PHP コードのテスト機能の分析と最適化に関するディスカッション

<?php
use PHPUnitFrameworkTestCase;

class MyTest extends TestCase
{
    public function testAddition()
    {
        $result = sum(2, 3);
        $this->assertEquals(5, $result);
    }
    
    public function testDivision()
    {
        $result = divide(10, 2);
        $this->assertEquals(5, $result);
    }
    
    // more test cases...
}

function sum($a, $b)
{
    return $a + $b;
}

function divide($a, $b)
{
    if ($b == 0) {
        throw new Exception('Division by zero');
    }
    
    return $a / $b;
}

<?php
class ShoppingCartTest extends PHPUnit_Framework_TestCase
{
    public function testEmptyCart()
    {
        $cart = new ShoppingCart();
        $this->assertEquals(0, $cart->getTotalItems());
    }

    public function testAddToCart()
    {
        $cart = new ShoppingCart();
        $cart->addItem('item1', 10, 1);
        $this->assertEquals(1, $cart->getTotalItems());
    }
    
    // more test cases...
}

class ShoppingCart
{
    protected $items = [];
    
    public function getTotalItems()
    {
        return count($this->items);
    }

    public function addItem($name, $price, $quantity)
    {
        $item = [
            'name' => $name,
            'price' => $price,
            'quantity' => $quantity
        ];
        
        $this->items[] = $item;
    }
    
    // more methods...
}

<?php
// 不优化的查询
$query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";

// 优化后的查询
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ? AND password = ?");
$stmt->bind_param('ss', $username, $password);
$stmt->execute();
$result = $stmt->get_result();

<?php
$value = $cache->get('key');
if ($value === false) {
    $value = expensiveFunction();
    $cache->set('key', $value, 60); // 60秒过期
}