Testing And Benchmarking in PHP

Here’s the translation of the Go testing and benchmarking example to PHP:

Unit testing is an important part of writing principled PHP programs. PHP has several testing frameworks available, but for this example, we'll use PHPUnit, which is one of the most popular.

For the sake of demonstration, this code is in a single file, but it could be split into separate files. Testing code typically lives in a separate directory from the code it tests.

```php
<?php

use PHPUnit\Framework\TestCase;

// We'll be testing this simple implementation of an
// integer minimum. Typically, the code we're testing
// would be in a source file named something like
// `IntUtils.php`, and the test file for it would then
// be named `IntUtilsTest.php`.

function intMin($a, $b) {
    return ($a < $b) ? $a : $b;
}

// A test is created by writing a class that extends TestCase
// with methods beginning with 'test'.
class IntMinTest extends TestCase
{
    public function testIntMinBasic()
    {
        $ans = intMin(2, -2);
        // assertEquals will report test failures but continue
        // executing the test. assertSame is used here as it's
        // a strict comparison (===).
        $this->assertSame(-2, $ans, "intMin(2, -2) = $ans; want -2");
    }

    // Writing tests can be repetitive, so it's common to use
    // a data provider to supply test cases.
    public function intMinProvider()
    {
        return [
            [0, 1, 0],
            [1, 0, 0],
            [2, -2, -2],
            [0, -1, -1],
            [-1, 0, -1],
        ];
    }

    /**
     * @dataProvider intMinProvider
     */
    public function testIntMinTableDriven($a, $b, $want)
    {
        $ans = intMin($a, $b);
        $this->assertSame($want, $ans, "got $ans, want $want");
    }
}

// Benchmark tests in PHP are not as standardized as in some other languages.
// Here's a simple way to benchmark our function:
function benchmarkIntMin($iterations)
{
    $start = microtime(true);
    for ($i = 0; $i < $iterations; $i++) {
        intMin(1, 2);
    }
    $end = microtime(true);
    return ($end - $start) / $iterations;
}

// Usage:
$iterations = 1000000;
$avgTime = benchmarkIntMin($iterations);
echo "Average time per operation: " . ($avgTime * 1000000) . " microseconds\n";

To run the tests, you would typically use the PHPUnit command-line tool:

$ phpunit IntMinTest.php
PHPUnit 9.5.0 by Sebastian Bergmann and contributors.

..                                                                  2 / 2 (100%)

Time: 00:00.002, Memory: 4.00 MB

OK (2 tests, 6 assertions)

To run the benchmark:

$ php -r "require 'IntMinTest.php'; $iterations = 1000000; $avgTime = benchmarkIntMin($iterations); echo 'Average time per operation: ' . ($avgTime * 1000000) . ' microseconds\n';"
Average time per operation: 0.054836 microseconds

Note that PHP doesn’t have built-in benchmarking tools like Go does. For more sophisticated benchmarking, you might want to use a dedicated benchmarking library or tool.

Also, unlike Go, PHP doesn’t have a built-in way to run tests and benchmarks together. You would typically run your tests with PHPUnit and your benchmarks separately.

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