AutoFixture | open source library for .NET | Unit Testing library
kandi X-RAY | AutoFixture Summary
kandi X-RAY | AutoFixture Summary
(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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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of AutoFixture
AutoFixture Key Features
AutoFixture Examples and Code Snippets
Community Discussions
Trending Discussions on AutoFixture
QUESTION
I'm trying to create an AutoFixture.ISpecimenBuilder
for this class:
ANSWER
Answered 2022-Mar-25 at 12:02Activator.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:
QUESTION
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 09:00Whether 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
QUESTION
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 17:31It 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.
QUESTION
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 19:19Updated 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
QUESTION
I can't map a class with string
and nullable reference type enabled
ANSWER
Answered 2022-Mar-03 at 19:02It 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:
QUESTION
ANSWER
Answered 2022-Jan-26 at 08:09It 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.
QUESTION
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 :
- http://makanda.io/unit-testing-xamarin-forms-view-model/
- Mock a method of class under test with Moq & AutoMock
Here is my test :
...ANSWER
Answered 2021-Dec-29 at 14:51I 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
QUESTION
I want to test a class that depends on another class with the virtual method.
...ANSWER
Answered 2021-Nov-10 at 00:23Because 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.
QUESTION
I have two class with one-to-many relationship
...ANSWER
Answered 2021-Nov-02 at 11:13By 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.
QUESTION
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 07:06The 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.
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