Test suites with @Suite in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a test suite class using @Suite annotation.

JUnit

import org.junit.platform.suite.api.Suite;
import org.junit.platform.suite.api.SelectClasses;

@Suite
@SelectClasses({TestClass1.class, TestClass2.class})
public class [1] {
}

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

ATestSuiteClass

BMyTestSuite

CSuiteRunner

DTestRunner

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid class names or Java keywords.

Omitting the class declaration.

The class name for the test suite can be any valid Java class name. Here, MyTestSuite is a clear and common choice.

2fill in blank

medium

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

JUnit

import [1];

@Suite
public class MyTestSuite {
}

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

Aorg.junit.platform.suite.api.Suite

Borg.junit.Test

Corg.junit.jupiter.api.Test

Dorg.junit.runner.RunWith

Attempts:

3 left

💡 Hint

Common Mistakes

Importing JUnit 4 annotations instead of JUnit 5.

Confusing @Suite with @RunWith.

The @Suite annotation is part of the org.junit.platform.suite.api package in JUnit 5.

3fill in blank

hard

Fix the error in the test suite declaration by completing the missing annotation.

JUnit

import org.junit.platform.suite.api.Suite;
import org.junit.platform.suite.api.SelectClasses;

@Suite
[1]
public class MyTestSuite {
}

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

A@RunWith(Suite.class)

B@SelectPackages("com.example.tests")

C@SelectClasses({TestClass1.class, TestClass2.class})

D@Test

Attempts:

3 left

💡 Hint

Common Mistakes

Using @RunWith which is from JUnit 4.

Using @Test which is for test methods, not suites.

The @SelectClasses annotation specifies which test classes to include in the suite.

4fill in blank

hard

Fill both blanks to create a test suite that selects all tests in a package.

JUnit

import org.junit.platform.suite.api.Suite;
import org.junit.platform.suite.api.[1];

@Suite
@[2]("com.example.tests")
public class PackageTestSuite {
}

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

ASelectPackages

BSelectClasses

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing @SelectClasses with @SelectPackages.

Importing the wrong annotation.

To select all tests in a package, use @SelectPackages annotation.

5fill in blank

hard

Fill both blanks to create a suite that selects specific classes and tags.

JUnit

import org.junit.platform.suite.api.Suite;
import org.junit.platform.suite.api.SelectClasses;
import org.junit.platform.suite.api.[1];

@Suite
@SelectClasses({TestA.class, TestB.class})
@[2]({"fast", "unit"})
public class TaggedTestSuite {
    // Suite runs only tests with specified tags
    // and classes
}

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

AIncludeTags

BExcludeTags

Attempts:

3 left

💡 Hint

Common Mistakes

Using ExcludeTags instead of IncludeTags.

Mismatching import and annotation names.

The @IncludeTags annotation filters tests by tags. It must be imported and used correctly.

Practice

1. What is the main purpose of using @Suite in JUnit testing?

easy

A. To group multiple test classes to run together as one unit

B. To mark a method as a test case

C. To ignore a test class during execution

D. To specify the order of test methods within a class

Solution

1. Step 1: Understand the role of @Suite

   @Suite is an annotation used to create a test suite that groups multiple test classes.

2. Step 2: Compare with other annotations

   @Test marks methods as tests, @Ignore skips tests, and ordering is handled differently, so these do not match @Suite's purpose.

3. Final Answer:

   To group multiple test classes to run together as one unit -> Option A

4. Quick Check:

   @Suite groups classes = B [OK]

Hint: Remember: @Suite groups classes, not individual tests [OK]

Common Mistakes:

• Confusing @Suite with @Test annotation
• Thinking @Suite controls test method order
• Assuming @Suite skips tests

2. Which of the following is the correct way to declare a JUnit 5 test suite using @Suite and @SelectClasses?

easy

A. @Suite
@SelectClasses({TestA.class, TestB.class})
public class AllTests {}

B. @SuiteClasses({TestA.class, TestB.class})
public class AllTests {}

C. @RunWith(Suite.class)
@SuiteClasses({TestA.class, TestB.class})
public class AllTests {}

D. @TestSuite
@SelectClasses({TestA.class, TestB.class})
public class AllTests {}

Solution

1. Step 1: Identify JUnit 5 suite syntax

   JUnit 5 uses @Suite and @SelectClasses annotations together to define a suite.

