feat: add additional tests

.DS_Store

primingsitepredictor/.idea/.gitignore

...epredictor/.idea/inspectionProfiles/profiles_settings.xml

primingsitepredictor/.idea/misc.xml

primingsitepredictor/.idea/modules.xml

primingsitepredictor/.idea/primingsitepredictor.iml

primingsitepredictor/.idea/vcs.xml

primingsitepredictor/Primer1.fasta

primingsitepredictor/cli.py

primingsitepredictor/createprimer.py

primingsitepredictor/main.py

primingsitepredictor/my_primer.fasta

primingsitepredictor/output_transcripts_df.GTF

primingsitepredictor/output_transcripts_df.txt

primingsitepredictor/postprocessing.py

primingsitepredictor/test/RIBlast output example.txt

primingsitepredictor/test/__init__.py

primingsitepredictor/test/output_transcripts_df.GTF

primingsitepredictor/test/output_transcripts_df.txt

primingsitepredictor/test/primer1.fasta