Functional Tests Missing File

[jillslind]

When executing the functional tests, check_download.py downloads the genome from google stored files. The genome is unindexed, and there is no code to make a fasta index of the genome. This causes the tests to fail.

Proposed fix (two options):

• Download the GRCh37.fa.fai file from where the GRCh37.fa file is located
• Write code to generate an index for the downloaded file (i.e. samtools faidx GRCh37.fa)