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# assertCount() >[info] ## assertCount($expectedCount, $haystack[, string $message = '']) 当 `$haystack` 中的元素数量不是 `$expectedCount` 时报告错误,错误讯息由 `$message` 指定。 `assertNotCount()` 是与之相反的断言,接受相同的参数。 **Example A.10. assertCount() 的用法** ~~~ <?php class CountTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertCount(0, array('foo')); } } ?> ~~~ ~~~ phpunit CountTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 4.75Mb There was 1 failure: 1) CountTest::testFailure Failed asserting that actual size 1 matches expected size 0. /home/sb/CountTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~