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Snapshot testing
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‎src/Framework/Environment.php‎

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@@ -27,6 +27,9 @@ class Environment
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/** Thread number when run tests in multi threads */
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public const THREAD = 'NETTE_TESTER_THREAD';
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/** Should Tester update snapshots? */
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public const UPDATE_SNAPSHOTS = 'NETTE_TESTER_UPDATE_SNAPSHOTS';
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/** @var bool used for debugging Tester itself */
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public static $debugMode = true;
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@@ -108,6 +111,11 @@ public static function setupErrors(): void
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self::removeOutputBuffers();
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echo "\nFatal error: $error[message] in $error[file] on line $error[line]\n";
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}
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} elseif (getenv(self::UPDATE_SNAPSHOTS) && Snapshot::$updatedSnapshots) {
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self::removeOutputBuffers();
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echo "\nThe following snapshots were updated, please make sure they are correct:\n"
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. implode("\n", Snapshot::$updatedSnapshots) . "\n";
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exit(Runner\Job::CODE_FAIL);
111119
} elseif (self::$checkAssertions && !Assert::$counter) {
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self::removeOutputBuffers();
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echo "\nError: This test forgets to execute an assertion.\n";

‎src/Framework/Snapshot.php‎

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@@ -0,0 +1,91 @@
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<?php
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/**
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* This file is part of the Nette Tester.
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* Copyright (c) 2009 David Grudl (https://davidgrudl.com)
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*/
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declare(strict_types=1);
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namespace Tester;
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/**
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* Snapshot testing helper.
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*/
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class Snapshot
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{
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public static $snapshotDir = 'snapshots';
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public static $updatedSnapshots = [];
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/**
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* Compares value with a previously created snapshot.
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*/
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public static function match($value, string $snapshotName): void
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{
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$updateSnapshots = (bool) getenv(Environment::UPDATE_SNAPSHOTS);
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$testFile = $_SERVER['argv'][0];
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$snapshotFile = self::getSnapshotFile($testFile, $snapshotName);
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if (!file_exists($snapshotFile)) {
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if (!$updateSnapshots) {
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Assert::fail("Missing snapshot file '$snapshotFile', use --update-snapshots option to generate it.");
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}
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self::write($snapshotFile, $value);
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}
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$snapshot = self::read($snapshotFile);
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try {
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Assert::equal($snapshot, $value, "Snapshot $snapshotName");
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} catch (AssertException $e) {
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if (!$updateSnapshots) {
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throw $e;
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}
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self::write($snapshotFile, $value);
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}
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}
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private static function getSnapshotFile(string $testFile, string $snapshotName): string
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{
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$path = self::$snapshotDir . DIRECTORY_SEPARATOR . pathinfo($testFile, PATHINFO_FILENAME) . '.' . $snapshotName . '.phps';
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if (!preg_match('#/|\w:#A', self::$snapshotDir)) {
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$path = dirname($testFile) . DIRECTORY_SEPARATOR . $path;
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}
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return $path;
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}
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private static function read(string $snapshotFile)
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{
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$snapshotContents = @file_get_contents($snapshotFile);
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if ($snapshotContents === false) {
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throw new \Exception("Unable to read snapshot file '$snapshotFile'.");
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}
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return eval(substr($snapshotContents, strlen('<?php ')));
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}
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private static function write(string $snapshotFile, $value): void
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{
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$snapshotDirectory = dirname($snapshotFile);
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if (!is_dir($snapshotDirectory) && !mkdir($snapshotDirectory)) {
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throw new \Exception("Unable to create snapshot directory '$snapshotDirectory'.");
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}
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$snapshotContents = '<?php return ' . var_export($value, true) . ';' . PHP_EOL;
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if (file_put_contents($snapshotFile, $snapshotContents) === false) {
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throw new \Exception("Unable to write snapshot file '$snapshotFile'.");
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}
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self::$updatedSnapshots[] = $snapshotFile;
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}
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}

‎src/Runner/CliTester.php‎

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Original file line numberDiff line numberDiff line change
@@ -65,6 +65,9 @@ public function run(): ?int
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if (isset($coverageFile)) {
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$runner->setEnvironmentVariable(Environment::COVERAGE, $coverageFile);
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}
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if ($this->options['--update-snapshots']) {
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$runner->setEnvironmentVariable(Environment::UPDATE_SNAPSHOTS, '1');
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}
6871

6972
if ($this->options['-o'] !== null) {
7073
ob_clean();
@@ -117,6 +120,7 @@ private function loadOptions(): CommandLine
117120
--colors [1|0] Enable or disable colors.
118121
--coverage <path> Generate code coverage report to file.
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--coverage-src <path> Path to source code.
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--update-snapshots Create or update snapshot files. Tests with snapshot changes will be marked as skipped.
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-h | --help This help.
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122126
XX

‎src/bootstrap.php‎

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@@ -16,6 +16,7 @@
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require __DIR__ . '/Framework/TestCase.php';
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require __DIR__ . '/Framework/DomQuery.php';
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require __DIR__ . '/Framework/FileMutator.php';
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require __DIR__ . '/Framework/Snapshot.php';
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require __DIR__ . '/CodeCoverage/Collector.php';
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require __DIR__ . '/Runner/Job.php';
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‎tests/Framework/.gitignore‎

