Add integration test for the info subcommand with plain style

[sbesson]

See #31 (comment)

• 49b8cad adds a new integration test covering the --style plain output of the info subcommand including some assertion that there is no printing error in the stderr
• ff001f6 fixes the printing error

[dominikl]

Looks good 👍
The 'print' error is gone and test passes.

Not a matter of this PR, but I was wondering what the hard coded rdefv1 in the plain output stands for. Should that not rather be the version of the rdef specification (like in the yaml output etc.)?

[sbesson]

I think you are correct. The plain representation is probably now superseded by the more formal JSON/YAML output but f5f2ea1 updates code and test to reflect the value of SPEC_VERSION

[dominikl]

Thanks. Looks like I missed the __str__ method when I added SPEC_VERSION variable.
I think it's good to merge 👍 But can also do another quick test tomorrow, when it's in the snoopy repo.

[sbesson]

Happy to wait for a final sign-off before merging this.

[dominikl]

Tested again today, looks fine 👍