Phpunit图像下载测试 [英] Phpunit image download test

问题描述

我正在用php编写的图像下载服务编写测试用例。我们正在使用phpunit。如何检查检索到的二进制数据是否为图像？

I'm writing test case to image downloading service written in php. We're using phpunit. How can I check if retrieved binary data is an image?

推荐答案

使用 exif_imagetype （参见手册）很不错，但确实需要你本地磁盘上的文件。如果您不介意对某些幻数进行硬编码，可以直接检查图像类型，请参阅下一个示例中的 testFetchWithoutSaving ：

Using exif_imagetype (see manual) is nice, but does require you have to the file on your local disk. If you don't mind hard-coding some magic numbers, you could check for the image type directly, see testFetchWithoutSaving in the next example:

class ImageTest extends PHPUnit_Framework_TestCase
{

/**
* @see http://stackoverflow.com/a/676975/841830
*/
public function testFetchWithoutSaving(){
    $s=file_get_contents("https://www.google.com/images/srpr/logo3w.png");
    $this->assertEquals("\x89PNG\x0d\x0a\x1a\x0a",substr($s,0,8));

    $s=file_get_contents("https://www.google.com/");
    $this->assertEquals("\x89PNG\x0d\x0a\x1a\x0a",substr($s,0,8),"Fails: first 8 bytes are actually '<!doctyp'");
    }

/**
* @see http://php.net/manual/en/function.exif-imagetype.php
*/
public function testFetchWithTempFile(){
    $s=file_get_contents("https://www.google.com/images/srpr/logo3w.png");
    $tempFilename="/tmp/phpunit.testImage.testFetchWithTempFile";
    file_put_contents($tempFilename,$s);
    $type=exif_imagetype($tempFilename);
    unlink($tempFilename);
    $this->assertTrue($type!==false);   //Any recognized image type
    $this->assertEquals(IMAGETYPE_PNG,$type);   //A specific image type
    }

}

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