AutoFixture | open source library for .NET | Unit Testing library

 by   AutoFixture C# Version: v4.18.0 License: MIT

kandi X-RAY | AutoFixture Summary

kandi X-RAY | AutoFixture Summary

AutoFixture is a C# library typically used in Testing, Unit Testing applications. AutoFixture has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

(Jump straight to the CheatSheet if you just want to see some code samples right away.). AutoFixture is designed to make Test-Driven Development more productive and unit tests more refactoring-safe. It does so by removing the need for hand-coding anonymous variables as part of a test's Fixture Setup phase. Among other features, it offers a generic implementation of the Test Data Builder pattern. When writing unit tests, you typically need to create some objects that represent the initial state of the test. Often, an API will force you to specify much more data than you really care about, so you frequently end up creating objects that has no influence on the test, simply to make the code compile.
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            kandi-support Support

              AutoFixture has a medium active ecosystem.
              It has 3016 star(s) with 334 fork(s). There are 96 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 40 open issues and 618 have been closed. On average issues are closed in 101 days. There are 18 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of AutoFixture is v4.18.0

            kandi-Quality Quality

              AutoFixture has 0 bugs and 0 code smells.

            kandi-Security Security

              AutoFixture has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              AutoFixture code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              AutoFixture is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              AutoFixture releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.
              AutoFixture saves you 5 person hours of effort in developing the same functionality from scratch.
              It has 16 lines of code, 0 functions and 1140 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

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            AutoFixture Key Features

            No Key Features are available at this moment for AutoFixture.

            AutoFixture Examples and Code Snippets

            No Code Snippets are available at this moment for AutoFixture.

            Community Discussions

            QUESTION

            Can't Find Constructor on Generic Class Activator
            Asked 2022-Mar-25 at 12:02

            I'm trying to create an AutoFixture.ISpecimenBuilder for this class:

            ...

            ANSWER

            Answered 2022-Mar-25 at 12:02

            Activator.CreateInstance() only looks for public constructors by default. If you want to look for other scopes of constructor, you need to use the overload with BindingFlags.

            The flags needed are:

            Source https://stackoverflow.com/questions/71592400

            QUESTION

            How to mock and setup local variable
            Asked 2022-Mar-16 at 09:00

            I am working on .NET CORE 3.1 nUnit tests with mock and autoFixture library. I need to mock telemetry variable not sure how to acheive it?

            ...

            ANSWER

            Answered 2022-Mar-16 at 09:00

            Whether we pass the ITelemetryInitializer in as a parameter to RunAsync() or pass it into the class via the constructor and use it in the method, the problem is the same. We have, by stating that the parameter is of type ITelemetryInitializer, told anyone using the code (including ourselves) that anything which implements that interface can be used here.

            We then cast the passed in instance to a concrete class TelemetryInitializerStandard and use some property (TenantId?) that is on the concrete class but not included in the interface. This breaks the 'contract' that ITelemetryInitializer is a sufficient parameter.

            In a perfect world, the solution would be to extend the ITelemetryInitializer interface to include the properties from TelemetryInitializerStandard that we need, or, replace the ITelemetryInitializer parameter with a TelemetryInitializerStandard one. (The problem is not that we are using the TelemetryInitializerStandard but the mismatch between ITelemetryInitializer and TelemetryInitializerStandard).

            Too often it is not a perfect world and we do not have full control over the code we use (e.g. someone else owns the interface and we cannot change it)

            It is possible to mock a concrete class (at least with Moq 4.17.2) but we can only mock properties/methods which are virtual

            Source https://stackoverflow.com/questions/71474429

            QUESTION

            AutoFixture with AutoNSubstituteCustomization: Set object count on ReadOnly IEnumerable property
            Asked 2022-Mar-15 at 13:48

            My test requires that I have different counts of objects in an IEnumerable property of the main entity collection. I have been searching for documentation about this but can't find anything. Here is a sample of what I mean (note that the base entity is created using AutoNSubstituteCustomization)

            ...

            ANSWER

            Answered 2022-Jan-21 at 17:31

            It seems that the issue you're having is not related to AutoFixture but rather with NSubstitute.

            Since ITransaction is an interface AutoFixture will delegate the task of creating and instance to the mocking library. In your case that's NSubstitute.

            Since your interface only declares getters but no setters, NSubstitute will generate a dynamic proxy, for your interface, that as will as well not have any public setters. This is why AutoFixture is unable to set the values of your properties.

            So if you want to continue using the mock, you'll have to either specify a public setter in your interface or tell AutoFixture how to set the values using the NSubstitute API. Unfortunately you'll be able to implement the second option only by implementing an ISpecimenBuilder factory for your interface and then play with reflection.

            Another way, which is what I recommend, is to relay the setup of your interface to a fake implementation, which you'll create by hand and which will have the public setters. Then you'll instruct AutoFixture to relay all requests to the interface to your fake class.

            Source https://stackoverflow.com/questions/70776061

            QUESTION

            Why am I getting 'Call to unconfigured method' when using wrapped functionality?
            Asked 2022-Mar-08 at 19:19

            Using version 7.3.0 of FakeItEasy. In following code I am getting message that call to method GetById is not configured, yet I am configuring it. What I am doing wrong? There is no overload for the GetById method.

