@Order for execution order in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the execution order of the test method using @Order.

JUnit

@Test
@Order([1])
void testFirst() {
    // test logic here
}

Drag options to blanks, or click blank then click option'

A0

B5

C-1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or negative numbers.

Omitting the @Order annotation and expecting order.

The @Order annotation takes an integer value to specify the order. Lower numbers run first. Use '1' for the first test method.

2fill in blank

medium

Complete the code to import the correct package for the @Order annotation.

JUnit

import [1];

@Test
@Order(2)
void testSecond() {
    // test logic
}

Drag options to blanks, or click blank then click option'

Aorg.junit.jupiter.api.Order

Borg.junit.Test

Corg.junit.Before

Dorg.junit.jupiter.api.Test

Attempts:

3 left

💡 Hint

Common Mistakes

Importing @Order from the wrong package causing compilation errors.

Confusing @Order with @Test import.

The @Order annotation is part of the JUnit Jupiter API package 'org.junit.jupiter.api.Order'.

3fill in blank

hard

Fix the error in the test class to ensure methods run in the specified order.

JUnit

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.TestMethodOrder;
import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;

@TestMethodOrder([1].class)
class MyTests {

    @Test
    @Order(1)
    void firstTest() {}

    @Test
    @Order(2)
    void secondTest() {}
}

Drag options to blanks, or click blank then click option'

AOrderAnnotation

BOrder

CTestMethodOrder

DMethodOrderer

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Order instead of OrderAnnotation in @TestMethodOrder.

Using MethodOrderer.class which is an interface, not a class.

The @TestMethodOrder annotation requires a class that implements MethodOrderer. 'OrderAnnotation.class' is the correct class to specify ordering by @Order.

4fill in blank

hard

Fill both blanks to create a test class that runs testOne first (@Order(1)), then testThree (@Order(3)).

JUnit

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.TestMethodOrder;
import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;

@TestMethodOrder([1].class)
class OrderedTests {

    @Test
    @Order([2])
    void testOne() {}

    @Test
    @Order(3)
    void testThree() {}
}

Drag options to blanks, or click blank then click option'

AOrderAnnotation

B1

C2

DTestMethodOrder

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong class in @TestMethodOrder.

Setting @Order values incorrectly causing wrong execution order.

Use @TestMethodOrder(OrderAnnotation.class) to enable ordering by @Order. The testOne method should have @Order(1) to run before testThree with @Order(3).

5fill in blank

hard

Fill all three blanks to define a test class with three tests running testFirst (@Order(1)) first, testSecond (@Order(2)), then testThird (@Order(3)).

JUnit

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.TestMethodOrder;
import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;

@TestMethodOrder([1].class)
class MultiOrderTests {

    @Test
    @Order([2])
    void testSecond() {}

    @Test
    @Order([3])
    void testThird() {}

    @Test
    @Order(1)
    void testFirst() {}
}

Drag options to blanks, or click blank then click option'

AOrderAnnotation

B2

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up order numbers causing unexpected test execution order.

Forgetting to use OrderAnnotation.class in @TestMethodOrder.

Use @TestMethodOrder(OrderAnnotation.class) to enable ordering. Set @Order(2) for testSecond and @Order(3) for testThird so the execution order is testFirst(1), testSecond(2), testThird(3).

Practice

1. What does the @Order annotation do in JUnit testing?

easy

A. It sets the order in which test methods are executed.

B. It skips the annotated test method during execution.

C. It marks a test method as disabled.

D. It repeats the test method multiple times.

Solution

1. Step 1: Understand the purpose of @Order

   The @Order annotation is used to specify the sequence in which test methods run.

2. Step 2: Compare with other options

   Skipping, disabling, or repeating tests are done by other annotations like @Disabled or loops, not @Order.

