
《JUnit in Action》全新第3版封面截图
写在前面
本篇重点介绍容器内测试的专用框架------Arquillian。作者成书之时该框架还没能全面支持 JUnit 5,因此只能沿用 JUnit 4。最新消息据说已经实现了 JUnit 5 的兼容(待学完本书后验证)。Arquillian 框架貌似解了容器场景下的燃眉之急,但从这几年的爆冷也暴露了一些问题,让其团队尝到了热脸贴冷屁股的滋味......
(接上篇)
9.4 Arquillian 框架用法简介
Arquillian(https://arquillian.org/)是一款针对 Java 的测试框架。它利用了 JUnit 在 Java 容器中执行测试用例。
Arquillian 框架主要分为三个核心部分:
- 测试运行器(Test runners) :由
JUnit测试框架提供; - 容器(Containers) :如
WildFly、Tomcat、GlassFish、Jetty等; - 测试增强工具(Test enrichers) :负责将容器资源和各种
Bean直接注入到测试类中。
遗憾的是,该书出版五年后的今天,Arquillian 框架仍然没有与 JUnit 5 实现完美集成,相关演示只能在 JUnit 4 中进行。
Arquillian 框架使用 ShrinkWrap 这一外部依赖提供的流畅 API 接口完成归档文件的组装工作(如组装成 jar、war 和 ear 文件等),并在测试期间由 Arquillian 直接部署。
本节演示了一个航班与乘客管理的模拟场景,航班对象可以动态添加或删除乘客集合中的元素,并通过该航班的总座位数对乘客总数进行限制。航班中的乘客数据以 HashSet<Passenger> 的形式存在,并从一个 CSV 文件中完成初始化。具体情况如下。
首先添加所需的 Maven 依赖:
xml
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.jboss.arquillian</groupId>
<artifactId>arquillian-bom</artifactId>
<version>1.4.0.Final</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-7.0</artifactId>
<version>1.0.3.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
<version>5.9.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.junit</groupId>
<artifactId>arquillian-junit-container</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.container</groupId>
<artifactId>arquillian-weld-ee-embedded-1.1</artifactId>
<version>1.0.0.CR9</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.weld</groupId>
<artifactId>weld-core</artifactId>
<version>2.4.8.Final</version>
<scope>test</scope>
</dependency>
</dependencies>
注意 :由于本地实测距图书出版时相隔近五年,为了消除
IDEA提示的易遭攻击风险,JUnit版本最好升至5.9.2、weld-core的版本提升到2.4.8.Final。同时为了消除JDK11限制使用Java反射机制的警告,可以按照运行提示修改如下插件配置:
xml<plugins> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.2</version> <configuration> <argLine> --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.security=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED </argLine> </configuration> </plugin> </plugins>
Passenger 乘客实体类:
java
public class Passenger {
private String identifier;
private String name;
public Passenger(String identifier, String name) {
this.identifier = identifier;
this.name = name;
}
public String getIdentifier() {
return identifier;
}
public String getName() {
return name;
}
@Override
public String toString() {
return "Passenger " + getName() + " with identifier: " + getIdentifier();
}
}
Flight 航班实体类:
java
public class Flight {
private String flightNumber;
private int seats;
Set<Passenger> passengers = new HashSet<>();
public Flight(String flightNumber, int seats) {
this.flightNumber = flightNumber;
this.seats = seats;
}
public String getFlightNumber() {
return flightNumber;
}
public int getSeats() {
return seats;
}
public void setSeats(int seats) {
if (passengers.size() > seats) {
throw new RuntimeException("Cannot reduce seats under the number of existing passengers!");
}
this.seats = seats;
}
public int getNumberOfPassengers() {
return passengers.size();
}
public boolean addPassenger(Passenger passenger) {
if (passengers.size() >= seats) {
throw new RuntimeException("Cannot add more passengers than the capacity of the flight!");
}
return passengers.add(passenger);
