PhutilErrorHandlerTestCase.php
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	<?php

	final class PhutilErrorHandlerTestCase extends PhutilTestCase {

	public function testProxyException() {
	$a = new Exception('a');
	$b = new PhutilProxyException('b', $a);
	$c = new PhutilProxyException('c', $b);

	$this->assertEqual($a, $b->getPrevious());
	$this->assertEqual($a, PhutilErrorHandler::getRootException($b));
	$this->assertEqual($a, PhutilErrorHandler::getPreviousException($b));

	$this->assertEqual($a, PhutilErrorHandler::getRootException($c));
	$this->assertEqual($b, PhutilErrorHandler::getPreviousException($c));
	}

	public function testSilenceHandler() {
	// Errors should normally be logged.
	$this->assertTrue(strlen($this->emitError()) > 0);

	// The "@" operator should silence errors.
	$this->assertTrue(@strlen($this->emitError()) === 0);
	}

	private function emitError() {
	$temporary_log = new TempFile();

	$old_log = ini_get('error_log');
	ini_set('error_log', (string)$temporary_log);

	trigger_error(pht('(A synthetic error emitted during a unit test.)'));

	ini_set('error_log', $old_log);
	return Filesystem::readFile($temporary_log);
	}


	}