3. Final Answer:

   It sets the order in which test methods are executed. -> Option A

4. Quick Check:

   @Order controls test execution order [OK]

Hint: Remember: @Order controls test run sequence [OK]

Common Mistakes:

• Confusing @Order with @Disabled
• Thinking @Order repeats tests
• Assuming @Order skips tests

2. Which annotation must be added to a JUnit test class to enable @Order annotations on its methods?

easy

A. @TestMethodOrder(OrderAnnotation.class)

B. @TestOrder

C. @OrderEnabled

D. @EnableOrder

Solution

1. Step 1: Recall the class-level annotation for ordering

   JUnit requires @TestMethodOrder(OrderAnnotation.class) on the test class to activate @Order on methods.

2. Step 2: Verify other options

   Options B, C, and D are not valid JUnit annotations.

3. Final Answer:

   @TestMethodOrder(OrderAnnotation.class) -> Option A

4. Quick Check:

   Enable ordering with @TestMethodOrder(OrderAnnotation.class) [OK]

Hint: Use @TestMethodOrder(OrderAnnotation.class) to activate @Order [OK]

Common Mistakes:

• Using non-existent annotations like @TestOrder
• Forgetting to add @TestMethodOrder on class
• Confusing method-level and class-level annotations

3. Given the following JUnit test class, in what order will the test methods run?

@TestMethodOrder(OrderAnnotation.class)
class SampleTest {
  @Test
  @Order(2)
  void testB() {}

  @Test
  @Order(1)
  void testA() {}

  @Test
  @Order(3)
  void testC() {}
}

medium

A. testB, testC, testA

B. testA, testB, testC

C. testC, testB, testA

D. testB, testA, testC

Solution

1. Step 1: Identify the order values

   testA has @Order(1), testB has @Order(2), testC has @Order(3).

2. Step 2: Arrange tests by ascending order

   Tests run from lowest to highest order number: testA, testB, then testC.

3. Final Answer:

   testA, testB, testC -> Option B

4. Quick Check:

   Lower @Order number runs first [OK]

Hint: Lower @Order number runs before higher [OK]

Common Mistakes:

• Assuming declaration order matters over @Order
• Mixing up ascending and descending order
• Ignoring @TestMethodOrder annotation

4. What is wrong with this JUnit test class if the tests do not run in the expected order?

class MyTests {
  @Test
  @Order(1)
  void firstTest() {}

  @Test
  @Order(2)
  void secondTest() {}
}

medium

A. @Order values must start from 0, not 1.

B. Test methods must be static to use @Order.

C. @Order annotation cannot be used with @Test.

D. Missing @TestMethodOrder(OrderAnnotation.class) on the class.

Solution

1. Step 1: Check class-level annotation

   The class lacks @TestMethodOrder(OrderAnnotation.class), so @Order annotations are ignored.

2. Step 2: Verify other options

   @Order values can start at 1, @Order works with @Test, and test methods do not need to be static.

3. Final Answer:

   Missing @TestMethodOrder(OrderAnnotation.class) on the class. -> Option D

4. Quick Check:

   Class must have @TestMethodOrder to enable @Order [OK]

Hint: Add @TestMethodOrder(OrderAnnotation.class) on class to enable ordering [OK]

Common Mistakes:

• Forgetting class-level @TestMethodOrder annotation
• Thinking @Order needs static methods
• Believing @Order values must start at zero

5. You have a JUnit test class with methods annotated with @Order values 1, 2, and 2. What will happen when you run the tests with @TestMethodOrder(OrderAnnotation.class)?

hard

A. Tests with duplicate order values are skipped.

B. JUnit throws a runtime error due to duplicate order values.

C. Tests with the same order value run in declaration order among themselves.

D. Tests run in random order ignoring the duplicate values.

Solution

1. Step 1: Understand behavior with duplicate @Order values

   JUnit allows duplicate order values; tests with the same order run in the order they appear in the code.

2. Step 2: Check other options

   JUnit does not throw errors or skip tests due to duplicate order values, nor does it randomize them.

3. Final Answer:

   Tests with the same order value run in declaration order among themselves. -> Option C

4. Quick Check:

   Duplicate @Order runs in code order [OK]

Hint: Duplicate @Order runs in source code order [OK]

Common Mistakes:

• Expecting errors on duplicate @Order values
• Assuming tests with same order run randomly
• Thinking duplicates cause tests to skip