单元测试

1、首先是配置环境（如果 targetSdkVersion为 24或 targetSdkVersion为 23）

放在app下的build.gradle里的defaultConfig {}中

//add for test
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

在build.gradle里的dependencies {}中

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//add for test
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
}
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如果本身配置高，会自动的配置测试环境

2、xml布局
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<EditText

android:hint="Enter your name here"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editText"
android:layout_alignBaseline="@+id/button"
android:layout_alignBottom="@+id/button"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />

<Button

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Say Hello"
android:id="@+id/button"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="51dp" />

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3、MainActivity
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package com.example.lenovo.myapplication1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView textView;

private EditText editText;

private Button button;



@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    textView= (TextView) findViewById(R.id.textView);

    editText= (EditText) findViewById(R.id.editText);

    button= (Button) findViewById(R.id.button);



    button.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View view) {

            editText.setText(textView.getText().toString());

        }

    });

}

}
4、测试程序

private static final String STRING_TO_BE_TYPED = "Peter";

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package com.example.lenovo.myapplication1;

import org.junit.Rule;
import org.junit.Test;

/**

• Created by lenovo on 2017-3-16.
  */
  @Rule
  public ActivityTestRule mActivityRule = new ActivityTestRule<>(MainActivity.class);

@Test
public void sayHello() {
onView(withId(R.id.editText))
.perform(typeText(STRING_TO_BE_TYPED),
closeSoftKeyboard());

    onView(withText("Say hello!")).perform(click());

    String expectedText = "Hello," + STRING_TO_BE_TYPED + "!";
    onView(withId(R.id.textView))
   .check(matches(withText(expectedText)));
    }