import pytest
import parse_vcf as pv



def test_openfile():
    assert pv.openfile('test_parse_vcf.py')[0] == True

import pytest
import parse_vcf as pv



def test_openfile():
    # The real input file is called: 001.vcfmod 
    assert pv.openfile('001.vcfmod')[0] == True

Use one of the real data files in test
Use one of the real data files in test
