Espresso how to test按钮在输入9位数字后才会启用

import androidx.test.espresso.Espresso;
import androidx.test.espresso.matcher.ViewMatchers;
import androidx.test.ext.junit.rules.ActivityScenarioRule;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.LargeTest;

import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static androidx.test.espresso.action.ViewActions.*;
import static androidx.test.espresso.assertion.ViewAssertions.*;
import static androidx.test.espresso.matcher.ViewMatchers.*;

@RunWith(AndroidJUnit4.class)
@LargeTest
public class EspressoTest {

    @Rule
    public ActivityScenarioRule<MainActivity> activityScenarioRule = new ActivityScenarioRule<>(MainActivity.class);

    @Test
    public void testEnableButtonAfterEnteringNineDigits() {
        // 找到输入框并输入9位数字
        Espresso.onView(ViewMatchers.withId(R.id.editText))
                .perform(typeText("123456789"), closeSoftKeyboard());

        // 找到按钮并验证它是否启用
        Espresso.onView(ViewMatchers.withId(R.id.button))
                .check(matches(isEnabled()));
    }
}