Android:编写片段测试用例 [英] Android: Writing test cases for Fragments

问题描述

在我以前的项目中，我通过活动完成了大部分工作，并根据文档使用了ActivityInstrumentationTestCase2:
http://developer.android.com/tools/testing/activity_testing.html
我有一个如何使用活动测试用例的想法；但是当涉及到Fragment时，我没有太多的主意，也没有找到很多与此相关的文档. 那么，当我有几个片段具有一个或两个活动时，如何编写测试用例呢? 任何示例代码或示例都将更有帮助.

In my previous projects I've done most of the work through Activities and used ActivityInstrumentationTestCase2 as per the document:
http://developer.android.com/tools/testing/activity_testing.html
I have an idea how to work with Activity Test cases; but when it comes to Fragment ,I don't have much idea nor found much documents related to that. So how to write test cases when I have several fragments with one or two actvities? Any example code or sample would be more helpful.

推荐答案

AndroidX提供了一个库FragmentScenario，用于创建片段并更改其状态.

AndroidX provides a library, FragmentScenario, to create fragments and change their state.

app/build.gradle

dependencies {
    def fragment_version = "1.0.0"
    // ...
    debugImplementation 'androidx.fragment:fragment-testing:$fragment_version'
}

示例

@RunWith(AndroidJUnit4::class)
class MyTestSuite {
    @Test fun testEventFragment() {
        // The "fragmentArgs" and "factory" arguments are optional.
        val fragmentArgs = Bundle().apply {
            putInt("selectedListItem", 0)
        }
        val factory = MyFragmentFactory()
        val scenario = launchFragmentInContainer<MyFragment>(
                fragmentArgs, factory)
        onView(withId(R.id.text)).check(matches(withText("Hello World!")))
    }
}

有关官方文档的更多信息.

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