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Test Suite 

 
/**
 * TEST SUITE - RUN MULTIPLE TEST CLASSES TOGETHER
 * -----------------------------------------------
 * A Test Suite lets you group several test classes and run them as a unit.
 * 
 * WHY USE A SUITE?
 * ----------------
 *  - To run related tests together (e.g., integration tests)
 *  - To share expensive setup across multiple test classes
 *  - To control execution order
 * 
 * In this example:
 *  - @BeforeClass opens a shared "database connection"
 *  - @AfterClass closes it
 *  - UserTest and OrderTest both run inside the same suite
 */

package com.minte9.junit.test_suite;

import org.junit.BeforeClass;
import org.junit.AfterClass;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;

@RunWith(Suite.class)
@Suite.SuiteClasses({
        UserTest.class,
        OrderTest.class
})
public class SuiteTest {

    @BeforeClass
    public static void globalSetup() {
        System.out.println("Connecting to test database...");
    }

    @AfterClass
    public static void globalTeardown() {
        System.out.println("Closing test databases...");
    }
}

/*
    Connecting to test database...
    Running UserTest.testCreateUser
    Running UserTest.testDeleteUser
    Running OrderTest.testPlaceOrder
    Closing test databases...
 */

T 
package com.minte9.junit.test_suite;

import org.junit.Test;

public class UserTest {

    @Test
    public void testCreateUser() {
        System.out.println("Running UserTest.testCreateUser");
        // Imagine: insert user into mock DB
    }

    @Test
    public void testDeleteUser() {
        System.out.println("Running UserTest.testDeleteUser");
        // Imagine: delete user from mock DB
    }
}

T 
package com.minte9.junit.test_suite;

import org.junit.Test;

public class OrderTest {

    @Test
    public void testPlaceOrder() {
        System.out.println("Running OrderTest.testPlaceOrder");
        // Imagine: insert order into mock DB
    }
}






Questions and answers:
Clink on Option to Answer




1. What is a JUnit Test Suite used for?

  • a) Running multiple test classes together as one unit
  • b) Running only a single test method

2. Why might you use a test suite?

  • a) To group related tests and optionally share setup
  • b) To disable all tests in the project

3. When does a @BeforeClass method inside a suite run?

  • a) Once before all test classes are executed
  • b) Before every individual test method

4. What is the purpose of @AfterClass in a suite?

  • a) Clean up shared resources after all tests finish
  • b) Close resources after each individual test

5. What happens to the test classes listed in a suite definition?

  • a) They run in the suite as part of one combined execution
  • b) They are ignored unless executed manually

6. Why might a suite improve performance?

  • a) It allows expensive setup (like database initialization) to run only once
  • b) It automatically optimizes slow test code


References: