Unit check — Argument Captor with Mockk | by Inder singh | Oct, 2022 | Excel Tech

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Testing is a vital a part of the software program improvement course of. A unit check typically workout routines the performance of the smallest doable unit of code (which could possibly be a technique or a category) in a repeatable manner. You need to add unit checks when you want to examine the logic of particular code in your utility.

The aim of this text is to clarify the usage of argument captor. If you wish to study the fundamentals of testing, there are some good tutorials accessible:

Observe: On this article, mannequin used for drills; the identical ideas can even apply to different simulation instruments.

Contemplate a operate that has a listener like getCurrentLocation within the essence beneath.

The unit check for getCurrentLocation operate wherein the situation returned efficiently (that’s, the addOnSuccessListener receives a name) is:

Let’s perceive the proof. at any time when getCurrentLocation will likely be known as, addOnSuccessListener should be invoked, to do this we’ve got to make use of argument captor.

ArgumentCaptor permits us to seize an argument handed to a technique to examine it. East it is particularly helpful after we cannot entry the argument exterior the strategy we would like to check.

There are two methods to seize arguments: utilizing CapturingSlot<TYPE> and utilizing MutableListOf<TYPE>.

CapturingSlot permits to seize just one worth, for our case this can work when you have a number of values ​​that you should utilize MutableListOf<TYPE>.

val slot = slot<OnSuccessListener<Location>>()each  locationTaskMock.addOnSuccessListener(seize(slot))solutions  slot.captured.onSuccess(locationTaskMock.consequence)                       locationTaskMock           

This creates a slot and a mock and set the anticipated conduct as follows: in case locationTaskMock.addOnSuccessListener known as, then OnSuccessListener is captured at slot locationTaskMock.consequence is answered.

val consequence =                currentLocationCoroutineWrapperImpl.getCurrentLocation(Precedence.PRIORITY_HIGH_ACCURACY)

Now, this operate will be simply asserted.

Let’s take one other instance the place a operate that takes a greater order operate as an argument like join(connectionListener: (isConnected: Boolean) -> Unit)

Unit check for the above operate join it’s:

.join(captureLambda<(isConnected: Boolean) -> Unit>())
lambda<(isConnected: Boolean) -> Unit>().captured.invoke(true)

Right here too, simply in case connectRemote.join known as then connectionListener: (isConnected: Boolean) -> Unit lambda is captured and true it’s returned.

after highOrderDemo.join will be acknowledged by way of

highOrderDemo.join  assertEquals(it, true) 

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Unit test — Argument Captor with Mockk | by Inder singh | Oct, 2022