Question

I am using TestNG as my Java testing framework, and I have the need for a given test class to maintain some state which will be used by several of the test methods. Specifically, I would like this state to be initialized once, before any tests are run, but then have it be available to any subsequent test in the class.

From what I read, the @BeforeClass annotation can be added to a method, which will run before any tests are run. However, I have been noticing very strange behavior. Consider the following sample code, which is a distilled version of my actual setup:

public class MyTestClass {
    private static String[][] array;

    @BeforeClass
    public void setup() {
        array = new String[][] {{"A", "B", "C"},{"D", "E", "F"},{"G", "H", "I"}};
    }

    @Test
    public void someTest() {
        // use 'array'
        // but the data might be corrupted
    }
}

The above is a simplification, but what I have noticed is that static variables which I initialize in the @BeforeClass method appear to be having their values changed later on.

What is the proper way of setting up some shared/static state for a TestNG unit test?

Answer 1

Unittest methods should not depend on each other in any way and therefor should not share any state!

Answer 2

A static variable may be initialized multiple times depending on your setup. You could initialize using a static initializor instead, or remove the static keyword and use it as an instance variable of the class using the existing configuration:

Example :

public class MyTestClass {
    private static String[][] array;

    static {
        array = new String[][] {{"A", "B", "C"},{"D", "E", "F"},{"G", "H", "I"}};
    }

    @Test
    public void someTest() {
        // use 'array'
        // but the data might be corrupted
    }
}

Or,

public class MyTestClass {
    private String[][] array;

    @BeforeClass
    public void setup() {
        array = new String[][] {{"A", "B", "C"},{"D", "E", "F"},{"G", "H", "I"}};
    }

    @Test
    public void someTest() {
        // use 'array'
        // but the data might be corrupted
    }
}

Answer 3

您可以在声明中使用 final 关键字。

你也可以使用 ITestContext 这里是一个问题http://www.ontestautomation.com/using-the-testng-itestcontext-to-create-smarter-rest-assured-tests/

public class MyTestClass {
    private static final String[][] array;

    @BeforeClass
    public void setup() {
        array = new String[][] {{"A", "B", "C"},{"D", "E", "F"},{"G", "H", "I"}};
    }

    @Test
    public void someTest() {
        // use 'array'
        // but the data might be corrupted
    }
}

How to assign class level data in a TestNG unit test class

3 个答案: