Android Espresso: 检查导航返回按钮是否不可见

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英文:

Android Espresso: check the navigate up button is not visible

问题

我在一个带有两个片段的活动中有以下工具栏:

Android Espresso: 检查导航返回按钮是否不可见

当我导航到第二个片段时,会显示一个向上按钮,但当返回时,它不再显示,这是正确的。
我只想用Espresso来断言它不在那里。为了断言它在那里,我使用了以下代码:

// 导航向上按钮应该显示为工具栏的子项
onView(allOf(instanceOf(AppCompatImageButton::class.java))).check(
    matches(
        ViewMatchers.withParent(
            withId(R.id.toolbar)
        )
    )
)

然而,我尝试否定它,并尝试以下方式来断言它不显示,但不起作用:

// 导航向上按钮不应该显示为工具栏的子项
onView(Matchers.anyOf(Matchers.instanceOf(AppCompatImageButton::class.java))).check(
    matches(
        Matchers.not(
            withParent(withId(R.id.toolbar))
        )
    )
)

有没有关于如何断言它以使其起作用的想法?

非常感谢!

英文:

I have the following toolbar in an Activity with two fragments:

Android Espresso: 检查导航返回按钮是否不可见

When I navigate to the second fragment, there is an up button showing, and when coming back, it isn't there, which is correct.
I just want to assert that it is NOT there with Espresso. To assert that it is there, I have used:

// The navigate up button should be displayed as a child of the toolbar
        onView(allOf(instanceOf(AppCompatImageButton::class.java))).check(
            matches(
                ViewMatchers.withParent(
                    withId(R.id.toolbar)
                )
            )
        )

However, I tried to negate it and do the following to assert that it isn't shown, but it doesn't work:

// The navigate up button should NOT be displayed as a child of the toolbar
        onView(Matchers.anyOf(Matchers.instanceOf(AppCompatImageButton::class.java))).check(
            matches(
                Matchers.not(
                    withParent(withId(R.id.toolbar))
                )
            )
        )

Any idea about how to assert it so that it works?

Thanks a lot in advance!

答案1

得分: 0

假设您的原始代码在按钮不存在时返回NoMatchingViewException,我会将其包装在try/catch中。我在下面简化了我的代码 - 您可能希望将其通用化并参数化以供重用。

private fun toolbarButtonExists(): Boolean {
    try {
        onView(allOf(instanceOf(AppCompatImageButton::class.java))).check(
            matches(
                ViewMatchers.withParent(
                    withId(R.id.toolbar)
                )
            )
        )
        return true
    } catch (e: NoMatchingViewException) {
        return false
    }
}

我还建议为该按钮分配一个id,因为您查找按钮的方式相当脆弱。通过id查找还可以让您使用doesNotExist()

英文:

Assuming your original code returns a NoMatchingViewException when the button doesn't exist, I'd wrap that in a try/catch. I'm simplifying my code below - you'd probably want to make this generic and parameterized for reuse.

private fun toolbarButtonExists(): Boolean {
    try {
        onView(allOf(instanceOf(AppCompatImageButton::class.java))).check(
            matches(
                ViewMatchers.withParent(
                    withId(R.id.toolbar)
                )
            )
        )
        return true
    } catch (e: NoMatchingViewException) {
        return false
    }
}

I'd also suggest getting an id assigned to that button because the way you're finding it is pretty brittle. Finding by id would also let you use doesNotExist().

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  • 本文由 发表于 2020年1月3日 20:41:43
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