@Order for execution order in JUnit - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the @Order annotation in JUnit?

The @Order annotation specifies the order in which test methods are executed within a test class. It helps control test execution sequence.

beginner

How do you use @Order to run a test method first?

You add @Order(1) above the test method. Lower numbers run before higher numbers.

beginner

Can @Order be used without specifying a test method order?

No. @Order requires a numeric value to define the execution order. Without a value, it has no effect.

intermediate

What happens if two test methods have the same @Order value?

JUnit runs them in an undefined order relative to each other. It's best to use unique order values to avoid confusion.

beginner

Write a simple example of using @Order in a JUnit 5 test class.

import org.junit.jupiter.api.*;
import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;

@TestMethodOrder(OrderAnnotation.class)
class MyTests {
  @Test
  @Order(2)
  void secondTest() {
    Assertions.assertTrue(true);
  }

  @Test
  @Order(1)
  void firstTest() {
    Assertions.assertTrue(true);
  }
}

What annotation must be added to a JUnit 5 test class to enable @Order on test methods?

A @TestMethodOrder(OrderAnnotation.class)

B @EnableOrder

C @OrderEnabled

D @TestOrder

You must add @TestMethodOrder(OrderAnnotation.class) to the test class to tell JUnit to use the @Order annotation for method execution order.

If a test method has @Order(3), when will it run compared to a method with @Order(1)?

A Before the method with @Order(1)

B After the method with @Order(1)

C At the same time as the method with @Order(1)

D Order does not affect execution

Lower @Order values run first, so @Order(3) runs after @Order(1).

What happens if you do not use @TestMethodOrder but use @Order on test methods?

A Tests run randomly

B Tests run in the order specified by @Order

C Tests fail to run

D Tests run in default order ignoring @Order

Without @TestMethodOrder(OrderAnnotation.class), JUnit ignores @Order and runs tests in default order.

Which of these is a valid @Order value?

A 1

B "first"

C true

D null

@Order requires an integer value to specify execution order.

Why might you want to control test execution order with @Order?

A To ensure tests run independently

B To speed up test execution

C To run tests in a specific sequence when order matters

D To disable tests

You use @Order to run tests in a specific sequence when some tests depend on others or for logical flow.

Explain how to use @Order to control the execution order of test methods in JUnit 5.

Think about the class-level annotation and method-level annotations.

What are the consequences of having duplicate @Order values on test methods?

Consider how JUnit handles ties in order values.