# assertEquals() >[info] ## assertEquals(mixed $expected, mixed $actual[, string $message = '']) 当两个变量 `$expected` 和 `$actual` 不相等时报告错误，错误讯息由 `$message` 指定。 `assertNotEquals()` 是与之相反的断言，接受相同的参数。 `assertAttributeEquals()` 和 `assertAttributeNotEquals()` 是便捷包装(convenience wrapper)，以某个类或对象的某个 `public`、`protected` 或 `private` 属性作为实际值来进行比较。 **Example A.13. assertEquals() 的用法** ~~~ <?php class EqualsTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertEquals(1, 0); } public function testFailure2() { $this->assertEquals('bar', 'baz'); } public function testFailure3() { $this->assertEquals("foo\nbar\nbaz\n", "foo\nbah\nbaz\n"); } } ?> ~~~ ~~~ phpunit EqualsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. FFF Time: 0 seconds, Memory: 5.25Mb There were 3 failures: 1) EqualsTest::testFailure Failed asserting that 0 matches expected 1. /home/sb/EqualsTest.php:6 2) EqualsTest::testFailure2 Failed asserting that two strings are equal. --- Expected +++ Actual @@ @@ -'bar' +'baz' /home/sb/EqualsTest.php:11 3) EqualsTest::testFailure3 Failed asserting that two strings are equal. --- Expected +++ Actual @@ @@ 'foo -bar +bah baz ' /home/sb/EqualsTest.php:16 FAILURES! Tests: 3, Assertions: 3, Failures: 3. ~~~ 如果 `$expected` 和 `$actual` 是某些特定的类型，将使用更加专门的比较方式，参阅下文。 >[info] ## assertEquals(float $expected, float $actual[, string $message = '', float $delta = 0]) 当两个浮点数 `$expected` 和 `$actual` 之间的差值（的绝对值）大于 `$delta` 时报告错误，错误讯息由 `$message` 指定。 关于为什么 `$delta` 参数是必须的，请阅读《[关于浮点运算，每一位计算机科学从业人员都应该知道的事实](http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html)》。 **Example A.14. 将assertEquals()用于浮点数时的用法** ~~~ <?php class EqualsTest extends PHPUnit_Framework_TestCase { public function testSuccess() { $this->assertEquals(1.0, 1.1, '', 0.2); } public function testFailure() { $this->assertEquals(1.0, 1.1); } } ?> ~~~ ~~~ phpunit EqualsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. .F Time: 0 seconds, Memory: 5.75Mb There was 1 failure: 1) EqualsTest::testFailure Failed asserting that 1.1 matches expected 1.0. /home/sb/EqualsTest.php:11 FAILURES! Tests: 2, Assertions: 2, Failures: 1. ~~~ >[info] ## assertEquals(DOMDocument $expected, DOMDocument $actual[, string $message = '']) 当 `$expected` 和 `$actual` 这两个 DOMDocument 对象所表示的 XML 文档对应的无注释规范形式不相同时报告错误，错误讯息由 `$message` 指定。 **Example A.15. assertEquals()应用于 DOMDocument 对象时的用法** ~~~ <?php class EqualsTest extends PHPUnit_Framework_TestCase { public function testFailure() { $expected = new DOMDocument; $expected->loadXML('<foo><bar/></foo>'); $actual = new DOMDocument; $actual->loadXML('<bar><foo/></bar>'); $this->assertEquals($expected, $actual); } } ?> ~~~ ~~~ phpunit EqualsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 5.00Mb There was 1 failure: 1) EqualsTest::testFailure Failed asserting that two DOM documents are equal. --- Expected +++ Actual @@ @@ <?xml version="1.0"?> -<foo> - <bar/> -</foo> +<bar> + <foo/> +</bar> /home/sb/EqualsTest.php:12 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~ >[info] ## assertEquals(object $expected, object $actual[, string $message = '']) 当 `$expected` 和 `$actual` 这两个对象的属性值不相等时报告错误，错误讯息由 `$message` 指定。 **Example A.16. assertEquals()应用于对象时的用法** ~~~ <?php class EqualsTest extends PHPUnit_Framework_TestCase { public function testFailure() { $expected = new stdClass; $expected->foo = 'foo'; $expected->bar = 'bar'; $actual = new stdClass; $actual->foo = 'bar'; $actual->baz = 'bar'; $this->assertEquals($expected, $actual); } } ?> ~~~ ~~~ phpunit EqualsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 5.25Mb There was 1 failure: 1) EqualsTest::testFailure Failed asserting that two objects are equal. --- Expected +++ Actual @@ @@ stdClass Object ( - 'foo' => 'foo' - 'bar' => 'bar' + 'foo' => 'bar' + 'baz' => 'bar' ) /home/sb/EqualsTest.php:14 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~ >[info] ## assertEquals(array $expected, array $actual[, string $message = '']) 当 `$expected` 和 `$actual` 这两个数组不相等时报告错误，错误讯息由 `$message` 指定。 **Example A.17. assertEquals() 应用于数组时的用法** ~~~ <?php class EqualsTest extends PHPUnit_Framework_TestCase { public function testFailure() { $this->assertEquals(array('a', 'b', 'c'), array('a', 'c', 'd')); } } ?> ~~~ ~~~ phpunit EqualsTest PHPUnit 5.0.0 by Sebastian Bergmann and contributors. F Time: 0 seconds, Memory: 5.25Mb There was 1 failure: 1) EqualsTest::testFailure Failed asserting that two arrays are equal. --- Expected +++ Actual @@ @@ Array ( 0 => 'a' - 1 => 'b' - 2 => 'c' + 1 => 'c' + 2 => 'd' ) /home/sb/EqualsTest.php:6 FAILURES! Tests: 1, Assertions: 1, Failures: 1. ~~~