TestImageLoade.kt

@RunWith(AndroidJUnit4::class)
class TestImageLoader : AutoCloseKoinTest() {

    private val imageLoader: ImageLoader by inject()

    @Before
    fun before() {
        loadKoinModules(testModule)
    }

    @Test
    fun `image loader return a error`() {

        val imageView = mockk<ImageView>(relaxed = true)

        imageLoader.network {
            url { FAKE_IMAGE_URL }
            error { PLACE_HOLDER_ID }
            placeholder { PLACE_HOLDER_ID }
            errorCallback { {} }
            successCallback { { Assert.fail("The image loader must return an error") } }
        }.load(imageView)

        verify {
            imageView.setTag(
                ImageLoader.IMAGE_LOADER_TAG,
                ImageLoader.StateLoaded.LoadedFromNetwork(FAKE_IMAGE_URL, PLACE_HOLDER_ID, PLACE_HOLDER_ID, false)
            )
        }
    }

    @Test
    fun `image loader return a success`() {

        val imageView = mockk<ImageView>(relaxed = true)

        imageLoader.network {
            url { OK_IMAGE_URL }
            error { PLACE_HOLDER_ID }
            placeholder { PLACE_HOLDER_ID }
            errorCallback { { Assert.fail("The image loader must return an success ${it?.message}") } }
            successCallback { {} }
        }.load(imageView)

        verify {
            imageView.setTag(
                ImageLoader.IMAGE_LOADER_TAG,
                ImageLoader.StateLoaded.LoadedFromNetwork(OK_IMAGE_URL, PLACE_HOLDER_ID, PLACE_HOLDER_ID, true)
            )
        }
    }

    companion object {
        const val FAKE_IMAGE_URL = ""
        const val OK_IMAGE_URL = "https://teorico.net/images/test-dgt-1.png"
        const val PLACE_HOLDER_ID = R.drawable.ic_image_placeholder
    }


}