对dbunit进行mybatis DAO层Excel单元测试(必看篇)

DAO层测试难点

可重复性,每次运行单元测试,得到的数据是重复的

独立性,测试数据与实际数据相互独立

数据库中脏数据预处理

不能给数据库中数据带来变化

DAO层测试方法

使用内存数据库,如H2。优点:无需清空无关数据;缺点:单元测试中需要进行数据库初始化过程,如果初始化过程复杂,单元测试工作量增大

使用dbunit。优点:数据库初始化简单,大大减轻单元测试工作量;缺点:目前官方提供jar包只支持xml格式文件,需要自己开发Excel格式文件

基于dbunit进行DAO单元测试

应用环境:Spring、Mybatis、MySql、Excel

配置文件

1. pom.xml

引入jar包,unitils整合了dbunit,database,spring,io等模块

<dependency>
    <groupId>org.unitils</groupId>
    <artifactId>unitils-core</artifactId>
    <version>3.4.2</version>
  </dependency>
  <dependency>
    <groupId>org.unitils</groupId>
    <artifactId>unitils-dbunit</artifactId>
    <version>3.4.2</version>
  </dependency>
  <dependency>
    <groupId>org.unitils</groupId>
    <artifactId>unitils-io</artifactId>
    <version>3.4.2</version>
  </dependency>
  <dependency>
    <groupId>org.unitils</groupId>
    <artifactId>unitils-database</artifactId>
    <version>3.4.2</version>
  </dependency>
  <dependency>
    <groupId>org.unitils</groupId>
    <artifactId>unitils-spring</artifactId>
    <version>3.4.2</version>
  </dependency>
  <dependency>
    <groupId>org.dbunit</groupId>
    <artifactId>dbunit</artifactId>
    <version>2.5.3</version>
  </dependency>

配置maven对resourcew文件过滤规则,如果不过滤maven会对resource文件重编码,导致Excel文件被破坏

<resources>
    <resource>
      <directory>src/test/resources</directory>
      <includes>
        <include>**/*.*</include>
      </includes>
      <filtering>false</filtering>
    </resource>
  </resources>

2. unitils.properties

在测试源码根目录中创建一个项目级别的unitils.properties配置文件,主要用于配置自定义拓展模块,数据加载等相关信息

#启用unitils所需模块
unitils.modules=database,dbunit

#自定义扩展模块,加载Excel文件,默认拓展模块org.unitils.dbunit.DbUnitModule支持xml
unitils.module.dbunit.className=org.agoura.myunit.module.MyDbUnitModule

#配置数据库连接
database.driverClassName=com.mysql.jdbc.Driver
database.url=jdbc:mysql://127.0.0.1:3306/teams?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf-8
database.userName=root
database.password=agoura
#配置为数据库名称
database.schemaNames=teams
#配置数据库方言
database.dialect=mysql

#需设置false,否则我们的测试函数只有在执行完函数体后,才将数据插入的数据表中
unitils.module.database.runAfter=false

#配置数据库维护策略.请注意下面这段描述
# If set to true, the DBMaintainer will be used to update the unit test database schema. This is done once for each
# test run, when creating the DataSource that provides access to the unit test database.
updateDataBaseSchema.enabled=true

#配置数据库表创建策略,是否自动建表以及建表sql脚本存放目录
dbMaintainer.autoCreateExecutedScriptsTable=true
dbMaintainer.keepRetryingAfterError.enabled=true
dbMaintainer.script.locations=src/main/resources/dbscripts
#dbMaintainer.script.fileExtensions=sql

#数据集加载策略
#CleanInsertLoadStrategy:先删除dateSet中有关表的数据,然后再插入数据
#InsertLoadStrategy:只插入数据
#RefreshLoadStrategy:有同样key的数据更新,没有的插入
#UpdateLoadStrategy:有同样key的数据更新,没有的不做任何操作
DbUnitModule.DataSet.loadStrategy.default=org.unitils.dbunit.datasetloadstrategy.impl.CleanInsertLoadStrategy