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snapshots/

‎tests/Framework/Snapshot.match.phpt‎

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<?php
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declare(strict_types=1);
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use Tester\Assert;
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use Tester\AssertException;
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use Tester\Snapshot;
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require __DIR__ . '/../bootstrap.php';
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Snapshot::$snapshotDir = __DIR__ . '/fixtures';
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Snapshot::match(['answer' => 42], 'existingSnapshot');
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Assert::exception(function () {
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Snapshot::match(['answer' => 43], 'existingSnapshot');
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}, AssertException::class, "Snapshot existingSnapshot: %a% should be equal to %a%");
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Assert::exception(function () {
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Snapshot::match('value', 'nonExistingSnapshot');
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}, AssertException::class, "Missing snapshot file '%A%', use --update-snapshots option to generate it.");

‎tests/Framework/Snapshot.update.phpt‎

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<?php
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declare(strict_types=1);
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use Tester\Assert;
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use Tester\Environment;
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use Tester\Helpers;
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use Tester\Snapshot;
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require __DIR__ . '/../bootstrap.php';
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putenv(Environment::UPDATE_SNAPSHOTS . '=1');
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Snapshot::$snapshotDir = __DIR__ . '/snapshots';
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Helpers::purge(Snapshot::$snapshotDir);
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// newly created
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Assert::false(file_exists(Snapshot::$snapshotDir . '/Snapshot.update.newSnapshot.phps'));
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Snapshot::match(['answer' => 42], 'newSnapshot');
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Assert::true(file_exists(Snapshot::$snapshotDir . '/Snapshot.update.newSnapshot.phps'));
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Assert::contains('42', file_get_contents(Snapshot::$snapshotDir . '/Snapshot.update.newSnapshot.phps'));
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// existing
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25+
file_put_contents(
26+
Snapshot::$snapshotDir . '/Snapshot.update.updatedSnapshot.phps',
27+
'<?php return array(\'answer\' => 43);' . PHP_EOL
28+
);
29+
30+
Assert::true(file_exists(Snapshot::$snapshotDir . '/Snapshot.update.updatedSnapshot.phps'));
31+
Snapshot::match(['answer' => 42], 'updatedSnapshot');
32+
Assert::true(file_exists(Snapshot::$snapshotDir . '/Snapshot.update.updatedSnapshot.phps'));
33+
Assert::contains('42', file_get_contents(Snapshot::$snapshotDir . '/Snapshot.update.updatedSnapshot.phps'));
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// Snapshot::$updatedSnapshots
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37+
Assert::equal([
38+
Snapshot::$snapshotDir . '/Snapshot.update.newSnapshot.phps',
39+
Snapshot::$snapshotDir . '/Snapshot.update.updatedSnapshot.phps',
40+
], Snapshot::$updatedSnapshots);
41+
42+
// reset the env variable so that the test does not fail due to updated snapshots
43+
putenv(Environment::UPDATE_SNAPSHOTS . '=0');

‎tests/Framework/fixtures/Snapshot.match.existingSnapshot.phps‎

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<?php return ['answer' => 42];

‎tests/Runner/Runner.snapshots.phpt‎

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<?php
2+
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declare(strict_types=1);
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5+
use Tester\Assert;
6+
use Tester\Dumper;
7+
use Tester\Runner\Test;
8+
9+
require __DIR__ . '/../bootstrap.php';
10+
require __DIR__ . '/../../src/Runner/OutputHandler.php';
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require __DIR__ . '/../../src/Runner/Test.php';
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require __DIR__ . '/../../src/Runner/TestHandler.php';
13+
require __DIR__ . '/../../src/Runner/Runner.php';
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15+
16+
class Logger implements Tester\Runner\OutputHandler
17+
{
18+
public $results = [];
19+
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public function prepare(Test $test): void
22+
{
23+
}
24+
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26+
public function finish(Test $test): void
27+
{
28+
$this->results[basename($test->getFile())] = [$test->getResult(), $test->message];
29+
}
30+
31+
32+
public function begin(): void
33+
{
34+
}
35+
36+
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public function end(): void
38+
{
39+
}
40+
}
41+
42+
43+
Tester\Helpers::purge(__DIR__ . '/snapshots/snapshots');
44+
45+
46+
// first run, without update -> fail
47+
48+
$runner = new Tester\Runner\Runner(createInterpreter());
49+
$runner->paths[] = __DIR__ . '/snapshots/*.phptx';
50+
$runner->outputHandlers[] = $logger = new Logger;
51+
$runner->run();
52+
53+
Assert::same(Test::FAILED, $logger->results['update-snapshots.phptx'][0]);
54+
Assert::match(
55+
"Failed: Missing snapshot file '%a%', use --update-snapshots option to generate it.\n%A%",
56+
trim(Dumper::removeColors($logger->results['update-snapshots.phptx'][1]))
57+
);
58+
59+
// second run, with update -> skipped
60+
61+
$runner = new Tester\Runner\Runner(createInterpreter());
62+
$runner->paths[] = __DIR__ . '/snapshots/*.phptx';
63+
$runner->outputHandlers[] = $logger = new Logger;
64+
$runner->setEnvironmentVariable(Tester\Environment::UPDATE_SNAPSHOTS, '1');
65+
$runner->run();
66+
67+
Assert::same(Test::FAILED, $logger->results['update-snapshots.phptx'][0]);
68+
Assert::match(
69+
"The following snapshots were updated, please make sure they are correct:\n%a%.snapshot.phps",
70+
trim(Dumper::removeColors($logger->results['update-snapshots.phptx'][1]))
71+
);
72+
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// third run, without update -> pass
74+
75+
$runner = new Tester\Runner\Runner(createInterpreter());
76+
$runner->paths[] = __DIR__ . '/snapshots/*.phptx';
77+
$runner->outputHandlers[] = $logger = new Logger;
78+
$runner->run();
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80+
Assert::same(Test::PASSED, $logger->results['update-snapshots.phptx'][0]);

‎tests/Runner/snapshots/.gitignore‎

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snapshots/

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