            ...

            ANSWER

            Answered 2022-Mar-08 at 19:19

            Updated after getting new code and stack trace. Original answer left below

            I think it's a bug.

            Boring explanation:

            Strict and Wrapping each add rules to the front of the faked object's rules list. The rules apply to all incoming calls. The first rule found that matches a call is triggered. So in your configuration, Wrapping is added making the Fake attempt to forward all calls to the wrapped object. Then Strict, so now the Fake will reject all calls.

            You'd then expect

            Source https://stackoverflow.com/questions/71381196

            QUESTION

            Automapper and Nullable Reference Type raise "needs to have a constructor with 0 args or only optional args"
            Asked 2022-Mar-03 at 19:02
            Scenario

            I can't map a class with string and nullable reference type enabled

            ...

            ANSWER

            Answered 2022-Mar-03 at 19:02

            It is not related to the nullable reference types. Automapper is capable of mapping fields/properties to constructor parameters based on names and there is nothing to match author parameter so the original mapping fails. I.e. next will work:

            Source https://stackoverflow.com/questions/71342059

            QUESTION

            AutoFixture AutoMoq partially covers class constructor
            Asked 2022-Jan-26 at 08:09

            I am using AutoFixture AutoMoq and it's greatly simplifies the mock for all interface used in class and initialize it.

            Though I noticed the constructor code is partially covered, can we modify AutoMoqDataAttribute so that constructor ArgumentNullException can also be covered?

            ...

            ANSWER

            Answered 2022-Jan-26 at 08:09

            It is not the responsibility of the AutoDataAttribute to know how to cover your code. It is the developers responsibility to express intent and explicitly cover the scenario.

            In your case the uncovered branches are the null guards. Luckily AutoFixture provides a library just for that, AutoFixture.Idioms.

            This library provides idiomatic assertions, that encapsulate most basic test scenarios like null guards, property setters, equality members and so on.

            Using this library you can write a test like the following.

            Source https://stackoverflow.com/questions/70849199

            QUESTION

            Autofac.Extras.Moq - response from mocked Login does not contain expected value
            Asked 2021-Dec-29 at 14:51

            I want to make unit tests in my app. I use NUNIT, and the following libraries :

            • Autofac.Extras.Moq
            • AutoFixture

            I followed this samples but it doesn't work :

            Here is my test :

            ...

            ANSWER

            Answered 2021-Dec-29 at 14:51

            I found the solution, new LoginRequest(...) from my viewmodel and my tests are same BUT the hashcode (memory address) is different, so my test fail because my param is not the same object with the same memory than viewmodel

            here is my new test and my view model

            ViewModel

            Source https://stackoverflow.com/questions/70509232

            QUESTION

            Mocking a concrete class with a virtual method
            Asked 2021-Nov-10 at 02:49

            I want to test a class that depends on another class with the virtual method.

            ...

            ANSWER

            Answered 2021-Nov-10 at 00:23

            Because DepClass is neither an interface nor an abstract type, by default, AutoFixture will not rely on a mocking framework to create the instance, and will use the actual constructor from the type.

            Since NSubstitute does not have the equivalent of Mock or Fake from other popular mocking frameworks, AutoFixture had to provide a special specimen builder, called SubstituteRelay, to fill in the gap. You can use this class as any other specimen builder to instruct the Fixture to return a mock when a specific type instance is requested.

            Source https://stackoverflow.com/questions/69904268

            QUESTION

            Autofixure sublist example
            Asked 2021-Nov-03 at 08:34

            I have two class with one-to-many relationship

            ...

            ANSWER

            Answered 2021-Nov-02 at 11:13

            By default AutoFixture does not know how to correlate types, especially if there is no explicit relationship between them.

            The simplest solution would be to create the Author instance first and then using a builder set the AuthorId property.

            Source https://stackoverflow.com/questions/69787972

            QUESTION

            Why doesn't AutoFixture return injected services when the services are of type object (even though they have an actual type)?
            Asked 2021-Oct-01 at 07:06

            Due to the way that I'm trying to integrate AutoFixture with BUnit to run some Blazor tests, I need to create an IServiceProvider that will have an internal Fixture, and I can inject objects into that fixture to have those same objects returned when AutoFixture is request to create an object of that type.

            My IServiceProvider looks like this

            ...

            ANSWER

            Answered 2021-Oct-01 at 07:06

            The reason why Inject doesn't infer the type of the instance but rather relies on the generic parameter is because it needs to enable scenarios where it is necessary to register values for base types or interfaces fixture.Inject(instance).

            The way Inject works behind the scenes is that it delegates the registration to Register(Func creator) which then delegates it to a fixture.Customize(c => c.FromFactory(creator).OmitAutoProperties()). So you can see how it wouldn't work when you need type inference.

            You could as you said, make registrations one by one, or you could implement your own injection. Note the implementation below is a lighter implementation of the builder that would be normally generated by AutoFixture, and should cover most scenarios. If you find that some features are not working, like seeded requests, you might need a more complete implementation of the injection.

            Source https://stackoverflow.com/questions/69378259

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            AutoFixture uses FAKE as a build engine. If you would like to build the AutoFixture locally, run the build.cmd file and wait for the result.

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