}
public boolean removePassenger(Passenger passenger) {
return passengers.remove(passenger);
}
@Override
public String toString() {
return "Flight " + getFlightNumber();
}
}
乘客集合的初始化通过一个静态工具方法实现,需要从一个 CSV 文件 flights_information.csv 读取:
markdown
1236789; John Smith
9006789; Jane Underwood
1236790; James Perkins
9006790; Mary Calderon
1236791; Noah Graves
9006791; Jake Chavez
1236792; Oliver Aguilar
9006792; Emma McCann
1236793; Margaret Knight
9006793; Amelia Curry
1236794; Jack Vaughn
9006794; Liam Lewis
1236795; Olivia Reyes
9006795; Samantha Poole
1236796; Patricia Jordan
9006796; Robert Sherman
1236797; Mason Burton
9006797; Harry Christensen
1236798; Jennifer Mills
9006798; Sophia Graham
对应的工具类代码如下:
java
public class FlightBuilderUtil {
public static Flight buildFlightFromCsv() throws IOException {
Flight flight = new Flight("AA1234", 20);
try (BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/flights_information.csv"))) {
String line = null;
do {
line = reader.readLine();
if (line != null) {
String[] passengerString = line.toString().split(";");
Passenger passenger = new Passenger(passengerString[0].trim(), passengerString[1].trim());
flight.addPassenger(passenger);
}
} while (line != null);
}
return flight;
}
}
最终的 Arquillian 测试类如下:
java
@RunWith(Arquillian.class)
public class FlightWithPassengersTest {
@Deployment
public static JavaArchive createDeployment() {
return ShrinkWrap.create(JavaArchive.class)
.addClasses(Passenger.class, Flight.class, FlightProducer.class)
.addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml");
}
@Inject
Flight flight;
@Test(expected = RuntimeException.class)
public void testNumberOfSeatsCannotBeExceeded() throws IOException {
assertEquals(20, flight.getNumberOfPassengers());
flight.addPassenger(new Passenger("1247890", "Michael Johnson"));
}
@Test
public void testAddRemovePassengers() throws IOException {
flight.setSeats(21);
Passenger additionalPassenger = new Passenger("1247890", "Michael Johnson");
flight.addPassenger(additionalPassenger);
assertEquals(21, flight.getNumberOfPassengers());
flight.removePassenger(additionalPassenger);
assertEquals(20, flight.getNumberOfPassengers());
assertEquals(21, flight.getSeats());
}
}
上述代码中,相关组件的打包通过 @Deployment 注解的方法完成,具体由 ShrinkWrap 相关 API 实现。最初没有 FlightProducer.class 这个类(L7),但由于首次运行时 Arquillian 无法顺利注入 Flight 实例(仅支持无参构造函数):

因此需要利用 JavaEE 中的 CDI(Context & Dependency Injection)机制,手动注入 Flight 实例,通过新增一个带 @Produces 注解方法的普通工具类:
java
// FlightProducer.java
import javax.enterprise.inject.Produces;
public class FlightProducer {
@Produces
public Flight createFlight() throws IOException {
return FlightBuilderUtil.buildFlightFromCsv();
}
}
最后再将这个 FlightProducer 类一并打包到归档文件中即可(L4):
java
@Deployment
public static JavaArchive createDeployment() {
return ShrinkWrap.create(JavaArchive.class)
.addClasses(Passenger.class, Flight.class, FlightProducer.class)
.addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml");
}
最终实测截图:

后话
Arquillian官方文档貌似很长时间没有更新了,里面的一些示例还用的是Eclipse作展示,可见近年来并没有想象中的那么受欢迎。出发点很好、但好心办坏事的情况也比比皆是,本就不受重视的测试环节,为了贴近容器的真实环境还得搭一堆脚手架一样的东西,使用时又得改配置又得创建工具类,实在是不讨喜。因此本章只作为了解基本理念的拓展阅读即可,不必过于纠结。