为什么对于明显相同的字符串，PHPUnit 会给我一个assertEquals 失败？
以下脚本既演示并记录了问题（在标题注释中），即我无法检测“预期”和“实际”字符串之间的任何差异：
<?php
/*
$ phpunit MyTest.php
PHPUnit 3.4.0 by Sebastian Bergmann.
F
Time: 0 seconds
There was 1 failure:
1) MyTest::test_print_r
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}
+O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}
.../MyTest.php:41
.../bin/phpunit:54
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
*/
class MyClass {
static protected $var2;
private $var3;
public $var1;
public function foo($item) {
echo $item . "\n";
}
}
class MyTest extends PHPUnit_Framework_TestCase {
function test_print_r() {
$m = new MyClass();
$this->assertEquals(trim('O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}'), trim(serialize($m)));
}
}
The following script both demonstrates and documents (in the header comment) the issue, namely that I am unable to detect any difference between the "expected" and "actual" strings:
<?php
/*
$ phpunit MyTest.php
PHPUnit 3.4.0 by Sebastian Bergmann.
F
Time: 0 seconds
There was 1 failure:
1) MyTest::test_print_r
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}
+O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}
.../MyTest.php:41
.../bin/phpunit:54
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
*/
class MyClass {
static protected $var2;
private $var3;
public $var1;
public function foo($item) {
echo $item . "\n";
}
}
class MyTest extends PHPUnit_Framework_TestCase {
function test_print_r() {
$m = new MyClass();
$this->assertEquals(trim('O:7:"MyClass":2:{s:13:"MyClassvar3";N;s:4:"var1";N;}'), trim(serialize($m)));
}
}
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您没有看到问题，因为您使用的是相当旧的 PHPUnit 版本。当前版本是
3.6.5，如果可以的话，您应该升级。PHPUnit>>当字符串包含不可打印字符时，3.6 将向您显示不同的差异。就像这里的情况一样。
这是使用更新版本的输出。失败原因的解释如下：
解释
序列化的 php 字符串包含 NULL BYTES 来表示私有和受保护的类变量。
字符串
"MyClassvar3"实际上是"\0MyClass\0var3"。修复断言：
使用此断言将导致测试正常工作。
You don't see the Problem because you are using a quite old PHPUnit Version. The current version is
3.6.5and if you can you should upgrade.PHPUnit > 3.6 will show a differnt diff to you when the string contains unprintable characters. As is the case here.
Here is the output using a more current Version. The explanation on why it fails is below:
Explanation
A serialized php string contains
NULL BYTESto denote private and protected class variables.The string
"MyClassvar3"is really"\0MyClass\0var3".To fix the assertion:
Using this will result in the test working.