如何使用 Android Espresso 测试 TextInputLayout 值（提示、错误等）？

Question

如果我的TextInputLayout视图有特定提示，我正在尝试使用 Espresso 进行测试。 我使用了如下代码：

Espresso.onView(ViewMatchers.withId(R.id.edit_text_email))
    .check(ViewAssertions.matches(
        ViewMatchers.withHint(R.string.edit_text_email_hint)))

这适用于普通EditText视图，而不是包含在TextInputLayout 。 但是，当它环绕时，它不再起作用。

我尝试使用Android Espresso 中的解决方案- 如何检查 EditText 提示？ ，但它仍然不起作用。

我还调查了： https : //code.google.com/p/android/issues/detail? withHint报告了这个问题，它说通过指向当前的withHint代码，解决方法很容易，但我不能让它工作。

任何想法来解决这个问题？

Answer 1

这是我的自定义匹配器：

public static Matcher<View> hasTextInputLayoutHintText(final String expectedErrorText) {
        return new TypeSafeMatcher<View>() {

            @Override
            public boolean matchesSafely(View view) {
                if (!(view instanceof TextInputLayout)) {
                    return false;
                }

                CharSequence error = ((TextInputLayout) view).getHint();

                if (error == null) {
                    return false;
                }

                String hint = error.toString();

                return expectedErrorText.equals(hint);
            }

            @Override
            public void describeTo(Description description) {
            }
        };
    }
}

以下是使用方法：

@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

    @Rule
    public ActivityTestRule<MainActivity> mRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void testMyApp() {
        onView(withId(R.id.textInputLayout)).check
                (matches(hasTextInputLayoutErrorText(mRule.getActivity().getString(R.string
                        .app_name))));

    }

如果您想检查TextInputLayout errorText ，请更改此行：

     CharSequence error = ((TextInputLayout) view).getHint();

与

     CharSequence error = ((TextInputLayout) view).getError();

希望它会有所帮助

Answer 2

kotlin 版本的 piotrek1543 的回答：

fun hasTextInputLayoutHintText(expectedErrorText: String): Matcher<View> = object : TypeSafeMatcher<View>() {

    override fun describeTo(description: Description?) { }

    override fun matchesSafely(item: View?): Boolean {
        if (item !is TextInputLayout) return false
        val error = item.hint ?: return false
        val hint = error.toString()
        return expectedErrorText == hint
    }
}

Answer 3

更通用的解决方案，适用于任何具有“getHint”方法的视图：

public static Matcher<View> withCustomHint(final Matcher<String> stringMatcher) {
    return new BaseMatcher<View>() {
        @Override
        public void describeTo(Description description) {
        }

        @Override
        public boolean matches(Object item) {
            try {
                Method method = item.getClass().getMethod("getHint");
                return stringMatcher.matches(method.invoke(item));
            } catch (NoSuchMethodException e) {
            } catch (InvocationTargetException e) {
            } catch (IllegalAccessException e) {
            }
            return false;
        }
    };
}

用法：

onView(withId(R.id.SomeLayout)).check(matches(withCustomHint(is("SomeString"))));

Answer 4

你有两个解决方案

-第一

    onView(withText(errorMessage)).check(matches(isDisplayed()))

-秒

    onView(withId(R.id.textinput_error)).check(matches(withText(errorMessage)))

Answer 5

一个更简单的解决方案是检查错误文本是否可见，例如：

val text = mTestRule.getActivity().getString(R.string.error_text)
onView(withText(text)).check(matches(isDisplayed()))

Answer 6

可以避免 Java 反射。 此外，TextView 及其所有后代（包括 TextInputEditText）或 TextInputLayout 都支持提示。 因此

fun withHint(expected: String) = object : TypeSafeMatcher<View>() {
    override fun describeTo(description: Description) {
        description.appendText("TextView or TextInputLayout with hint '$expected'")
    }

    override fun matchesSafely(item: View?) =
        item is TextInputLayout && expected == item.hint || item is TextView && expected == item.hint
}

并且可以这样使用：

onView(withId(R.id.exampleView)).check(matches(withHint("example text")))

Answer 7

一些 adobe 解决方案是正确的，但我想添加一个我认为比其他解决方案更简单的 kotlin 版本：

fun hasNoErrorText() = object : TypeSafeMatcher<View>() {
    override fun describeTo(description: Description) {
        description.appendText("has no error text ")
    }

    override fun matchesSafely(view: View?) = view is TextInputLayout && view.error == null
}

Answer 8

上面的解决方案不适用于我的用例。 我想找到 TextInputEditText 并在其中输入文本。 这是我的解决方案：

    @VisibleForTesting
class WithTextInputLayoutHintMatcher @RemoteMsgConstructor
constructor(@field:RemoteMsgField(order = 0)
            private val stringMatcher: Matcher<String>) : TypeSafeMatcher<View>() {

    override fun describeTo(description: Description) {
        description.appendText("with TextInputLayout hint: ")
        stringMatcher.describeTo(description)
    }

    public override fun matchesSafely(textInputEditText: View): Boolean {
        if (textInputEditText !is TextInputEditText) return false

        return stringMatcher.matches((textInputEditText.parent.parent as? TextInputLayout)?.hint)
    }
}

/**
 * Returns a matcher that matches [TextInputEditText] based on it's hint property value.
 *
 *
 * **Note:** View's sugar for `withHint(is("string"))`.
 *
 * @param hintText [String] with the hint text to match
 */
fun withTextInputHint(hintText: String): Matcher<View> {
    return withTextInputHint(Matchers.`is`(checkNotNull(hintText)))
}

/**
 * Returns a matcher that matches a descendant of [TextInputEditText] that is displaying the hint
 * associated with the given resource id.
 *
 * @param resourceId the string resource the text view is expected to have as a hint.
 */
fun withTextInputHint(resourceId: Int): Matcher<View> {
    return withTextInputHint(getString(resourceId))
}

/**
 * Returns a matcher that matches [TextView]s based on hint property value.
 *
 *
 * **Note:** View's hint property can be `null`, to match against it use `
 * withHint(nullValue(String.class)`
 *
 * @param stringMatcher [`Matcher
`](http://hamcrest.org/JavaHamcrest/javadoc/1.3/org/hamcrest/Matcher.html) *  of [String] with text to match
 */
fun withTextInputHint(stringMatcher: Matcher<String>): Matcher<View> {
    return WithTextInputLayoutHintMatcher(checkNotNull(stringMatcher))
}

用法：

onView(withTextInputHint(R.string.hint)).perform(ViewActions.typeText("Type text here"))

Answer 9

使用BoundedMatcher您可以摆脱类型检查：

fun withHint(@StringRes hintId: Int?) =
    object : BoundedMatcher<View, TextInputLayout>(TextInputLayout::class.java) {

        override fun matchesSafely(item: TextInputLayout?): Boolean =
            when {
                item == null -> false
                hintId == null -> item.hint == null
                else -> item.hint?.toString() == item.context.getString(hintId)
            }

        override fun describeTo(description: Description?) {
            description?.appendText("with hint id $hintId")
        }
    }

Answer 10

如果您尝试检查 Material TextInputLayout 中的错误，请尝试以下操作：

onView(withId(viewId)).check(matches(textInputLayoutErrorTextMatcher(getString(stringId))))

确保提供 TextInputLayout 的 id 而不是它的子元素（即 TextInputEditText）。