phpunit with output buffering

Question

I'm trying to integrate PHPunit into a big project, everything seems fine except it seems that all methods that rely on ob_start() will result in a risky test.

Reading online, it seems risky tests are such tests which execute code not covered by the testing method. However, I haven't used the @covers annotation at all, And this happens only on ob_start().

So a few questions :

Is it possible to resolve this issue?
Is there something inherently wrong with ob_start when it comes to testing?
Is there a way around it?(if not possible to resolve it).

The use case is using a framework who's views are returned(instead of sent to the browser), Codeigniter comes as a classic example, where you can return views. Returning views depend on ob_start(). Thanks alot!

I'm not using an XML, rather an inline invocation, I'm not using the --strict flag. when adding --strict(even though it's deprecated), more of the tests are now flagged as risky — Patrick
– Patrick, Commented Mar 27, 2015 at 8:50

Patrick · Accepted Answer · 2015-03-27 20:52:16Z

4

The solution is two fold, as it revolves around two issues I had.

Regarding the specific problem, using views in a framework(codeigniter), I simply used a mock for the loader, so I implemented an empty function that doesn't actually load and outputs html.
Regarding the actual issue I had with PHPunit's behavior, it seems that PHPunit(4.5) will assume a test is Risky if using ob_start and ob_clean, However when using ob_get_clean the testing works as expected. I'm not sure why as I didn't dive into the code itself, but that solved it for me

answered Mar 27, 2015 at 20:52

Patrick

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3 Comments

Andrew Smith Over a year ago

// Fetch the buffered output then ob_get_clean .... thank you! <br/> $out = output(); $out = ob_get_clean();

Ricky Boyce Over a year ago

Thanks for point two, I'm creating a prettier var_dump function :)

MikeT Over a year ago

its a risky test because flush leave the output in the buffer so the next test would start with a dirty buffer, ob_get_clean wipes the buffer out so nothing left to interfere with other tests

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