2. Step 2: Check other options for JUnit 4 syntax or invalid annotations

   @RunWith and @SuiteClasses are JUnit 4 style; @TestSuite is invalid.

3. Final Answer:

   @Suite @SelectClasses({TestA.class, TestB.class}) public class AllTests {} -> Option A

4. Quick Check:

   JUnit 5 suite = @Suite + @SelectClasses [OK]

Hint: JUnit 5 suites use @Suite and @SelectClasses together [OK]

Common Mistakes:

• Using JUnit 4 annotations in JUnit 5 code
• Misspelling @SelectClasses
• Omitting the public class declaration

3. Given the following test suite code, what will happen when you run AllTests?

@Suite
@SelectClasses({TestOne.class, TestTwo.class})
public class AllTests {}

medium

A. Only TestTwo's tests will run

B. Both TestOne and TestTwo classes will run all their test methods

C. Only TestOne's tests will run

D. No tests will run because the suite class is empty

Solution

1. Step 1: Understand @SelectClasses effect

   @SelectClasses lists test classes to include in the suite; all their tests run.

2. Step 2: Confirm suite class content is irrelevant

   The suite class itself is a container; it does not need test methods to run included tests.

3. Final Answer:

   Both TestOne and TestTwo classes will run all their test methods -> Option B

4. Quick Check:

   @SelectClasses runs all listed classes [OK]

Hint: Suite runs all classes listed in @SelectClasses [OK]

Common Mistakes:

• Thinking suite class must have test methods
• Assuming only first class runs
• Believing empty suite class means no tests

4. Identify the error in this JUnit 5 test suite declaration:

@Suite
@SelectClasses({TestA.class, TestB.class})
public void AllTests() {}

medium

A. Suite class must extend a base test class

B. Missing @Test annotation on AllTests method

C. @SelectClasses cannot include multiple classes

D. Suite class should not be a method; it must be a class declaration

Solution

1. Step 1: Check the suite declaration syntax

   The suite must be a class, not a method. Here, 'public void AllTests()' is a method.

2. Step 2: Validate other options

   @Test is not needed on suite, @SelectClasses supports multiple classes, and no inheritance is required.

3. Final Answer:

   Suite class should not be a method; it must be a class declaration -> Option D

4. Quick Check:

   Suite must be a class, not a method [OK]

Hint: Suite must be a class, not a method [OK]

Common Mistakes:

• Writing suite as a method instead of a class
• Adding unnecessary @Test to suite
• Thinking suite must extend another class

5. You want to create a test suite that runs LoginTests, PaymentTests, and LogoutTests classes. Which of the following is the best way to write this suite in JUnit 5?

hard

A. @Suite
@SelectPackages({"com.example.tests"})
public class FullSuite {}

B. @SuiteClasses({LoginTests.class, PaymentTests.class, LogoutTests.class})
public class FullSuite {}

C. @Suite
@SelectClasses({LoginTests.class, PaymentTests.class, LogoutTests.class})
public class FullSuite {}

D. @RunWith(Suite.class)
@SelectClasses({LoginTests.class, PaymentTests.class, LogoutTests.class})
public class FullSuite {}

Solution

1. Step 1: Use correct JUnit 5 annotations

   JUnit 5 uses @Suite and @SelectClasses to specify test classes in a suite.

2. Step 2: Evaluate other options

   @SuiteClasses and @RunWith are JUnit 4 style; @SelectPackages is for packages, not specific classes.

3. Final Answer:

   @Suite @SelectClasses({LoginTests.class, PaymentTests.class, LogoutTests.class}) public class FullSuite {} -> Option C

4. Quick Check:

   JUnit 5 suite = @Suite + @SelectClasses [OK]

Hint: Use @Suite with @SelectClasses listing all test classes [OK]

Common Mistakes:

• Mixing JUnit 4 and 5 annotations
• Using @SelectPackages when classes are needed
• Omitting public class declaration