Top 20 NuGet assertion Packages

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Shouldly - Assertion framework for .NET. The way asserting *Should* be
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CodeJam is a set of handy reusable .NET components that can simplify your daily work and save your time when you copy and paste your favorite helper methods and classes from one project to another.
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A high-performance, extensible argument validation library.
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Easy-to-use fluent assertions with actually useful failure messages.
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Assertion Error (assertion-error) binding library for Bridge.NET projects.
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Testify is a unit test assertions, test data creation and contract verification framework. It's not dependent on any specific unit testing framework.
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Testify is a unit test assertions, test data creation and contract verification framework. It's not dependent on any specific unit testing framework. Testify.Moq adds mocking support via Moq.
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Simple fluent assertions for .NET.
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A minimalistic guard library with Resharper contract annotations
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Assert Extensions for the Microsoft Test Framework - MSTest V2
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Use code snippet 'assertion' to get the declaration at the top of the file. Then just use Assert.Equal(...) and the like.
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Little helper on assertion.
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Guardly is a defensive programming framework
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Test Run Extensions for the Microsoft Test Framework - MSTest V2
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A JavaScript library with function argument assertions, a function parser and assertion wrapper functionality. By wrapping your functions you get defined, notNull, bool, func, number, object, string and notEmpty assertions for free. The interface is specially optimised for the Visual Studio JavaScri...
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A fluent assertion module for PowerShell. Part of the PSST PowerShell Suite for Testing.
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A class invariants helper library
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Adds the source code statement which caused the assertion failure. Usage example here: https://github.com/GrahamTheCoder/Assertion-Source-Info/tree/master#how-to-use-with-nunit