Enforce error_reporting level for phpunit suite

[acoulton]

Many of the unit tests rely on phpunit's error handler throwing exceptions from various trigger_error calls. This error handler only fires for errors matching the system error_reporting configuration.

If the user's local error_reporting is configured too low then the test suite will produce a number of false failures and false positives - expected exceptions will not be thrown and code that is expected to abort will continue execution with the error message silenced. This caught me out when contributing #116

Add a custom bootstrap to ensure that PHP is configured to use E_ALL | E_STRICT for the duration of the test run regardless of the system default setting.

[acoulton]

For example, on PHP 5.5.9 running the suite with error_reporting = 0 gives the following failures:

There were 9 failures:

1) org\bovigo\vfs\PermissionsTestCase::touchOnNonWriteableDirectoryTriggersError
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

2) org\bovigo\vfs\vfsStreamWrapperMkDirTestCase::mkDirShouldNotOverwriteExistingDirectoriesAndTriggerE_USER_WARNING
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

3) org\bovigo\vfs\vfsStreamWrapperMkDirTestCase::mkDirShouldNotOverwriteExistingFilesAndTriggerE_USER_WARNING
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

4) org\bovigo\vfs\vfsStreamWrapperMkDirTestCase::unlinkCanNotRemoveEmptyDirectory
Failed asserting that false is true.

/vagrant/vfsstream/src/test/php/org/bovigo/vfs/vfsStreamWrapperDirTestCase.php:428

5) org\bovigo\vfs\vfsStreamWrapperSelectStreamTestCase::selectStream
Failed asserting that exception of type "\PHPUnit_Framework_Error" is thrown.

6) org\bovigo\vfs\vfsStreamWrapperTestCase::renameFileIntoFile
Failed asserting that exception of type "PHPUnit_Framework_ExpectationFailedException" matches expected exception "PHPUnit_Framework_Error". Message was: "Failed asserting that false is true." [...etc]

7) org\bovigo\vfs\vfsStreamWrapperTestCase::renameOnSourceFileNotFound
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

8) org\bovigo\vfs\vfsStreamWrapperTestCase::renameOnDestinationDirectoryFileNotFound
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

9) org\bovigo\vfs\vfsStreamWrapperTestCase::openFileWithoutDirectory
Failed asserting that exception of type "PHPUnit_Framework_Error" is thrown.

FAILURES!
Tests: 385, Assertions: 1327, Failures: 9, Skipped: 5.

I found it wasn't immediately obvious why they were failing (my error_reporting was only 0 due to a misconfiguration in php.ini so it didn't occur at first). This PR ensures the suite behaves as expected regardless of system configuration.

Again, it seems to have reduced coverage although the travis build is green - I'm not certain why.

[mikey179]

Thanks for the report, some things only become obvious when other people run the code. I added an additional ini setting in the phpunit.xml.dist file, this saves us from the additional bootstrap file. 😃

[acoulton]

@mikey179 thanks - I'd not thought of that (not an expert on the phpunit.xml options), it's a much better solution. :)