bug #30496 [PHPUnit-Bridge] override some Composer environment variab…

…les (nicoweb)

This PR was merged into the 3.4 branch.

Discussion
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[PHPUnit-Bridge] override some Composer environment variables

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30467
| License       | MIT
| Doc PR        | -

Override `COMPOSER_VENDOR_DIR` and `COMPOSER_BIN_DIR` with their default values in PHPUnit Bridge: #30467

Commits
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6285026 [PHPUnit-Bridge] override some environment variables

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

@@ -26,10 +26,7 @@ if (PHP_VERSION_ID >= 70200) {
     $PHPUNIT_VERSION = '4.8';
 }
 
-if ('composer.json' !== $COMPOSER_JSON = getenv('COMPOSER') ?: 'composer.json') {
-    putenv('COMPOSER=composer.json');
-    $_SERVER['COMPOSER'] = $_ENV['COMPOSER'] = 'composer.json';
-}
+$COMPOSER_JSON = getenv('COMPOSER') ?: 'composer.json';
 
 $root = __DIR__;
 while (!file_exists($root.'/'.$COMPOSER_JSON) || file_exists($root.'/DeprecationErrorHandler.php')) {
@@ -47,6 +44,19 @@ if ('phpdbg' === PHP_SAPI) {
     $PHP .= ' -qrr';
 }
 
+$defaultEnvs = [
+    'COMPOSER' => 'composer.json',
+    'COMPOSER_VENDOR_DIR' => 'vendor',
+    'COMPOSER_BIN_DIR' => 'bin',
+];
+
+foreach ($defaultEnvs as $envName => $envValue) {
+    if ($envValue !== getenv($envName)) {
+        putenv("$envName=$envValue");
+        $_SERVER[$envName] = $_ENV[$envName] = $envValue;
+    }
+}
+
 $COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar') || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar 2> /dev/null`))
     ? $PHP.' '.escapeshellarg($COMPOSER)
     : 'composer';