如何在Android Espresso上检查/测试Snackbar解雇

Question

我想测试一下Espresso是否知道如何检查Snackbar解雇？ 我目前正在删除标签并显示Snackbar让用户有机会撤消。 我删除标签后Snackbar.LEGNTH_LONG ，我想测试，如果我的标签之后仍然是名单上Snackbar.LEGNTH_LONG 。

我还没想出来。 Espresso有可能吗？

Answer 1

您可以将此类添加到项目中： https ： //android.googlesource.com/platform/frameworks/support/+/a1de3ee/design/tests/src/android/support/design/testutils/SnackbarUtils.java

它是一个包含此方法的utils类：

/**
 * Helper method that dismissed that specified {@link Snackbar} and waits until
 * it has been fully dismissed. Note that calling this method will reset the currently
 * set {@link Snackbar.Callback}.
 */
public static void dismissSnackbarAndWaitUntilFullyDismissed(Snackbar snackbar) {
    SnackbarDismissedCallback snackbarCallback = new SnackbarDismissedCallback();
    snackbar.setCallback(snackbarCallback);
    try {
        // Register our listener as idling resource so that Espresso waits until the
        // the snackbar has been fully dismissed
        Espresso.registerIdlingResources(snackbarCallback);
        // Dismiss the snackbar
        snackbar.dismiss();
        // Mark the callback to require waiting for idle state
        snackbarCallback.mNeedsIdle = true;
        // Perform a dummy Espresso action that loops until the UI thread is idle. This
        // effectively blocks us until the Snackbar has completed its sliding animation.
        onView(isRoot()).perform(waitUntilIdle());
        snackbarCallback.mNeedsIdle = false;
    } finally {
        // Unregister our idling resource
        Espresso.unregisterIdlingResources(snackbarCallback);
        // And remove our tracker listener from Snackbar
        snackbar.setCallback(null);
    }
}

然后执行：

SnackbarUtils.dismissSnackbarAndWaitUntilFullyDismissed(snackbar);

在您的测试中，检查您的标签是否仍在列表中。 我没有测试过这个，但我认为它应该可行。