TestNG简单的学习（九）TestNG Method Interceptors 的使用

 

TestNG官方网站：

http://testng.org/doc/documentation-main.html

 

官方文档：

5.16 - Method Interceptors
Once TestNG has calculated in what order the test methods will be invoked, these methods are split in two groups:
Methods run sequentially. These are all the test methods that have dependencies or dependents. These methods will be run in a specific order.
Methods run in no particular order. These are all the methods that don't belong in the first category. The order in which these test methods are run is random and can vary from one run to the next (although by default, TestNG will try to group test methods by class).
In order to give you more control on the methods that belong to the second category, TestNG defines the following interface: public interface IMethodInterceptor { 

    

  List<IMethodInstance> intercept(List<IMethodInstance> methods, ITestContext context); 

  

}
The list of methods passed in parameters are all the methods that can be run in any order. Your intercept method is expected to return a similar list of IMethodInstance, which can be either of the following:
The same list you received in parameter but in a different order.
A smaller list of IMethodInstance objects.
A bigger list of IMethodInstance objects.
Once you have defined your interceptor, you pass it to TestNG as a listener. For example:

Shelljava -classpath "testng-jdk15.jar:test/build" org.testng.TestNG -listener test.methodinterceptors.NullMethodInterceptor 

   -testclass test.methodinterceptors.FooTest
For the equivalent ant syntax, see the listeners attribute in the ant documentation.
For example, here is a Method Interceptor that will reorder the methods so that test methods that belong to the group "fast" are always run first:

/**
 * 
 */
package com.easyway.testng.junit;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.testng.IMethodInstance;
import org.testng.IMethodInterceptor;
import org.testng.ITestContext;
import org.testng.annotations.Test;

/**
 * @author longgangbai 2013-11-29 下午4:31:40
 * 
 */
public class MyMethodInterceptor implements IMethodInterceptor {

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.testng.IMethodInterceptor#intercept(java.util.List,
	 * org.testng.ITestContext)
	 */
	@Override
	public List<IMethodInstance> intercept(List<IMethodInstance> methods,
			ITestContext context) {
		List<IMethodInstance> result = new ArrayList<IMethodInstance>();

		for (IMethodInstance m : methods) {
			Test test = m.getMethod().getConstructorOrMethod().getMethod()
					.getAnnotation(Test.class);
			Set<String> groups = new HashSet<String>();
			for (String group : test.groups()) {
				groups.add(group);
			}
			System.out.println("groups +"+groups );
			if (groups.contains("fast")) {
				result.add(0, m);
			} else {
				result.add(m);
			}
		}
		return result;
	}
}

 

 

/**
 * 
 */
package com.easyway.testng.junit;

import org.testng.annotations.Test;

/**
 * @author longgangbai
 * 2013-11-29  下午4:36:54
 *
 */
public class MyMethodInterceptorTest {
	@Test(groups={"fast"})
	public void test1() { 
		System.out.println("=================test1=============");
	}  

	   
    
	@Test
	public void test2() {  
		System.out.println("=================test2=============");
	} 
	@Test(groups="init")
	public void test3() {  
		System.out.println("=================test3=============");
	} 
}

 

package com.easyway.testng.junit;

import org.testng.TestNG;

/**
 * @author longgangbai
 * 2013-11-29  下午4:20:51
 *
 */
public class MyMethodInterceptorTestMain {

	public static void main(String[] args) {
		TestNG tng = new TestNG();  
		tng.addListener( new MyMethodInterceptor());
		tng.setTestClasses(new Class[]{MyMethodInterceptorTest.class});
		tng.run();
	}
}

 测试结果：

[TestNG] Running:
  Command line suite

groups +[fast]
groups +[]
groups +[init]
groups +[fast]
groups +[]
groups +[init]
=================test1=============
=================test2=============
=================test3=============

===============================================
Command line suite
Total tests run: 3, Failures: 0, Skips: 0
===============================================