File_get_contents not evaluating to false when file does not exist - php

Question

I'm trying to test an exception in my code.
public function testGetFileThrowsException(){
$this->expectException(FileNotFoundException::class);
$file = "db.json";
$this->review->getData($file);
}
The "db.json" file doesn't exist. My goal is tp have the getData() file to throw the FileNotFoundException. Here is the getData() code:
public function getData($path){
if(file_get_contents($path) === false){
throw new FileNotFoundException;
}
return $file;
}
The problem is that instead of evaluating to False and throw the exception, the file_get_contents function returns:
1) CompanyReviewTest::testGetFileThrowsException
file_get_contents(db.json): failed to open stream: No such file or directory
So the test doesn't run successfully. Any ideas on why does this happen?

Answer 1

file_get_contents() generates an E_WARNING level error (failed to open stream) which is what you'll want to suppress as you're already handling it with your exception class.
You can suppress this warning by adding PHP's error control operator # in front of file_get_contents(), example:
<?php
$path = 'test.php';
if (#file_get_contents($path) === false) {
echo 'false';
die();
}
echo 'true';
?>
The above echoes false, without the # operator it returns both the E_WARNING and the echoed false. It may be the case that the warning error is interfering with your throw function, but without seeing the code for that it's hard to say.

Answer 2

You have 2 solution the poor one is to hide the error like that
public function getData($path){
if(#file_get_contents($path) === false){
throw new FileNotFoundException;
}
return $file;
}
Or check maybe if the file exist (better solution i guess)
public function getData($path){
if(file_exists($path) === false){
throw new FileNotFoundException;
}
return $file;
}