#配置数据集工厂,自定义
DbUnitModule.DataSet.factory.default=org.agoura.myunit.utils.MultiSchemaXlsDataSetFactory
DbUnitModule.ExpectedDataSet.factory.default=org.agoura.myunit.utils.MultiSchemaXlsDataSetFactory

#配置事务策略 commit、rollback 和disabled;或者在代码的方法上标记@Transactional(value=TransactionMode.ROLLBACK)
#commit 是单元测试方法过后提交事务
#rollback 是回滚事务
#disabled 是没有事务,默认情况下,事务管理是disabled
DatabaseModule.Transactional.value.default=commit

#配置数据集结构模式XSD生成路径,可以自定义目录,但不能为空
dataSetStructureGenerator.xsd.dirName=src/main/resources/xsd
dbMaintainer.generateDataSetStructure.enabled=true

#文件相对路径是否是测试类文件路径,false表示resource根目录
dbUnit.datasetresolver.prefixWithPackageName=false

3. spring-mybatis-unitils.xml

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.1.xsd">

  <context:component-scan base-package="com.agoura.agoura"/>

  <context:property-placeholder location="classpath:jdbc_dbcp.properties"/>
  <!--<util:properties id="jdbc_dbcp" />-->

  <bean id="dataSource" class="org.unitils.database.UnitilsDataSourceFactoryBean"/>

  <!-- spring和MyBatis整合,不需要mybatis的配置映射文件 -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!-- 自动扫描mapping.xml文件 -->
    <property name="mapperLocations" value="classpath*:com/agoura/agoura/mapper/xml/*.xml"></property>
  </bean>

  <!-- DAO接口所在包名,Spring会自动查找其下的类 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.agoura.agoura.mapper"/>
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
  </bean>

  <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
  <bean id="transactionManager"
     class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
  </bean>
</beans>

dbunit执行流程

dbunit通过@DataSet注解读取模拟数据Excel文件,流程如下:

Excel文件 --> @DataSet --> DbUnitModule --> DataSetFactory --> 数据库(MySql)

@DataSet:将指定路径下Excel文件加载到DbUnitModule中

DbUnitModule:对传入文件进行预处理,源代码中对传入的xml文件copy一份临时文件,并将临时文件交给DataSetFactory处理,处理完后再删除临时文件

DataSetFactory:将读取的Excel数据转换为MultiSchemaDataSet,准备放入数据库中

由于原代码DbUnitModule中只有对xml文件的预处理,而我们是要对Excel文件进行预处理,所以需要对DbUnitModule进行重写。重写内容为:完善DbUnitDatabaseConnection连接;针对Excel文件,修改预处理实现;修改文件处理后续操作。示例如下:

import org.dbunit.database.DatabaseConfig;
import org.dbunit.ext.mysql.MySqlDataTypeFactory;
import org.dbunit.ext.mysql.MySqlMetadataHandler;
import org.unitils.core.UnitilsException;
import org.unitils.dbmaintainer.locator.ClassPathDataLocator;
import org.unitils.dbmaintainer.locator.resourcepickingstrategie.ResourcePickingStrategie;
import org.unitils.dbunit.DbUnitModule;
import org.unitils.dbunit.datasetfactory.DataSetFactory;
import org.unitils.dbunit.util.DbUnitDatabaseConnection;
import org.unitils.dbunit.util.MultiSchemaDataSet;

import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class MyDbUnitModule extends DbUnitModule {

  //完善DbUnitDatabaseConnection连接信息
  @Override
  public DbUnitDatabaseConnection getDbUnitDatabaseConnection(final String schemaName) {
    DbUnitDatabaseConnection result = dbUnitDatabaseConnections.get(schemaName);
    if (result != null) {
      return result;
    }

    result = super.getDbUnitDatabaseConnection(schemaName);

    result.getConfig().setProperty(DatabaseConfig.PROPERTY_DATATYPE_FACTORY, new MySqlDataTypeFactory());
    result.getConfig().setProperty(DatabaseConfig.PROPERTY_METADATA_HANDLER, new MySqlMetadataHandler());
    return result;
  }

