Fix broken tests and include temp pregap checks

[ FIXED ]  Broken tests checking whether the pregap is greater in
           length than 2 seconds (as a result of variable name change)
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[ ADDED ]  Temporary checks for pregap lengths greater in length than
           2 seconds.  If any pregaps are found to match this check, a
           text file will be created in the user's HOME directory,
           displaying which file has the pregap included in the audio