https://github.com/michaelbukachi/mockkcallback

A tutorial on testing Java 8 callbacks using kotlin
https://github.com/michaelbukachi/mockkcallback

android kotlin mocking mockk testing

Last synced: about 1 month ago
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A tutorial on testing Java 8 callbacks using kotlin

• Host: GitHub
• URL: https://github.com/michaelbukachi/mockkcallback
• Owner: michaelbukachi
• Created: 2018-07-25T07:17:28.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2018-07-31T05:19:54.000Z (almost 7 years ago)
• Last Synced: 2025-04-07T03:42:35.007Z (2 months ago)
• Topics: android, kotlin, mocking, mockk, testing
• Language: Kotlin
• Homepage:
• Size: 135 KB
• Stars: 3
• Watchers: 1
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Testing Asynchronous Callbacks in Kotlin

Code snippet:

```

class ConsumerTest {

    @MockK(relaxUnitFun = true) // In order to avoid the strict check by Mockk, a relaxed mock is required

    lateinit var task: BackgroundTask

    lateinit var consumer: Consumer

    lateinit var spyConsumer: Consumer

    val callbackSlot = slot()

    @Before

    fun setup() {

        MockKAnnotations.init(this)

        consumer = Consumer(task)

        spyConsumer = spyk(consumer, recordPrivateCalls = true)

    }

    @Test

    fun `test success`() {

        // Handle what happens when task.doBackground... is called

        // Capture callback and trigger it with the necessary data

        every { task.doBackground(capture(callbackSlot)) } answers {

            callbackSlot.captured.onDone(true, null)

        }

        spyConsumer.doBackgroundTask()

        verifyOrder {

            spyConsumer["printStarting"]()

            spyConsumer["printSuccess"]()

        }

    }

    @Test

    fun `test failure`() {

        every { task.doBackground(capture(callbackSlot)) } answers {

            callbackSlot.captured.onDone(false, null)

        }

        spyConsumer.doBackgroundTask()

        verifyOrder {

            spyConsumer["printStarting"]()

            spyConsumer["printFailed"]()

        }

    }

}

```