Add fixture for invalid head version format

[pwinckles]

Fixture for invalid head version number

[zimeon]

I'm flagging this a "request changes" because I think we need to talk about expectations here. My sense is that any validation should short circuit here and not look into versions with invalid version numbers 1. Might also have implications on some implementation note about validation practices.

[pwinckles]

@zimeon What's the path forward on this one?

[zimeon]

What do you think the key error condition for this fixture is? I find it hard to decide but I'm pretty sure that head matching the one "version-number" is really a side issue to the fact the there are no valid versions in the root inventory. There are also no valid version directories if one started from there. I don't see E011 as a likely error code, could imagine E008 or E009?

[pwinckles]

@zimeon I don't think there is a good code. See OCFL/spec#532

[zimeon]

Since in v1.0 we do not have a good error code, I propose that we just got with the catchall E001. What do you think @pwinckles ?

[pwinckles]

Works for me.

I renamed the fixture to E001_invalid_version_format