  //Excel预处理操作,将@DataSet注释读取的文件返回给DataSetFactory进行处理
  @Override
  protected File handleDataSetResource(ClassPathDataLocator locator, String nameResource, ResourcePickingStrategie strategy, Class<?> testClass) {
    String cloneResource = new String(nameResource);
    String packageName = testClass.getPackage() != null?testClass.getPackage().getName():"";
    String tempName = "";
    if(cloneResource.startsWith(packageName.replace(".", "/"))) {
      cloneResource = tempName = cloneResource.substring(packageName.length());
    } else if(cloneResource.startsWith(packageName)) {
      cloneResource = tempName = cloneResource.substring(packageName.length() + 1);
    } else {
      tempName = cloneResource;
    }

    InputStream in = locator.getDataResource(packageName.replace(".", "/") + "/" + tempName, strategy);
    File resolvedFile = null;
    if(in == null) {
      resolvedFile = this.getDataSetResolver().resolve(testClass, cloneResource);
      if(resolvedFile == null) {
        throw new UnitilsException("DataSetResource file with name '" + nameResource + "' cannot be found");
      }
    }

    return resolvedFile;
  }

  //调用DataSetFactory.createDataSet()向数据库中注入Excel数据后,直接返回DataSet,不对DataSet执行清零操作
  @Override
  protected MultiSchemaDataSet getDataSet(Class<?> testClass, String[] dataSetFileNames, DataSetFactory dataSetFactory) {
    List<File> dataSetFiles = new ArrayList<File>();

    ResourcePickingStrategie resourcePickingStrategie = getResourcePickingStrategie();

    for (String dataSetFileName : dataSetFileNames) {
      File dataSetFile = handleDataSetResource(new ClassPathDataLocator(), dataSetFileName, resourcePickingStrategie, testClass);
      dataSetFiles.add(dataSetFile);
    }

    MultiSchemaDataSet dataSet = dataSetFactory.createDataSet(dataSetFiles.toArray(new File[dataSetFiles.size()]));
    return dataSet;
  }
}

拓展模块DbUnitModule重写完后,由于官方版本中DataSetFactory只对xml文件进行处理,为了能处理Excel文件,需要对DataSetFactory进行重写。示例如下:

import org.unitils.core.UnitilsException;
import org.unitils.dbunit.datasetfactory.DataSetFactory;
import org.unitils.dbunit.util.MultiSchemaDataSet;

import java.io.File;
import java.util.*;

public class MultiSchemaXlsDataSetFactory implements DataSetFactory {
  protected String defaultSchemaName;

  public void init(Properties configuration, String s) {
    this.defaultSchemaName = s;
  }

  public MultiSchemaDataSet createDataSet(File... dataSetFiles) {
    try {
      MultiSchemaXlsDataSetReader xlsDataSetReader = new MultiSchemaXlsDataSetReader(defaultSchemaName);
      return xlsDataSetReader.readDataSetXls(dataSetFiles);
    } catch (Exception e) {
      throw new UnitilsException("创建数据集失败:" + Arrays.toString(dataSetFiles), e);
    }
  }

  public String getDataSetFileExtension() {
    return "xls";
  }
}

createDataSet()为自定义的数据集工厂MultiSchemaXlsDataSetFactory中的核心方法,主要是读取传入的Excel文件,将读取数据写入MutiSchemaXlsDataSet中。MultiSchemaXlsDataSetReader通过POI实现了读取Excel数据功能,可以同时读取多个数据集,也即多个模拟数据库数据。

import org.dbunit.database.AmbiguousTableNameException;
import org.dbunit.dataset.DefaultDataSet;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.excel.XlsDataSet;
import org.unitils.core.UnitilsException;
import org.unitils.dbunit.util.MultiSchemaDataSet;

