Unit tests and integration tests

[judgej]

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[judgej]

I tried making a start on unit tests, but ran out of time. I'm no expert on mocking the Microsoft Azure API library, and got a bit stuck.

However, there are some integration tests now that will run against a live Azure file share. They test real file creation/deletion/copying/renaming/etc against three different base directories (non, a single level base and a two-level base).

To run the tests, after a composer update, set the environment variables listed in .env.example, then run:

vendor/bin/phpunit --testsuite=flysystem-azure-live-tests

To tidy up the files and directories it creates in the testing process, run:

vendor/bin/phpunit --testsuite=flysystem-azure-live-tests --filter testClearState

Apart from the testClearState, which is run once at the start of all tests, the tests are all statefull - each sets up the filesystem for the next test. This means you cannot run other tests in isolation.