[Feature]: Increase testing code coverage

[rly]

What would you like to see added to HDMF?

• @oruebel will look at the backends module
• @stephprince will look at the common module
• @rly will look at the build and spec modules

And then we will re-evaluate.

What solution would you like?

Increase coverage to 95%

Do you have any interest in helping implement the feature?

Yes.

[rly]

Goal: accomplish this by Oct 20