android - 有没有办法使用 espresso 来测试 View 的大小(高度和宽度)以进行 android Instrumentation 测试？

Question

I want to check if the visibility and size of the adFrame changes after clicking the buttonShow

onView(withId(buttonShow)).perform(click());
onView(withId(adFrame)).check(matches(isDisplayed()));
onView(withId(adFrame)).check(?);

我正在寻找 的解决方案这个 ？ .

Do we have an assertion that can test the size of the adFrame using the espresso for this Android Instrumentation test?

Answer 1

给定以下匹配器:

class WidthMatcher(private val width: Int = ViewGroup.LayoutParams.MATCH_PARENT) : TypeSafeMatcher<View>() {
    companion object {
        fun withWidth(width: Int) = WidthMatcher(width)
    }

    override fun describeTo(description: Description?) {
        description?.appendText("View with width: ${width}px")
    }

    override fun matchesSafely(item: View): Boolean {
        return item.layoutParams?.width == width
    }
}

class HeightMatcher(private val height: Int = ViewGroup.LayoutParams.MATCH_PARENT) : TypeSafeMatcher<View>() {
    companion object {
        fun withHeight(height: Int) = HeightMatcher(height)
    }

    override fun describeTo(description: Description?) {
        description?.appendText("View with height: ${height}px")
    }

    override fun matchesSafely(item: View): Boolean {
        return item.layoutParams?.height == height
    }
}

你只需要检查如下:

onView(withId(adFrame)).check(matches(withHeight(ViewGroup.LayoutParams.MATCH_PARENT)))

您还可以检查以 px 为单位的任何大小。您可以使用以下方法将 dp 转换为 px:

/**
 * Converts dp unit to its equivalent in pixels, based on device density.
 *
 * @param dp The value in dp (density independent pixels) unit aim to convert into pixels
 * @return The equivalent int value in px of the provided dp value depending on device density
 */
fun dpToPx(dp: Int): Int {
    (dp * Resources.getSystem().displayMetrics.density).roundToInt()
}

/**
 * This method converts device specific pixels to density independent pixels.
 *
 * @param px A value in px (pixels) unit. Which we need to convert into db
 * @return The equivalent int value in dp of the provided px value depending on device density
 */
fun pxToDp(px: Int): Int {
    (px / Resources.getSystem().displayMetrics.density).roundToInt()
}