Java Timeout test with JUnit: Timeout Test example

Java Unit Test: Exercise-5 with Solution

Write a Java program that implements parameterized test to verify that a method behaves correctly for different input values.

Sample Solution:

Java Code:

// TimeoutTest.java

import org.junit.Test;
import org.junit.Rule;
import org.junit.rules.Timeout;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class TimeoutTest {

    // Rule to set a timeout for all test methods in this class
    @Rule
    public Timeout globalTimeout = new Timeout(2); // Set the timeout in seconds

    // Example class with the method to be tested
    public static class ExampleClass {
        public void longRunningMethod() {
            // Simulate a long-running operation
            try {
                Thread.sleep(3000); // Sleep for 3 seconds
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    // JUnit test case with a timeout for the specific method
    @Test(timeout = 2000) // Set the timeout in milliseconds
    public void testLongRunningMethod() {
        ExampleClass example = new ExampleClass();
        example.longRunningMethod();
    }

    // Main function to run JUnit tests
    public static void main(String[] args) {
        Result result = JUnitCore.runClasses(TimeoutTest.class);

        // Check if there are any failures
        if (result.getFailureCount() > 0) {
            System.out.println("Test failed:");

            // Print details of failures
            for (Failure failure : result.getFailures()) {
                System.out.println(failure.toString());
            }
        } else {
            System.out.println("All tests passed successfully.");
        }
    }
}

Sample Output:

Test failed:
testLongRunningMethod(TimeoutTest): test timed out after 2 milliseconds

Explanation:

In the exercise above-

• @Rule and Timeout: The "globalTimeout" is a JUnit rule annotated with @Rule. It sets a global timeout for all test methods in the class. The timeout is specified in seconds using the "Timeout" rule.
• ExampleClass: This inner class represents a hypothetical class (ExampleClass) with a method (longRunningMethod) that simulates a long-running operation by sleeping for 3 seconds.
• @Test(timeout = 2000): The "testLongRunningMethod" method is a JUnit test case annotated with @Test. It tests the "longRunningMethod" and specifies a timeout of 2000 milliseconds (2 seconds) for this specific test.
• main Method: The main method is used to run the JUnit tests. It utilizes "JUnitCore.runClasses" to execute the tests and prints whether the tests passed or failed, along with details of any failures.

Flowchart:

Java Code Editor:

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