Recently, a friend of mine asked me if there’s a better way to run integration tests without using in-memory DB because in-memory DB does not behave exactly like the real thing. In my opinion, the repository should be simple and not contain any business logic. Hence mocking the data in the in-memory DB for the … [Read more…]
I had to unit test a method that calls a service which returns an interface type. This returned interface is then serialised into JSON string and stored into to some database. This is an example of such method This is the example of the unit test I thought serialising any mock object to JSON should … [Read more…]
There are a couple ways to verify if 2 Json strings are equivalent. Using DeepEquals on JObject There’s a static function DeepEquals on JObject which compares the values of 2 tokens and all their descendant tokens. We can parse the Json strings into JObject and then use this function to compare them. Using FluentAssertions Another … [Read more…]
I have a generated WCF client with class similar to the sample below In my unit test, I instantiate an instance of SampleClass with a value of Cost field but without setting the CostFieldSpecified to true. When I serialise it to Json string, the Cost field’s value is 0 instead of the value I set … [Read more…]
This post I will show how to create a testing context which can be used in unit tests to automatically construct the testing target. My solution is based on this article from https://dotnetcoretutorials.com. I’ve customised it a bit to allow mock Target and automatically inject all the mocks during setup. The customisation will give you a mock … [Read more…]
Previously I showed how to mock SendAsync method in HttpClient so it can be unit tested. In this post, I will show how to mock the SendAsync method in DelegatingHandler so it can be unit tested as it allows you to mock the response and your test does not need to make a real Http request. The first problem … [Read more…]
Previously I showed how to log all HttpClient outgoing requests. I later added some logics for adding default headers in the SendAsync method in OutgoingHttpClient. I wanted to unit test this to make sure my logic is correct. I thought I could mock the HttpClient the normal way but since the SendAsync method in HttpClient is not virtual, I get … [Read more…]
I like using the Builder pattern for building test data in unit tests. Builder pattern makes it clean if I need to build a valid object, in the unit tests, with the minimum required properties. It also makes it clear when I need to build an object and explicitly specify a different value for any of … [Read more…]
So often we have to use DateTime.UtcNow or DateTime.Now in our code. To make it easier to mock current date time in unit test and to make unit tests more resilient, it’s better to not use DateTime.UtcNow or DateTime.Now directly but rather pass it in or make it as a property. Let’s say we have a … [Read more…]
It’s very common to use AutoMapper to map one object to another. However if not configured, unit testing functions that use AutoMapper will throw a missing mapping exception. I’ve seen in previous projects 2 different approaches developers use AutoMapper. I’m going to show how to configure AutoMapper in unit test for each of the approaches. … [Read more…]