Entity framework 6 mocking and unit testing frank decaire. The finished product is implemented as a selfcontained visual studio 2010 item template, available for download see bottom of article. Easy mock wrapper for mocking efcore2 dbcontext and dbset using moq or nsubstitute huysentruitwentityframeworkcoremock. If you want to learn unit testing in depth using mocking frameworks such as moq, fakeiteasy and typemock isolator, i highly recommend checking out the art of unit testing.
Now you can just start writing your unit tests without thinking about mocking dbcontext. Change connection at run time ef pending changes ef performance ef tutorial. We can start by creating an instance of the class were testing, along with a mock of an interface we want to use. Fake implementation of entity frameworks dbset for fast unit testing fakedbset. This library helps you with mocking entityframework contexts. For example we can assume that we have following production code. I want to mock my dbcontext so i can savechangesasync.
Im trying to use moq to make some tests for entity framework code first classes. To use the moq mocking framework in our application, we need to follow the below steps. This guidance and application demonstrate how to create unit tests for your web api 2 application that uses the entity framework. I am attempting to setup a callback to this function that will call another function to fire and forget. For testing with ef5 and earlier version see testing with a fake context. Moq provides a library that makes it simple to set up, test, and verify mocks. Mocking entity framework dbcontext with moq mirko maggioni. Using moq with entity framework 6 mocking include and where. I just opened the nuget window see tools library package manager manager nuget packages for solution, then i typed entity framework in the search online search box.
Sign up mock your entity framework contexts with ease. Net mvc model testing using nunit and moq dotnetcurry. With few interfaces, testing things that use it can be a real pain. However, there are a couple of gotchas i found out recently. If you find yourself in a situation where you need to mock a dbcontext and dbset with the moq framework, it is easy to do. Moq is the one and only mocking framework that allows specifying mock behavior via declarative specification queries. It allows interactions with dependencies to be simulated and verified in order to facilitate unit testing. I searched through the web for some solutions, but most are based on repository pattern, which i want to avoid. Entity framework mock db context that uses moq and idbset. Moq nsubstitute integration pm installpackage entityframeworkcore3mock.
Moq allowed me to mock out repositories and autofixture return a descent set of data from mocks. I modified it slightly for my purposes, and to also use an interface to decouple my dbcontext derived class, from my. There are few frameworks for creating mock objects. Im very new to moq and mocking techniques and i wonder if its possible to easily do a test that i will describe below. Mock entity framework database for the changes to the context template. Click here for more information about entity framework effort. Testing with a mocking framework ef6 microsoft docs. Maintenancefree mocking for unit testing with entity. Mocking an interface that inherits from ienumerable to return canned data is quite straightforward. The purpose of this blog post is to get you up and running writing your first unit tests with nunit and moq quickly. Two strategies for testing entity framework effort and. Net linq expression trees and lambda expressions, which makes it the most productive, typesafe and refactoringfriendly mocking library available. Moqhelper library to work with entity framework 6 and moq libraries doing.
In the project ive been working on, we use the framework moq for. Once you need some data in the database simply use entity framework to manipulate your data. Make sure you mark your dbsets as virtual moq requires this in order to create a mock of your class. Easy mock wrapper for mocking entityframeworkcore 3 efcore3 dbcontext and dbset in your unittests. Now you will be able to test methods that are using dbset from dbcontext in effective way. Lets assume the following simplified myentity, myentityrepository, and mydbcontext classes public class myentity public string name get. The scenario shown in this article is dependent on some changes we made to dbset in ef6. Testing with mock on entity framework 6 codeproject. Entity framework isnt unit test friendly, so how to mock entity frameworks dbcontext for unit testing.
Get it on nuget moq integration pm installpackage entityframeworkcore3mock. Net, entity framework, linq to sql, nhibernate moq savechanges. Autofixture and moq to test entity framework project. The following figure shows the arrangement of using mocking framework for unit testing. Net developed from scratch to take full advantage of. Easy mock wrapper for mocking entityframeworkcore efcore dbcontext and dbset using moq. Dbset, entity framework, linq, mock, moq, xunit 18 comments. How to mock data and write unit tests with entity framework. This library helps you mocking entityframework contexts. How to mock data entity framework entity framework.
Moq is the most popular and friendly mocking framework for. To demonstrate using ef with a mocking framework we are going to use moq. To mock a protected member you must first include the following at the top of your test fixture. How to mock an entity framework dbcontext and dbset with. The framework that i use for this purphose is moq and i can install it with nuget. My console application main program looks like this. How are people unit testing with entity framework 6, should you bother. Save time mocking use your real entity framework dbcontext in. While the situation will improve with the introduction of entity framework 7 and its inmemory data store, for now we still have to find a way of mocking dbcontext if we want to test code that uses it directly. Net is pretty nice when your dependency injectionioc is setup well, but entity framework 6 isnt the nicest framework for mocking and testing.
The extension allows you to achieve this by creating a context with behavior defined by your tests that makes use of inmemory data. Unit testing business logic that is based on entity framework is a difficult task. Extension for mocking entity framework core operations such tolistasync, firstordefaultasync etc. The easiest way to get moq is to install the moq package from nuget. Fake implementation of entity frameworks dbset for fast. Its likely that you use async methods of entity framework. In order to define the mock objects, we use generics passing the interface as the type. So you have an ienumerable list, array, etc that you want to use on your tests, but your. How to use moq with entity framework idbset count etc. Library that provides methods that will help you with mocking entity framework core.
An introduction to unit testing with mocks using moq. Extension for mocking entity framework core operations such tolistasync. For developers who practice unit testing and want to deliver exceptional software, justmock lite is the superior free mocking framework that makes unit testing simpler for solid testable projects. Therefore, i isolated my test from any dependency it had. Combination of autofixture and moq is just wonderful. We will see some of the common options for creating mock objects using the moq framework. There are other things you may need to do to get testing with moq to work with entity framework. How to mock entity frameworks dbcontext for unit testing. The behavior of the mock objects is done using basically a set of lambda expressions, making the code more productive and type safe see listing 4. Maintenancefree mocking for unit testing with entity framework 4. As you can see, now i am able to determine the behavior of my data layer by creating a mock object with a specific behavior. You then call protected on your mock, after which you can use the generic setup with the return type of your method.
Entity framework dbcontext looks simple to mock by great tools like moq. How do i go about unit testing with entity framework and moq. In our application, the departmentdataaccess class contains methods which makes call to the entityframework and hence to the database. Mocking dbcontext and dbset with moq michal jankowski. Do not worry about ids, keys, or virtual properties everything will work in exactly the same way as with entity framework and an ordinary database. The aim of unit testing is to test the business logic in isolation without dependencies on other components of the system.
Now you will be able to test methods that are using dbset or dbquery from dbcontext in an effective way installation nuget packages. Fake implementation of entity frameworks dbset for fast unit testing raw. To install as nuget package, run the following command in the package manager console. Easy mock wrapper for mocking ef6 dbcontext and dbset using moq or nsubstitute huysentruitwentity frameworkmock. This is an ideal scenario to make use of mock framework. Moq provides support for validating call order using mocksequence, however it only works when using strict mocks.
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