[tests] test bundle against actual symfony app

[jrushlow]

• allows us to test the bundle in a Symfony "web app"
• borrows concepts from MakerBundle. One day we'll also test against the generated output of make:reset-password instead of using fixtures.
• later, we'll improve caching of the "app" so it can be reused for multiple tests. This isn't being done now as there are more pressing issues at hand...
• the fixtures included were generated by make:reset-password with slight modifications

[bocharsky-bw]

Looks good to me! The only concern is about keeping this test code in fixtures with the latest changes in recipes in sync.

[jrushlow]

The only concern is about keeping this test code in fixtures with the latest changes in recipes in sync.

Agree'd - ideally we'd run make:reset-password when bootstrapping the test. But, make:reset-password requires user input. The only way to do that programmatically is via stream - like we do in MakerBundle https://github.com/symfony/maker-bundle/blob/main/src/Test/MakerTestEnvironment.php#L333

We could re-create that code here in reset-password, but I think a better option would be to create some sort of test-helpers repo that has all of that included -> then use that here to call make:reset-password. This will also be needed in VerifyEmailBundle to do "app" testing against make:registration.

I'm going to create an issue for visibility, and merge this for the time being. But ultimately yes, I manually updating fixtures is not a good solution in the log term..