How to manipulate the application configs for controller tests? - phpunit

Question

I'm writing functional / controller tests for a ZF3 application (driven by PHPUnit and zendframework/zend-test). Like this:
public function testWhatEver()
{
$this->dispatch('/');
$this->assertResponseStatusCode(Response::STATUS_CODE_200);
}
It's working pretty well. But now I got a case, where I need to test the application with multiple mutually exclusive configs.
E.g., the case "authentication": The application provides multiple authentication methods (let's say: AuthA, AuthB,AuthC). (That is configurable via setting of the auth.type's value in the config file.) I want to test each of them. That means, it's not enough to have special test configs in the /config/autoload/test/*{local|global}.php. I need to be able to manipulate them for every test (before I call the dispatch(...) method).
How to manipulate the application configs for / from controller tests (on the fly)?
If no better solution can be found, a possible workaround might be to edit the config file (by using file_put_contents(...) or something like this) before every test. But it's a bit ugly (and slow).

Answer 1

In general I see no really nice solution for this problem. But there some more or less acceptable workaround:
Workaround 1: manipulating the according config file for every test
$configs = file_get_contents(...)
searchByRegexAndManipulateConfigs(...)
file_put_contents(...)
It's much effort and would make the testing slower (due to reading from / writing to the filesystem).
Workaround 2: simple files with only one config value
We can create files like config.auth.type.php or config.auth.type.txt (one per config value t keep the file really simple) and to use inclue or file_get_contents(...) call as value in the config. The the value in the file needs to be manipulated before the test execution.
It's a bit less effort (we don't need to write complex RegEx), but might make the test considerably slower, since every application request would start by reading an additional file.
Workaround 3: passing configs values through GLOBALS
It's the simplest and fastest variant. We just save the needed value into a global variable and read it in the config (file's) array. After the test we remove the variable:
AuthBTest
...
protected function setUp() // or setUpBeforeClass()
{
parent::setUp();
$GLOBALS['appTestConfigs']['auth.type'] = 'AuthA';
}
protected function tearDown() // or tearDownAfterClass()
{
parent::tearDown();
unset($GLOBALS['appTestConfigs']);
}
...
/config/autoload/test/local.php
return [
'auth' => [
'type' => isset($GLOBALS['appTestConfigs']['auth.type']) ? $GLOBALS['appTestConfigs']['auth.type'] : 'AuthA',
],
];