Question

在我的ViewModel中，我会得到下一个乐趣：

fun onTitleClick(titleName: Int) {
    when (titleName) {
        R.string.about_terms_service -> {
            termsOfServiceItemClickEvent.postValue(
                ViewModelEvent(
                    WebViewFragment.newBundle(
                        url = TERMS_LINK,
                        title = "Terms of Service"
                    )
                )
            )
        }
        R.string.about_open_source_licenses -> licenseItemClickEvent.postValue(ViewModelEvent(R.string.about_open_source_licenses))
    }
}

并具有下一个Event类：

open class ViewModelEvent<out T>(private val content: T? = null) {

    var hasBeenHandled = false
        private set

    /**
     * Returns the content and prevents its use again.
     */
    fun getContentIfNotHandled(): T? {
        return if (hasBeenHandled) {
            null
        } else {
            hasBeenHandled = true
            content
        }
    }

    /**
     * Returns the content, even if it's already been handled.
     */
    fun peekContent(): T? = content
}

在事件类中，我接下来有一些逻辑fun getContentIfNotHandled()。我怎样才能在Robolectric测试中测试这种逻辑？

这也是我的片段中的一些代码：

viewModel.licenseItemClickEvent.observe(this, Observer<ViewModelEvent<Int>> {
    it?.getContentIfNotHandled()?.let { activity?.addFragment(LicensesFragment()) }
})

Answer 1

解决下一个解决方案：

@RunWith(RobolectricTestRunner::class)
class ViewModelEventTest {

    @Test
    @Throws(Exception::class)
    fun getContentIfNotHandledTest() {
        val viewModelEvent = ViewModelEvent(5)

        assertFalse(viewModelEvent.hasBeenHandled)
        assertEquals(5, viewModelEvent.getContentIfNotHandled())
        assertTrue(viewModelEvent.hasBeenHandled)
        assertNull(viewModelEvent.getContentIfNotHandled())
    }
}

如何测试事件逻辑？

1 个答案: