testing

DifferentialDiffTestCase.php
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			<?php

			final class DifferentialDiffTestCase extends ArcanistPhutilTestCase {

			public function testDetectCopiedCode() {
			$root = dirname(__FILE__).'/diff/';
			$parser = new ArcanistDiffParser();

			$diff = DifferentialDiff::newFromRawChanges(
			PhabricatorUser::getOmnipotentUser(),
			$parser->parseDiff(Filesystem::readFile($root.'lint_engine.diff')));
			$copies = idx(head($diff->getChangesets())->getMetadata(), 'copy:lines');

			$this->assertEqual(
			array_combine(range(237, 252), range(167, 182)),
			ipull($copies, 1));
			}

			public function testDetectSlowCopiedCode() {
			// This tests that the detector has a reasonable runtime when a diff
			// contains a very large number of identical lines. See T5041.

			$parser = new ArcanistDiffParser();

			$line = str_repeat('x', 60);
			$oline = '-'.$line."\n";
			$nline = '+'.$line."\n";

			$n = 1000;
			$oblock = str_repeat($oline, $n);
			$nblock = str_repeat($nline, $n);

			$raw_diff = <<<EODIFF
			diff --git a/dst b/dst
			new file mode 100644
			index 0000000..1234567
			--- /dev/null
			+++ b/dst
			@@ -0,0 +1,{$n} @@
			{$nblock}
			diff --git a/src b/src
			deleted file mode 100644
			index 123457..0000000
			--- a/src
			+++ /dev/null
			@@ -1,{$n} +0,0 @@
			{$oblock}
			EODIFF;

			$diff = DifferentialDiff::newFromRawChanges(
			PhabricatorUser::getOmnipotentUser(),
			$parser->parseDiff($raw_diff));

			$this->assertTrue(true);
			}


			}