Top 20 NuGet mocking Packages

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NSubstitute is a friendly substitute for .NET mocking frameworks. It has a simple, succinct syntax to help developers write clearer tests. NSubstitute is designed for Arrange-Act-Assert (AAA) testing and with Test Driven Development (TDD) in mind.
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Moq is the most popular and friendly mocking framework for .NET
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It's faking amazing! The easy mocking framework for .NET that works great in C# and VB.NET alike. No need to know the difference between a stub, a mock or a spy, everything's a fake! The easy to use, refactoring friendly API makes faking a breeze.
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Unit testing framework for Sitecore.
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Unit testing framework for Sitecore.
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Unit testing framework for Sitecore.
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Utilities to streamline unit testing in Dynamics CRM 2016 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
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Utilities to streamline unit testing in Dynamics CRM 2015 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
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Utilities to streamline unit testing in Dynamics CRM 365 by faking the IOrganizationService against an In-Memory context which runs blazing fast.
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Auto-mocking Autofac container that uses NSubstitute.
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Pester provides a framework for running BDD style Tests to execute and validate PowerShell commands inside of PowerShell and offers a powerful set of Mocking Functions that allow tests to mimic and mock the functionality of any command inside of a piece of PowerShell code being tested. Pester tests ...
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Utilities to streamline unit testing in Dynamics CRM 2011 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
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Utilities to streamline unit testing in Dynamics CRM 2013 by faking the IOrganizationService against an In-Memory context which runs blazingly fast.
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A Collection of fakes for various Microdot components, used for testing. Part of the Microdot framework. See also Gigya.Microdot.Testing.
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The most powerful free mocking library available for .NET developers.
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Tools to help write tests for Microdot services.
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Foq

Foq is a lightweight thread-safe mocking library for F#, C#, and VB with a similar API to Moq.
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Unit testing framework for Sitecore.
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It's what a Mocking Framework should be. Powerful. And it's the first of its kind.
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Rhino Mocks is using Castle Dynamic Proxy (http://www.castleproject.org/dynamicproxy/index.html) to handle proxying the types it needs to mock. The Dynamic Proxy project has been invaluable resource and made creating Rhino Mocks possible.