Testing that when given a comma delimited list of chords, the tranposer transposes each chord correctly.
Testing that space delimiters work when parsing multiple chords.
Testing that tab delimiters work when parsing multiple chords.
Fixup with space test
Testing that when given an array of chords, it transposes each correctly.
Testing that when given an target key, we return that key if it's one of the enharmonic tones of the given key.
Testing that when given an target key, we can only return that key if it's in the "enharmonic zone" - positions 5 to 7 of the circle of 5ths. Otherwise, we should take the default key decided by the transposer.