import java.io.File;
import java.io.FileInputStream;
import java.util.*;

public class MultiSchemaXlsDataSetReader {
  private String pattern = ".";
  private String defaultSchemaName;

  public MultiSchemaXlsDataSetReader(String defaultSchemaName) {
    this.defaultSchemaName = defaultSchemaName;
  }

  public MultiSchemaDataSet readDataSetXls(File... dataSetFiles) {
    try {
      Map<String, List<ITable>> tbMap = getTables(dataSetFiles);
      MultiSchemaDataSet dataSets = new MultiSchemaDataSet();

      for (Map.Entry<String, List<ITable>> entry : tbMap.entrySet()) {
        List<ITable> tables = entry.getValue();
        try {
          DefaultDataSet ds = new DefaultDataSet(tables.toArray(new ITable[]{}));
          dataSets.setDataSetForSchema(entry.getKey(), ds);
        } catch (AmbiguousTableNameException e) {
          throw new UnitilsException("构造DataSet失败!", e);
        }
      }
      return dataSets;
    } catch (Exception e) {
      throw new UnitilsException("解析Excel文件出错:", e);
    }
  }

  private Map<String, List<ITable>> getTables(File... dataSetFiles) {
    Map<String, List<ITable>> tableMap = new HashMap<>();
    // 需要根据schema把Table重新组合一下
    try {
      String schema, tableName;
      for (File file : dataSetFiles) {
        IDataSet dataSet = new XlsDataSet(new FileInputStream(file));
        String[] tableNames = dataSet.getTableNames();
        for (String tn : tableNames) {
          String[] temp = tn.split(pattern);
          if (temp.length == 2) {
            schema = temp[0];
            tableName = temp[1];
          } else {
            schema = this.defaultSchemaName;
            tableName = tn;
          }

          ITable table = dataSet.getTable(tn);
          if (!tableMap.containsKey(schema)) {
            tableMap.put(schema, new ArrayList<ITable>());
          }
          tableMap.get(schema).add(new XslTableWrapper(tableName, table));
        }
      }
    } catch (Exception e) {
      throw new UnitilsException("Unable to create DbUnit dataset for data set files: " + Arrays.toString(dataSetFiles), e);
    }
    return tableMap;
  }
}

到此,unitils重写及配置完毕,下面进行测试。

测试示例

被测试DAO层代码:

public interface MembersMapper {
  int deleteByPrimaryKey(Integer id);

  int insert(Members record);

  Members selectByPrimaryKey(Integer id);

  int updateByPrimaryKey(Members record);
}

测试类文件:

import com.agoura.entity.Members;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.unitils.UnitilsJUnit4;
import org.unitils.UnitilsJUnit4TestClassRunner;
import org.unitils.dbunit.annotation.DataSet;

import static org.junit.Assert.assertNotNull;

@RunWith(UnitilsJUnit4TestClassRunner.class)
@ContextConfiguration(locations = {"classpath*:spring-*.xml"})
public class MembersMapperTest extends UnitilsJUnit4 {

  private MembersMapper membersMapper;
  private static ApplicationContext ctx;

  @BeforeClass
  public static void setUpBeforeClass() {
    ctx = new ClassPathXmlApplicationContext("classpath*:spring-mybatis-unitils.xml");
  }

  @Before
  public void setUp() {
    membersMapper = (MembersMapper) ctx.getBean("membersMapper");
  }

  @Test
  @DataSet(value = {"test.xls"})   //test.xlsx
  public void testSelectByPrimaryKey() throws Exception {
    Members member = membersMapper.selectByPrimaryKey(3);
    System.out.println(member);
    assertEquals("王五", member.getName());
  }
}

@DataSet加载Excel文件,既可以加载 .xls文件,也可以加载 .xlsx文件。

.xls示例如下:

应数据库表名,字段必须和数据库表字段一一对应。

测试结果

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