在ANDROID STUDIO环境下使用Espresso 测试框架进行UI测试

package com.example.test;

import android.support.test.filters.LargeTest;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;

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

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.closeSoftKeyboard;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

@RunWith(AndroidJUnit4.class)
@LargeTest
public class MainActivityInstrumentedTest {
    private static final String STRING_To_Be_TYPED = "him";
    //要写入的内容
    @Rule
    public ActivityTestRule<MainActivity> mainActivityTestRule = new ActivityTestRule<MainActivity>(MainActivity.class);

    @Test
    public void sayhello() {
        onView(withId(R.id.editText)).perform(typeText(STRING_To_Be_TYPED), closeSoftKeyboard());
        //获取editText的id,并将值写入
        onView(withText("say hello")).perform(click());
        //通过控件的文字定位按钮,并实现点击操作
        String expectedText = "Hello," + STRING_To_Be_TYPED + "!";
        //正确的输出内容
        onView(withId(R.id.textView)).check(matches(withText(expectedText)));
        //获取TextView的id,比对控件上的文字是否一致
    }
}