如何使用 PHPUnit 进行 PHP 函数单元测试

composer require --dev phpunit/phpunit

use PHPUnit\Framework\TestCase;

class CalculatorTest extends TestCase
{
    public function testAddition()
    {
        $calculator = new Calculator();
        $result = $calculator->add(2, 3);
        $this->assertEquals(5, $result);
    }

    public function testSubtraction()
    {
        $calculator = new Calculator();
        $result = $calculator->subtract(5, 2);
        $this->assertEquals(3, $result);
    }
}

php vendor/bin/phpunit

// sum.php
function sum($numbers)
{
    $total = 0;
    foreach ($numbers as $number) {
        $total += $number;
    }
    return $total;
}

// sumTest.php
use PHPUnit\Framework\TestCase;

class SumTest extends TestCase
{
    public function testSumEmptyArray()
    {
        $this->assertEquals(0, sum([]));
    }

    public function testSumSingleNumber()
    {
        $this->assertEquals(5, sum([5]));
    }

    public function testSumMultipleNumbers()
    {
        $this->assertEquals(15, sum([5, 10]));
    }
}