Black doesn't split the line with string and format()

[jaklan]

Operating system: Ubuntu 16.04
Python version: 3.6.6
Black version: 18.9b0
Does also happen on master: yes

Length limit: 80

Before Black:

logging.info("Evaluating the model with {} of the supplied data held out for tests ({}).".format(sup_opts["test_split"], len(test)))

After Black:

logging.info(
    "Evaluating the model with {} of the supplied data held out for tests ({}).".format(
        sup_opts["test_split"], len(test)
    )
)

The line with string should be splitted, because it exceeds the line length limit, but it's not. The same effect is for different settings, e.g. 60 chars, 50 chars.

[JelleZijlstra]

This seems the same as #182.

[wbolster]

this should be closed as a dup of #182 indeed