Android的测试

一个简单的Android界面

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"   
    android:layout_height="match_parent"    
    android:paddingBottom="@dimen/activity_vertical_margin"   
    android:paddingLeft="@dimen/activity_horizontal_margin"  
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin"   
    tools:context="com.example.sam.a.MainActivity"    
    android:orientation="vertical">
 <TextView         android:layout_width="wrap_content"  
    android:layout_height="wrap_content"       
    android:text="Hello World!"        
    android:textSize="25dp"         
    android:id="@+id/textView"/>     
<EditText         android:layout_width="match_parent"     
    android:layout_height="wrap_content"       
    android:hint="Enter your name here"        
    android:id="@+id/editText"/>
<Button         android:layout_width="fill_parent"  
    android:layout_height="wrap_content"     
    android:text="SAY HELLO"        
    android:id="@+id/button"        
    android:layout_gravity="center_horizontal" />
</LinearLayout>

Java代码
package com.example.sam.a;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    @Override     protected void onCreate(Bundle savedInstanceState) {       
  super.onCreate(savedInstanceState);         
  setContentView(R.layout.activity_main);    
 }    
 public void sayHello(View view){   
    TextView textView=(TextView)findViewById(R.id.textView);     
    EditText editText=(EditText)findViewById(R.id.editText);  
    extView.setText("Hello,"+editText.getText().toString()+"!");
    } 
}


测试代码

public class MainActivityInstrumentation {  

   private static final String STRING_TO_BE_TYPED="Peter";

    @Rule   

  public ActivityTestRule<MainActivity>mActivityRule=new ActivityTestRule<>(MainActivity.class);  

   @Test   

  public void sayHello(){      

   onView(withId(

   R.id.editText)).perform(typeText(STRING_TO_BE_TYPED).closeSoftKeyboard());
        onView(withId(

   R.id.btn)).perform(click());      

   String expectedText="Hello,"+STRING_TO_BE_TYPED+"!";    

     onView(withId(

   R.id.textview)).check(matches(withText(expectedText)));   

   }

}