Nette Testing

Testing with Nette Tester

We use Nette Tester for unit testing. Test files should have .phpt extension.

composer require nette/tester --dev

Basic Test Structure

<?php

declare(strict_types=1);

use Tester\Assert;
use Nette\Assets\SomeClass;

require __DIR__ . '/../bootstrap.php';


test('SomeClass correctly does something', function () {
	$object = new SomeClass();
	$result = $object->doSomething();

	Assert::same('expected value', $result);
});


test('SomeClass handles edge case properly', function () {
	$object = new SomeClass();
	$result = $object->handleEdgeCase();

	Assert::true($result);
});

Key points:

• Use the test() function for each test case
• The first parameter of test() should be a clear description of what is being tested
• Do not add comments before test() calls - the description parameter serves this purpose
• Group related tests in the same file

Testing Exceptions

To test if code correctly throws exceptions:

Assert::exception(
	fn() => $mapper->getAsset('missing.txt'),
	AssetNotFoundException::class,
	"Asset file 'missing.txt' not found at path: %a%",
);

The Assert::exception() method:

1. First parameter: A closure that should throw the exception
2. Second parameter: Expected exception class
3. Third parameter (optional): Expected exception message, can contain placeholders (%a% means any text)

If the entire test() block is to end with an exception, you can use testException():

testException('throws exception for invalid input', function () {
	$mapper = new FilesystemMapper(__DIR__ . '/fixtures');<br>
	$mapper->getAsset('missing.txt');
}, AssetNotFoundException::class, "Asset file 'missing.txt' not found at path: %a%");

Essential Commands

# Run all tests
composer tester

# Run specific test file
vendor/bin/tester tests/common/Engine.phpt -s -C

# Run tests in specific directory
vendor/bin/tester tests/filters/ -s -C

Static Analysis & Code Quality using PHPStan

# Run PHPStan static analysis
composer phpstan