如何在JUnit测试之间共享状态? [英] How do I share state between JUnit tests?

问题描述

我有一个扩展了junit.framework.TestCase的测试类，其中有几种测试方法.每个方法都打开与服务器的HTTP连接并交换请求和响应json字符串.一个方法使用名为UID(类似于sessionId)的字符串获取响应，我需要在对服务器的后续请求中使用.

我以前是将该字符串写入文件，下一个请求是读取该文件中的字符串.我一次运行一个方法.现在，我试图不使用文件操作就使用该字符串.我维护了一个hastable(因为在那里为此，在我的测试类中有很多要作为实例变量进行跟踪的UID，但最终发现每次执行静态块时，每次调用方法时都会为我的类加载该类，这导致这些UID丢失. /p>

如何在不写入文件和不读取文件的情况下实现这一目标?

我怀疑标题是否符合我的要求.请相应地对其进行编辑.

解决方案

为此您将需要一个静态变量，因为每个测试都具有自己的测试类实例.

使用此模式:

private static String uuid;

private void login() {
    // Run this only once
    if (null != uuid) return;

    ... talk to your server ...
    uuid = responseFromServer.getUuid();
}

@Test
public void testLogin() {
    login();
    assertNotNull( uuid );
}

@Test
public void someOtherTest() {
    login();

    ... test something else which needs uuid ...
}

@Test
public void testWithoutLogin() {
    ... usual test code ...
}

这种方法可确保为需要它的每个测试调用login()，并对其进行了单独测试，并且您可以独立运行每个测试.

I have a test class extending junit.framework.TestCase with several test methods.Each method opens a HTTP connection to server and exchange request and response json strings.One method gets a response with a string called UID(similar to sessionId) which i need to use in subsequent requests to the server.

I was previously writing that string to a file and my next requests read that file for string.I am running one method at a time.Now I am trying to use that string without file operations.I maintained a hastable(because there are many UIDs to keep track of) in my test class as instance variable for the purpose , but eventually found that class is getting loaded for my each method invocation as my static block is executing everytime.This is causing the loss of those UIDs.

How do I achieve this without writing to file and reading from it?

I doubt whether my heading matches my requirement.Someone please edit it accordingly.

解决方案

You will need a static variable for this because each test gets its own instance of the test class.

Use this pattern:

private static String uuid;

private void login() {
    // Run this only once
    if (null != uuid) return;

    ... talk to your server ...
    uuid = responseFromServer.getUuid();
}

@Test
public void testLogin() {
    login();
    assertNotNull( uuid );
}

@Test
public void someOtherTest() {
    login();

    ... test something else which needs uuid ...
}

@Test
public void testWithoutLogin() {
    ... usual test code ...
}

This approach makes sure that login() is called for each test that needs it, that it's tested on its own and that you can run each test independently.

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