Master PHPUnit Testing with MariaDB Integration for Developers

Introduction

PHPUnit is an essential tool for testing PHP code to ensure it behaves as expected. In this beginner-level guide, we’ll walk you through setting up a basic WordPress plugin that connects to an existing MariaDB database table named “people”. This tutorial will cover connecting to the database, retrieving data, updating records, inserting new records, and deleting records.

Prerequisites

• Basic understanding of PHP.
• A WordPress installation.
• MariaDB server with the “people” table set up.

Step 1: Setting Up PHPUnit in WordPress

First, you need to install PHPUnit in your WordPress environment. You can use Composer for this:

composer require --dev phpunit/phpunit ^9

Step 2: Creating a Basic Plugin Structure

Create a new folder named people-manager in the wp-content/plugins/ directory of your WordPress installation. Inside this folder, create the following files:

• plugin.php
• db.php
• views/list-people.php
• tests/TestPeopleManager.php

Step 3: Connecting to MariaDB

Create a file named db.php in the people-manager/ directory and add the following code:

<?php
class PeopleManager {
    private $conn;

    public function __construct($servername, $username, $password, $dbname) {
        $this->conn = new mysqli($servername, $username, $password, $dbname);
        if ($this->conn->connect_error) {
            die("Connection failed: " . $this->conn->connect_error);
        }
    }

    public function getAllPeople() {
        $sql = "SELECT * FROM people";
        $result = $this->conn->query($sql);

        $people = [];
        if ($result->num_rows > 0) {
            while ($row = $result->fetch_assoc()) {
                $people[] = $row;
            }
        }

        return $people;
    }

    public function updatePerson($id, $username, $name, $age, $verified) {
        $sql = "UPDATE people SET username='$username', name='$name', age=$age, verified=$verified WHERE id=$id";
        if ($this->conn->query($sql) === TRUE) {
            return true;
        } else {
            return false;
        }
    }

    public function insertPerson($username, $name, $age, $verified) {
        $sql = "INSERT INTO people (username, name, age, verified) VALUES ('$username', '$name', $age, $verified)";
        if ($this->conn->query($sql) === TRUE) {
            return true;
        } else {
            return false;
        }
    }

    public function deletePerson($id) {
        $sql = "DELETE FROM people WHERE id=$id";
        if ($this->conn->query($sql) === TRUE) {
            return true;
        } else {
            return false;
        }
    }

    public function closeConnection() {
        $this->conn->close();
    }
}
?>

Step 4: Displaying People Data

Create a file named list-people.php in the people-manager/views/ directory and add the following code:

<?php
if (!defined('ABSPATH')) exit; // Exit if accessed directly

require_once 'db.php';

$servername = 'your_servername';
$username = 'your_username';
$password = 'your_password';
$dbname = 'your_database';

$peopleManager = new PeopleManager($servername, $username, $password, $dbname);
$people = $peopleManager->getAllPeople();
?>

<table>
    <tr>
        <th>ID</th>
        <th>Username</th>
        <th>Name</th>
        <th>Age</th>
        <th>Verified</th>
        <th>Action</th>
    </tr>
    <?php foreach ($people as $person): ?>
        <tr>
            <td><?php echo $person['id']; ?></td>
            <td><?php echo $person['username']; ?></td>
            <td><?php echo $person['name']; ?></td>
            <td><?php echo $person['age']; ?></td>
            <td><?php echo $person['verified'] ? 'Yes' : 'No'; ?></td>
            <td>
                <a href="update.php?id=<?php echo $person['id']; ?>">Update</a> |
                <a href="delete.php?id=<?php echo $person['id']; ?>">Delete</a>
            </td>
        </tr>
    <?php endforeach; ?>
</table>

<?php
$peopleManager->closeConnection();
?>

Step 5: Writing a Test Case

Create a file named TestPeopleManager.php in the people-manager/tests/ directory and add the following code:

<?php
use PHPUnit\Framework\TestCase;

class TestPeopleManager extends TestCase {
    public function testGetAllPeople() {
        $servername = 'your_servername';
        $username = 'your_username';
        $password = 'your_password';
        $dbname = 'your_database';

        $peopleManager = new PeopleManager($servername, $username, $password, $dbname);
        $people = $peopleManager->getAllPeople();

        $this->assertNotEmpty($people);
    }
}
?>

Step 6: Running the Tests

Navigate to your WordPress admin area and use the PHPUnit plugin or run tests from the command line:

./vendor/bin/phpunit people-manager/tests/

Conclusion

This tutorial provides a basic introduction to integrating PHPUnit with a MariaDB database in a WordPress plugin. You can expand this application by adding more features, such as user authentication, form validation, and more sophisticated error handling.

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