Order of execution of tests in TestNG

Question

How to customize the order of execution of tests in TestNG?

For example:

public class Test1 {   @Test   public void test1() {       System.out.println("test1");   }    @Test   public void test2() {       System.out.println("test2");   }    @Test   public void test3() {       System.out.println("test3");   } } 

In the above suite, the order of execution of tests is arbitrary. For one execution the output may be:

test1 test3 test2 

How do I execute the tests in the order in which they've been written?

Answer 1

This will work.

@Test(priority=1) public void Test1() {  }  @Test(priority=2) public void Test2() {  }  @Test(priority=3) public void Test3() {  } 

priority encourages execution order but does not guarantee the previous priority level has completed. test3 could start before test2 completes. If a guarantee is needed, then declare a dependency.

Unlike the solutions which declare dependencies, tests which use priority will execute even if one test fails. This problem with dependencies can be worked around with @Test(...alwaysRun = true...) according to documentation.