Consider the following scenario (this is not production code):
class MyClass {
public function myMethod() {
// create a directory
$path = sys_get_temp_dir() . '/' . md5(rand());
if(!mkdir($path)) {
throw new Exception("mkdir() failed.");
}
// create a file in that folder
$myFile = fopen("$path/myFile.txt", "w");
if(!$myFile) {
throw new Exception("Cannot open file handle.");
}
}
}
Right, so what's the problem? Code coverage reports that this line is not covered:
throw new Exception("Cannot open file handle.");
Which is correct, but since I'm creating the folder above logically it would seem impossible for the fopen() to fail (except maybe in extreme circumstances, like disk at 100 %).
I could ignore the code from code coverage but thats kind of cheating. Is there any way I can mock the file system so that it can recognise myFile.txt and mock the file system unable to create the file?
vfsStream is a stream wrapper for a virtual filesystem that is useful in unit tests to mock the real filesystem. You can install it from composer.
More Info at: