IsStrictlyLessThan() as a substitute for IsLessThan() which is now obsolete.

* Floating Numbers: introduce IsCloseTo() to check if a number is close to another one.

* Check.ThatCode(...).Throws<T>() now requires T to be an exception. This restriction ensures only Exceptions are proposed in autocompletion.

* Improve error messages (consistency and relevance).

* Strings: generate specific error message using IsEqualTo() when the actual string is empty

* Strings: generate specific error message using IsEqualTo() when the expected string is empty

* Strings: provides part of string where first difference occurs even when strings have different lenghts

* Objects: IsSameReferenceAs supersede IsSameReferenceThan (now flagged as obsolete)

* Objects: Dump hascodes only when NFluent cannot highligth difference.

* Check.That(Action) can no longer be used (error, obsolete)

* Check.That(Func<T>) can no longer be used (error, obsolete)

* Simplify the way you can extend NFluent by adding your own checks. Now, you can call: var checker = ExtensibilityHelper.ExtractChecker(check);

at the beginning of your check extension method, and then rely on its ExecuteCheck() or BuildMessage() helper methods to do the job. Note: the Checker is part of the NFluent.Extensibility namespace.

* Reviewing of public elements: Some classes are no longer public. They should never have been in the first case.

* Signature of ILambdaExceptionCheck has been updated to refer the checked exception type (instead of RunTrace). This is a breaking change for edge cases, that will impact your extension method on exceptions, if any; it can also impact your tests if you use the explicit signature.


Bug Fixe(s):

* Fix the inversion between expected and actual error message for the .WithMessage checks on exception.

* Fix the issue with null value on Check.That(...).IsBefore(...)

* HasFieldsWithSameValues now recurse along the hierarchy class (Fix for #141)

* Fix stack overflow triggered by HasFieldsWithSameValues() on object with reference loop (#148)

* Properly escaped strings when generating error messages.

* GitHub issues: #124, #133, #141, #148, #153, #154, #156, #159, #164, #165, #167, #174, #177, #178, #179, #187