英文:
Why TestNG's beforeSuite only provides a value for one class while the other class gets null?
问题
以下是你提供的代码的翻译部分：
Base.java：
public class Base {
public String name;
@BeforeSuite
public void beforeSuite(){
name = "stackoverflow";
}
}
A.java：
public class A extends Base {
@Test
public void test(){
System.out.println("A name:" + name);
}
}
B.java：
public class B extends Base {
@Test
public void test(){
System.out.println("B name:" + name);
}
}
testng.xml：
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="suite1" parallel="classes" thread-count="1" preserve-order="true">
<test name="testValue">
<classes>
<class name="A"/>
<class name="B"/>
</classes>
</test>
</suite>
测试结果：
mvn clean test
.
.
.
[INFO] Running TestSuite
B name:null
A name:stackoverflow
你提到你的 TestNG 版本是 6.8.8。
英文:
I have a problem with the BeforeSuite annotation in TestNG.
I want to initialize some variables in beforeSuite() so all the classes could use them directly. Only class A can get the value. Class B can't; it gets null.
Base.java:
public class Base {
public String name;
@BeforeSuite
public void beforeSuite(){
name = "stackoverflow";
}
}
A.java:
public class A extends Base{
@Test
public void test(){
System.out.println("A name:" + name);
}
}
B.java
public class B extends Base{
@Test
public void test(){
System.out.println("B name:" + name);
}
}
textng.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="suite1" parallel="classes" thread-count="1" preserve-order="true">
<test name="testValue">
<classes>
<class name="A"/>
<class name="B"/>
</classes>
</test>
</suite>
test result:
mvn clean test
.
.
.
[INFO] Running TestSuite
B name:null
A name:stackoverflow
My TestNG version is 6.8.8.
答案1
得分: 1
问题出在测试代码中。您有一个常见的基类，多个子类扩展了该基类，并且在基类中有一个 @BeforeSuite 方法。
根据 TestNG 的行为，它保证 @BeforeSuite 方法仅在每个 <suite> 标签中执行一次。
在您的情况下，它已经为类 A 调用过，因此在类 B 中将被跳过，这解释了 NullPointerException 的原因。
要解决这个问题，您需要将初始化操作移到 @BeforeMethod 或 @BeforeClass 注解的方法中。
英文:
The problem lies in the test code. You have a common base class that is being extended by multiple child classes and within the base class you have a @BeforeSuite method.
TestNG by behavior, guarantees that the @BeforeSuite method gets executed ONLY once per <suite> tag.
In your case, it already got invoked for class A and so it will be skipped for class B which explains the NullPointerException.
To fix this, you would need to move your initialization to either a @BeforeMethod or @BeforeClass annotated method.
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