Junit: Ordering test cases execution

By default, junit do not specify the execution order of the test cases (Order of execution depends on the order returned by the reflection API).

Junit provides '@FixMethodOrder' annotation, to order the execution of test cases.

Example

@FixMethodOrder(MethodSorters.NAME_ASCENDING)

public class TestApp {

}

In the above example, test cases in TestApp class will execute in lexicographic order.

MethodSorters is an enumerator, provides below constants.

NAME_ASCENDING: Sorts the test methods by the method name, in lexicographic order.

JVM: Execute test methods in the order returned by the JVM.

DEFAULT: Sorts the test methods in a deterministic, but not predictable, order

When I check the code, the default method sorter is implemented like below.

 public static final Comparator<Method> DEFAULT = new Comparator<Method>() {

        public int compare(Method m1, Method m2) {

            int i1 = m1.getName().hashCode();

            int i2 = m2.getName().hashCode();

            if (i1 != i2) {

                return i1 < i2 ? -1 : 1;

            }

            return NAME_ASCENDING.compare(m1, m2);

        }

    };

Find the below working application.

TestApp.java

package com.sample.test;

import static org.junit.Assert.assertTrue;

import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;

@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class TestApp {

 @Test
 public void testCase3() {
  System.out.println("Executing test case 3");
  assertTrue(true);
 }

 @Test
 public void testCase2() {
  System.out.println("Executing test case 2");
  assertTrue(true);
 }

 @Test
 public void testCase4() {
  System.out.println("Executing test case 4");
  assertTrue(true);
 }

 @Test
 public void testCase1() {
  System.out.println("Executing test case 1");
  assertTrue(true);
 }

 @Test
 public void testCase5() {
  System.out.println("Executing test case 5");
  assertTrue(true);
 }

}

When you ran above class, you can able to see below messages in the console.

Executing test case 1

Executing test case 2

Executing test case 3

Executing test case 4

Executing test case 5

Previous                                                 Next                                                 Home