错误相关信息的输出
最后更新于：2022-04-01 03:44:37
# 错误相关信息的输出
当有测试失败时，PHPUnit 全力提供尽可能多的有助于找出问题所在的上下文信息。
**Example 2.17. 数组比较失败时生成的错误相关信息输出**
~~~
<?php
class ArrayDiffTest extends PHPUnit_Framework_TestCase
{
public function testEquality() {
$this->assertEquals(
array(1,2,3 ,4,5,6),
array(1,2,33,4,5,6)
);
}
}
?>
~~~
~~~
phpunit ArrayDiffTest
PHPUnit 5.0.0 by Sebastian Bergmann and contributors.
F
Time: 0 seconds, Memory: 5.25Mb
There was 1 failure:
1) ArrayDiffTest::testEquality
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
Array (
0 => 1
1 => 2
- 2 => 3
+ 2 => 33
3 => 4
4 => 5
5 => 6
)
/home/sb/ArrayDiffTest.php:7
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
~~~
在这个例子中，数组中只有一个值不同，但其他值也都同时显示出来，以提供关于错误发生的位置的上下文信息。
当生成的输出很长而难以阅读时，PHPUnit 将对其进行分割，并在每个差异附近提供少数几行上下文信息。
**Example 2.18. 长数组比较失败时生成的错误相关信息输出**
~~~
<?php
class LongArrayDiffTest extends PHPUnit_Framework_TestCase
{
public function testEquality() {
$this->assertEquals(
array(0,0,0,0,0,0,0,0,0,0,0,0,1,2,3 ,4,5,6),
array(0,0,0,0,0,0,0,0,0,0,0,0,1,2,33,4,5,6)
);
}
}
?>
~~~
~~~
phpunit LongArrayDiffTest
PHPUnit 5.0.0 by Sebastian Bergmann and contributors.
F
Time: 0 seconds, Memory: 5.25Mb
There was 1 failure:
1) LongArrayDiffTest::testEquality
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
13 => 2
- 14 => 3
+ 14 => 33
15 => 4
16 => 5
17 => 6
)
/home/sb/LongArrayDiffTest.php:7
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
~~~
## 边缘情况
当比较失败时，PHPUnit 为输入值建立文本表示，然后以此进行对比。这种实现导致在差异指示中显示出来的问题可能比实际上存在的多。
这种情况只出现在对数组或者对象使用 assertEquals 或其他“弱”比较函数时。
**Example 2.19. 当使用弱比较时在生成的差异结果中出现的边缘情况**
~~~
<?php
class ArrayWeakComparisonTest extends PHPUnit_Framework_TestCase
{
public function testEquality() {
$this->assertEquals(
array(1 ,2,3 ,4,5,6),
array('1',2,33,4,5,6)
);
}
}
?>
~~~
~~~
phpunit ArrayWeakComparisonTest
PHPUnit 5.0.0 by Sebastian Bergmann and contributors.
F
Time: 0 seconds, Memory: 5.25Mb
There was 1 failure:
1) ArrayWeakComparisonTest::testEquality
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
Array (
- 0 => 1
+ 0 => '1'
1 => 2
- 2 => 3
+ 2 => 33
3 => 4
4 => 5
5 => 6
)
/home/sb/ArrayWeakComparisonTest.php:7
FAILURES!
Tests: 1, Assertions: 1, Failures: 1.
~~~
在这个例子中，第一个索引项中的 `1` and `'1'` 在报告中被视为不同，虽然 assertEquals 认为这两个值是匹配的。