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	diff --git a/src/OS/CurrentOS.php b/src/OS/CurrentOS.php
	new file mode 100644
	index 0000000..f957704
	--- /dev/null
	+++ b/src/OS/CurrentOS.php
	@@ -0,0 +1,16 @@
	+<?php
	+declare(strict_types=1);
	+
	+namespace Keruald\OmniTools\OS;
	+
	+class CurrentOS {
	+
	+ public static function isWindows () : bool {
	+ return PHP_OS === 'CYGWIN' \|\| self::isPureWindows();
	+ }
	+
	+ public static function isPureWindows () : bool {
	+ return strtoupper(substr(PHP_OS, 0, 3)) === 'WIN';
	+ }
	+
	+}
	diff --git a/src/OS/CurrentProcess.php b/src/OS/CurrentProcess.php
	new file mode 100644
	index 0000000..8d87faa
	--- /dev/null
	+++ b/src/OS/CurrentProcess.php
	@@ -0,0 +1,34 @@
	+<?php
	+declare(strict_types=1);
	+
	+namespace Keruald\OmniTools\OS;
	+
	+class CurrentProcess {
	+
	+ /**
	+ * Determines if the current process, ie the PHP interpreter,
	+ * runs as root on UNIX systems or in elevated mode on Windows.
	+ *
	+ * Cygwin processes are considered as Windows processes.
	+ */
	+ public static function isPrivileged () : bool {
	+ if (CurrentOS::isWindows()) {
	+ // `net session` is known to only work as privileged process.
	+ // To wrap in cmd allows to avoid /dev/null for Cygwin,
	+ // or $null when invoked from PowerShell. NUL: will always be used.
	+ exec('cmd /C "net session >NUL 2>&1"', $_, $exitCode);
	+
	+ return $exitCode === 0;
	+ }
	+
	+ if (!function_exists('posix_geteuid')) {
	+ // POSIX PHP functions aren't always available, e.g. on FreeBSD
	+ // In such cases, `id` will probably be available.
	+ return trim(shell_exec('id -u')) === '0';
	+ }
	+
	+ /** @noinspection PhpComposerExtensionStubsInspection */
	+ return posix_geteuid() === 0;
	+ }
	+
	+}
	diff --git a/tests/Reflection/CodeFileTest.php b/tests/Reflection/CodeFileTest.php
	index 22500f2..67df93f 100644
	--- a/tests/Reflection/CodeFileTest.php
	+++ b/tests/Reflection/CodeFileTest.php
	@@ -1,72 +1,85 @@
	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Tests\Reflection;

	+use Keruald\OmniTools\OS\CurrentProcess;
	use Keruald\OmniTools\Reflection\CodeFile;
	use Keruald\OmniTools\Tests\WithData;
	use PHPUnit\Framework\TestCase;

	use Acme\MockLib\Bar; // a mock class in a mock namespace to test include

	class CodeFileTest extends TestCase {

	use WithData;

	/**
	* @var CodeFile
	*/
	private $validCodeFile;

	/**
	* @var CodeFile
	*/
	private $notExistingCodeFile;

	public function setUp () : void {
	$file = $this->getDataPath("MockLib/Bar.php");
	$this->validCodeFile = CodeFile::from($file);

	$this->notExistingCodeFile = CodeFile::from("/notexisting");
	}

	public function testCanInclude () : void {
	$this->assertTrue($this->validCodeFile->canBeIncluded());
	$this->assertFalse($this->notExistingCodeFile->canBeIncluded());
	}

	public function testCanBeIncludedWhenFileModeForbidsReading () : void {
	+ if (CurrentProcess::isPrivileged()) {
	+ $this->markTestSkipped(
	+ "This test requires non-root access to run properly."
	+ );
	+ }
	+
	$file = $this->getNonReadableFile();

	$this->assertFalse(CodeFile::From($file)->canBeIncluded());

	unlink($file);
	}

	public function testTryInclude () : void {
	$this->assertTrue($this->validCodeFile->tryInclude());
	$this->assertTrue(class_exists(Bar::class));

	$this->assertFalse($this->notExistingCodeFile->tryInclude());
	}

	public function testIsReadable () : void {
	$this->assertTrue($this->validCodeFile->isReadable());
	}

	public function testIsReadableWhenFileModeForbidsReading () : void {
	+ if (CurrentProcess::isPrivileged()) {
	+ $this->markTestSkipped(
	+ "This test requires non-root access to run properly."
	+ );
	+ }
	+
	$file = $this->getNonReadableFile();

	$this->assertFalse(CodeFile::From($file)->isReadable());

	unlink($file);
	}

	private function getNonReadableFile () : string {
	$file = tempnam(sys_get_temp_dir(), "testCodeFile");
	chmod($file, 0);

	return $file;
	}

	}

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