Ascending Sequences with JUnit 5 Testing

Ascending Sequences with JUnit 5 Testing

Understanding Ascending Sequences An ascending sequence is a list of numbers arranged in increasing order. For example, 1, 2, 3, 4 is an ascending sequence. This concept is often used in programming to manage data, track progress, or order tasks logically.

Writing a Test for Ascending Sequences with JUnit 5

JUnit 5 is a widely-used testing framework in Java. It allows developers to write and execute tests, ensuring that the code behaves as expected. When dealing with ascending sequences, testing can help confirm that a function correctly identifies or creates sequences in the right order.

Why Test Ascending Sequences?

Testing ensures:

1. Correctness – The program generates or validates sequences accurately.
2. Reliability – Code behaves as expected across different scenarios.
3. Maintainability – Easier to spot and fix bugs in your code.

Setting Up a Simple Ascending Sequence Test

Step 1: Add JUnit 5 to Your Project

Ensure your pom.xml (for Maven projects) has the following dependency:

Step 2: Write Your Function

Let’s create a method to check if an array of integers is in ascending order.

Step 3: Create the JUnit Test

Now, write a test case for this method.

Explanation

1. assertTrue and assertFalse – These methods help verify if the output of isAscending matches the expected result.
2. The test checks two scenarios: one with a correct ascending order and one without, ensuring your function works correctly.

Benefits of Using JUnit 5 for Ascending Sequence Testing

• Simple Syntax – Easy to write and understand.
• Flexible Assertions – Verify outputs in different ways.
• Detailed Reports – Identify what went wrong if a test fails.

Testing ascending sequences with JUnit 5 can help make your code robust and error-free. By following a structured approach, you ensure that your function handles all possible cases, leading to more reliable applications.

Example Output:

For the array {1, 2, 3}, the output would be true, confirming it is an ascending sequence.

// Import JUnit 5 annotations and assertions

import org.junit.jupiter.api.*;

import static org.junit.jupiter.api.Assertions.*;

// Tags: JUnit, Testing, Java, AscendingSequenceTest

// Define test order using OrderAnnotation

@TestMethodOrder(MethodOrderer.OrderAnnotation.class)

public class AscendingSequenceTest {

// Tags: JUnit, HappyPath, AscendingSequence, Algorithm

// Description: This test ensures that the ascendingSequenceAlgorithm method generates a correct ascending sequence.

@Test

public void testAscendingSequenceHappyPath() {

// Sequence: 0, 1, 2, 3, 4, 5

// Explanation: Here, AAA pattern is applied. Block A sets all values.

int start = 0;

int end = 5;

int step = 1;

int[] expectedResult = {0, 1, 2, 3, 4, 5};

// Block A: Actions to obtain actualResult

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

// Block A: Compare expectedResult with actualResult

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, HappyPath, AscendingSequence, Algorithm, RepeatedTest

// Description: This test checks the happy path scenario for positive numbers by repeating the test 50 times.

@Order(1)

@RepeatedTest(50) // Run the test 50 times

@Test

public void testAscendingSequenceHappyPathPositiveNumber() {

// Sequence: 0, 1, 2, 3, 4, 5

int start = 0;

int end = 5;

int step = 1;

int[] expectedResult = {0, 1, 2, 3, 4, 5};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, HappyPath, AscendingSequence, Algorithm, NegativeNumber

// Description: This test checks the happy path scenario for negative numbers.

@Order(2)

@Test

public void testAscendingSequenceHappyPathNegativeNumber() {

// Sequence: -10, -9, -8, -7

int start = -10;

int end = -7;

int step = 1;

int[] expectedResult = {-10, -9, -8, -7};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, HappyPath, AscendingSequence, Algorithm, NegativePositiveNumber

// Description: This test checks the happy path scenario for a mix of negative and positive numbers.

@Order(3)

@Test

public void testAscendingSequenceHappyPathNegativePositiveNumber() {

// Sequence: -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5

int start = -5;

int end = 5;

int step = 1;

int[] expectedResult = {-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, HappyPath, AscendingSequence, Algorithm, StepTwo

// Description: This test checks the happy path scenario for a step of two.

@Order(4)

@Test

public void testAscendingSequenceHappyPathStepTwo() {

// Sequence: 0, 2, 4

int start = 0;

int end = 5;

int step = 2;

int[] expectedResult = {0, 2, 4};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, EdgeCase, AscendingSequence, Algorithm, StartLargerThanEnd

// Description: This test checks the case when the start value is larger than the end value.

@Test

public void testAscendingSequenceStartLargerThanEnd() {

int start = 5;

int end = 0;

int step = 2;

int[] expectedResult = {};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, EdgeCase, AscendingSequence, Algorithm, NegativeStep

// Description: This test checks the case when the step is negative.

@Test

public void testAscendingSequenceNegativeStep() {

int start = 0;

int end = 5;

int step = -1;

int[] expectedResult = {};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

// Tags: JUnit, EdgeCase, AscendingSequence, Algorithm, StepIsZero

// Description: This test checks the case when the step is zero.

@Test

public void testAscendingSequenceStepIsZero() {

int start = 5;

int end = 0;

int step = 0;

int[] expectedResult = {};

AscendingSequence as = new AscendingSequence();

int[] actualResult = as.ascendingSequenceAlgorithm(start, end, step);

assertArrayEquals(expectedResult, actualResult);

}

}