Android Espresso. How to check ErrorText in TextInputLayout

Question

Basically I am trying to test that after login incorrectly I have an error showing in the email field.

The view is:

Answer 1

Its working :)

onView(withId(R.id.et_email)).check(matches(hasErrorText("Error Message")));

Answer 2

Please use setError() method of EditText Ex : EditText emailEditText;

if(invalidLogin)
    emailEditText.setError("Error Message");

Answer 3

You could write a Custom Matcher:

public final class CustomItemMatchers {

private static class TextInputLayoutErrorMatcher extends BoundedMatcher<Object, Wrapper> {

  private final Matcher<String> itemTextMatcher;

  public TextInputLayoutErrorMatcher(final Matcher<String> itemTextMatcher){
     super(TextInputLayout.class);
     this.itemTextMatcher = itemTextMatcher;
  }

  @Override
  public void describeTo(Description description) {
     description.appendText("with error  content: ");
     itemTextMatcher.describeTo(description);
  }

  @Override
  protected boolean matchesSafely(TextInputLayout til) {
     if (til == null) {
        return false;
     }
     return itemTextMatcher.matches((til.getError());
  }
}

public static Matcher<Object> withErrorName(final Matcher<String> itemTextMatcher) {
  checkNotNull(itemTextMatcher);
  return new TextInputLayoutErrorMatcher(itemTextMatcher);
}
}

You can use it then with

matches(CustomItemMatchers.withErrorName(equalTo("My Error")))

This code was written with Espresso 1, but I hope it still works.

Answer 4

wrote a custom matcher

import android.view.View;

import com.google.android.material.textfield.TextInputLayout;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

public class TextInputLayoutErrorMatcher extends TypeSafeMatcher<View>{

private String expectedErrorText;

TextInputLayoutErrorMatcher(String expectedErrorText) {
    this.expectedErrorText = expectedErrorText;
}

@Override
protected boolean matchesSafely(View item) {

    if (!(item instanceof TextInputLayout)) {
        return false;
    }

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

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

    String hint = error.toString();

    return expectedErrorText.equals(hint);
}

@Override
public void describeTo(Description description) {
    description.appendText("with error text " + expectedErrorText);
}

}

Answer 5

This works with a CustomMatcher:

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

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

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

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

            String hint = error.toString();

            return expectedErrorText.equals(hint);
        }

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

Answer 6

I think that you would like to set error on TextInputLayout not on EditText. If it is correct, in the following way you could achieve this.

 onView(withId(R.id.ti_email)).check(matches(hasDescendant(
    withText(ctx.getString(R.string.authentication_error_empty_email))))
 )