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# assertFileExists() >[info] ## assertFileExists(string $filename[, string $message = '']) 当 `$filename` 所指定的文件不存在时报告错误,错误讯息由 `$message` 指定。 `assertFileNotExists()` 是与之相反的断言,接受相同的参数。 **Example A.20. assertFileExists() 的用法** ~~~ <?php class FileExistsTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertFileExists('/path/to/file'); } } ?> ~~~ ~~~ phpunit FileExistsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 4.75Mb There was 1 failure: 1) FileExistsTest::testFailure Failed asserting that file "/path/to/file" exists. /home/sb/FileExistsTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~