bug #35254 [PHPUnit-Bridge] Fail-fast in simple-phpunit if one of the…

… passthru() commands fails (mpdude)

This PR was squashed before being merged into the 3.4 branch.

Discussion
----------

[PHPUnit-Bridge] Fail-fast in simple-phpunit if one of the passthru() commands fails

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Some commands executed by the `simple-phpunit` script are not checked for success. For example [here](https://travis-ci.org/twigphp/Twig/jobs/634110681), Composer fails with the message

```
  [InvalidArgumentException]
  Could not find package phpunit/phpunit with version 7.5.* in a version inst
  allable using your PHP version 7.0.25.
```

Yet, the `simple-phpunit` script happily continues, going over failing `chdir()`, `file_get_contents()` and `include()` calls and eventually returns a successful `0` exit code. So CI tests look OK when in fact PHPUnit was not even downloaded.

Commits
-------

576e185 [PHPUnit-Bridge] Fail-fast in simple-phpunit if one of the passthru() commands fails

src/Symfony/Bridge/PhpUnit/bin/simple-phpunit

@@ -15,6 +15,14 @@
 
 error_reporting(-1);
 
+$passthruOrFail = function ($command) {
+    passthru($command, $status);
+
+    if ($status) {
+        exit($status);
+    }
+};
+
 if (PHP_VERSION_ID >= 70200) {
     // PHPUnit 6 is required for PHP 7.2+
     $PHPUNIT_VERSION = getenv('SYMFONY_PHPUNIT_VERSION') ?: '6.5';
@@ -77,25 +85,25 @@ if (!file_exists("$PHPUNIT_DIR/phpunit-$PHPUNIT_VERSION/phpunit") || md5_file(__
         rename("phpunit-$PHPUNIT_VERSION", "phpunit-$PHPUNIT_VERSION.old");
         passthru(sprintf('\\' === DIRECTORY_SEPARATOR ? 'rmdir /S /Q %s': 'rm -rf %s', "phpunit-$PHPUNIT_VERSION.old"));
     }
-    passthru("$COMPOSER create-project --no-install --prefer-dist --no-scripts --no-plugins --no-progress --ansi phpunit/phpunit phpunit-$PHPUNIT_VERSION \"$PHPUNIT_VERSION.*\"");
+    $passthruOrFail("$COMPOSER create-project --no-install --prefer-dist --no-scripts --no-plugins --no-progress --ansi phpunit/phpunit phpunit-$PHPUNIT_VERSION \"$PHPUNIT_VERSION.*\"");
     @copy("phpunit-$PHPUNIT_VERSION/phpunit.xsd", 'phpunit.xsd');
     chdir("phpunit-$PHPUNIT_VERSION");
     if ($SYMFONY_PHPUNIT_REMOVE) {
-        passthru("$COMPOSER remove --no-update ".$SYMFONY_PHPUNIT_REMOVE);
+        $passthruOrFail("$COMPOSER remove --no-update ".$SYMFONY_PHPUNIT_REMOVE);
     }
     if (5.1 <= $PHPUNIT_VERSION && $PHPUNIT_VERSION < 5.4) {
-        passthru("$COMPOSER require --no-update phpunit/phpunit-mock-objects \"~3.1.0\"");
+        $passthruOrFail("$COMPOSER require --no-update phpunit/phpunit-mock-objects \"~3.1.0\"");
     }
 
-    passthru("$COMPOSER config --unset platform");
+    $passthruOrFail("$COMPOSER config --unset platform");
     if (file_exists($path = $root.'/vendor/symfony/phpunit-bridge')) {
-        passthru("$COMPOSER require --no-update symfony/phpunit-bridge \"*@dev\"");
-        passthru("$COMPOSER config repositories.phpunit-bridge path ".escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $path)));
+        $passthruOrFail("$COMPOSER require --no-update symfony/phpunit-bridge \"*@dev\"");
+        $passthruOrFail("$COMPOSER config repositories.phpunit-bridge path ".escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $path)));
         if ('\\' === DIRECTORY_SEPARATOR) {
             file_put_contents('composer.json', preg_replace('/^( {8})"phpunit-bridge": \{$/m', "$0\n$1    ".'"options": {"symlink": false},', file_get_contents('composer.json')));
         }
     } else {
-        passthru("$COMPOSER require --no-update symfony/phpunit-bridge \"*\"");
+        $passthruOrFail("$COMPOSER require --no-update symfony/phpunit-bridge \"*\"");
     }
     $prevRoot = getenv('COMPOSER_ROOT_VERSION');
     putenv("COMPOSER_ROOT_VERSION=$PHPUNIT_VERSION.99");