note 110356 added to language.exceptions.extending
| From: | michaelrfairhurst at gmail dot com | Date: | Mon, 15 Oct 2012 04:56:00 +0000 |
| Subject: | note 110356 added to language.exceptions.extending | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-191295@lists.php.net to get a copy of this message | ||
Custom exception classes can allow you to write tests that prove your exceptions
are meaningful. Usually testing exceptions, you either assert the message equals
something in which case you can't change the message format without refactoring,
or not make any assertions at all in which case you can get misleading messages
later down the line. Especially if your $e->getMessage is something complicated
like a var_dump'ed context array.
The solution is to abstract the error information from the Exception class into
properties that can be tested everywhere except the one test for your formatting.
<?php
class TestableException extends Exception {
private $property;
function __construct($property) {
$this->property = $property;
parent::__construct($this->format($property));
}
function format($property) {
return "I have formatted: " . $property . "!!";
}
function getProperty() {
return $this->property;
}
}
function testSomethingThrowsTestableException() {
try {
throw new TestableException('Property');
} Catch (TestableException $e) {
$this->assertEquals('Property', $e->getProperty());
}
}
function testExceptionFormattingOnlyOnce() {
$e = new TestableException;
$this->assertEquals('I have formatted: properly for the only required test!!',
$e->format('properly for the only required test')
);
}
?>
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Probable Submitter: 70.96.69.178
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Manual Page -- http://www.php.net/manual/en/language.exceptions.extending.php
Edit -- https://master.php.net/note/edit/110356
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Del: useless -- https://master.php.net/note/delete/110356/useless
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Del: spam -- https://master.php.net/note/delete/110356/spam
Del: non-english -- https://master.php.net/note/delete/110356/non-english
Del: in docs -- https://master.php.net/note/delete/110356/in+docs
Del: other reasons-- https://master.php.net/note/delete/110356
Reject -- https://master.php.net/note/reject/110356
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