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Unit testing methods that call methods with dependencies to the data access layer


Unit testing methods that call methods with dependencies to the data access layer

By : user3851423
Date : October 16 2020, 11:12 PM
wish help you to fix your issue You should mock the DB. That is, use an object that has the same interface, but does not access the DB. This object can either be hand written, or generated by a mock framework. The unit tests then queries the mock object to assert in was invoked as expected.
Then you have your class under test invoke an instance of the mock DB class, instead of the real DB object ; this technique is called dependency injection : you can either pass the mock object to the class under test, or rely on a Factory to return the correct class instance, depending on the code being unit tested or executed in production.
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Unit Testing the Data Access Layer - Testing Update Methods?

Unit Testing the Data Access Layer - Testing Update Methods?


By : niko
Date : March 29 2020, 07:55 AM
Does that help Test the method that reads the data from the database, first.
Then you can call the update function, and use the function that was tested above, to verify that the value that was updated is correct.
Unit testing the Data Access Layer in a 3-layer architecture

Unit testing the Data Access Layer in a 3-layer architecture


By : Yuri Kim
Date : March 29 2020, 07:55 AM
seems to work fine Mocking database stuff is notoriously hard, time-consuming and cumbersome. Therefore, a more practical approach would be to setup a test database, let your test run against it, and test the entire persistence thing in combination - this is not exactly unit testing, but far more practical...
Btw.: The typical 3-layer architecture is:
Unit testing methods that require several dependencies / other objects

Unit testing methods that require several dependencies / other objects


By : Cheyenne Lundgren
Date : March 29 2020, 07:55 AM
it helps some times Those question are usually hard to answer but I will try to give some tump roles that will help you decide
Unit test should be esay to understand what you are testing - should test 1 case at a test If your class need to have all your application and setting - you might have design issues. The simplest ways to overcome that are :better design , Interfaces, Injection If you depend on other 3rd party services - use mocking ,so you can control the response and test edge cases Depending on your platform - you can use Mockito or build your own mocking Something it's make sense that the test class inherit from you class - this way you can test non-public methods
Unit testing void methods w/ dependencies that change state with subsequent operation

Unit testing void methods w/ dependencies that change state with subsequent operation


By : Bo Qiao
Date : March 29 2020, 07:55 AM
it should still fix some issue Unless I misunderstand you, you are setting up the mergingObject as a mock, but you aren't setting up the behaviour of the mock. You need to tell the mocked mergingObject that when .merge is called, return something. That something can be anything you like, and you can verify that the returned object from process() is the same object.
you can set up the behaviour with the stubbing syntax in mockito. I've never used mockito but looking at the site it's something like this
How do I access methods in React for unit testing

How do I access methods in React for unit testing


By : Kusal Thilanka Sayan
Date : March 29 2020, 07:55 AM
wish of those help I don't know if you're aware, but Facebook wrote it's own testing library built upon Jasmine: https://facebook.github.io/jest
They have a tutorial for testing react here: https://facebook.github.io/jest/docs/tutorial-react.html
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