Java中單元測試（Junit4和Mockito）和數據庫JDBC連接示例

首先添加依賴包：

保證倉庫爲jcenter()

buildscript {

    repositories {

        jcenter()

    }

    dependencies {

        classpath 'com.android.tools.build:gradle:2.3.3'

        // NOTE: Do not place your application dependencies here; they belong

        // in the individual module build.gradle files

    }

}

allprojects {

    repositories {

        jcenter()

    }

}

下載jar包：

dependencies {

    compile fileTree(dir: 'libs', include: ['*.jar'])

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {

        exclude group: 'com.android.support', module: 'support-annotations'

    })

    compile 'com.android.support:appcompat-v7:26.+'

    compile 'com.android.support:recyclerview-v7:26.+'

    compile 'com.android.support.constraint:constraint-layout:1.0.2'

    compile 'mysql:mysql-connector-java:5.+'

    testCompile 'junit:junit:4.12'

    testCompile 'org.mockito:mockito-all:2.+'

}

測試代碼：

package app.hwb.com.hiaiframework;

import org.junit.Before;

import org.junit.Test;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

import java.util.List;

import static org.junit.Assert.*;

import static org.mockito.Mockito.*;

/**

 * Example local unit test, which will execute on the development machine (host).

 *

 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>

 */

public class ExampleUnitTest {

    public List<String> mockedList;

    @Before

    public void Init(){

        mockedList = mock(List.class);

        System.out.println("in the Init");

    }

    @Test

    public void addition_isCorrect() throws Exception {

        //Junit單元測試

        assertEquals(4, 2 + 2);

        //創建mock對象，參數可以是類，也可以是接口

        //List<String> mockedList = mock(List.class);

        mockedList.add("one");

        //設置方法的預期返回值

        when(mockedList.get(0)).thenReturn("hhh");

        System.out.println(mockedList.size());

        verify(mockedList).size();//驗證方法調用（是否調用了size())

        mockedList.clear();

        try {

            Class.forName("com.mysql.jdbc.Driver");

        }catch (Exception e){

            e.printStackTrace();

        }

        String url = "jdbc:mysql://10.12.13.88:3306/mysql";

        Connection conn;

        try{

            conn = DriverManager.getConnection(url,"root","root");

            Statement stmt = conn.createStatement();

            System.out.println("Mysql數據庫連接成功！");

            String sql = "select * from user";

            ResultSet rs = stmt.executeQuery(sql);

            System.out.println("User"+"\t"+"Password");

            while (rs.next()){

                System.out.print(rs.getString(2) + "\t");

                System.out.print(rs.getString(3) + "\t");

                System.out.println();

            }

            rs.close();

            stmt.close();

            conn.close();

        }catch (Exception e){

            e.printStackTrace();

        }

    }

}

測試結果：

in the Init

0

Mysql數據庫連接成功！

User Password

root *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B

root *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B

Process finished with exit code 0