new_contents: from sequana.scripts import taxonomy
  from sequana import sequana_data
  import os
  import pytest
  
  prog = "sequana_taxonomy"
  
  
  @pytest.fixture
  def krakendb():
      # todo
      try:
          taxonomy.main([prog, '--download', 'toydb'])
      except TypeError: # Fails on travis so we download manually (appdirs returns
                        # none instead of the expected user config path
          HOME = os.getenv('HOME')
          from sequana.misc import wget
          baseurl = "https://github.com/sequana/data/raw/master/kraken_toydb/"
          filenames = [
               "database.idx",
               "database.kdb",
               "taxonomy/names.dmp",
               "taxonomy/nodes.dmp"]
          for filename in filenames:
              from easydev import mkdirs
              mkdirs(HOME + os.sep + "database/taxonomy")
              wget(baseurl + os.sep + filename,
                  os.sep.join([HOME, "database", filename]))
      except SystemExit:
          pass
  
  
  def test_analysis(krakendb):
      file1 = sequana_data("Hm2_GTGAAA_L005_R1_001.fastq.gz")
      file2 = sequana_data("Hm2_GTGAAA_L005_R2_001.fastq.gz")
  
      # Test that database must be provided
      try:
          df = taxonomy.main([prog, '--file1', file1])
          assert False
      except:
          assert True
  
      from tempfile import TemporaryDirectory
      directory = TemporaryDirectory()
  
      # If on travis and we could not load the database, use the local one
      # that must have been downloaded
      try:
          df = taxonomy.main([prog, '--file1', file1, "--database", "toydb",
              "--file2", file2, "--level", "INFO", "--output-directory",
              directory.name, "--thread", "1"])
      except:
          # For travis test
          HOME = os.getenv('HOME')
          database = os.sep.join([HOME, '.config', 'sequana', 'kraken_toydb'])
          df = taxonomy.main([prog, '--file1', file1, "--database", database,
              "--file2", file2,  "--output-directory",
              directory.name, "--thread", "1"])
      from sequana import logger
      logger.info(directory.name)
  
  def test_help():
      try:
          taxonomy.main([prog, '--help', '1>/tmp/out', '2>/tmp/err'])
          assert False
      except SystemExit:
          pass
      else:
          raise Exception
  
  def test_wrong_db():
      try:
          df = taxonomy.main([prog, "--database", "dummy"])
          assert False
      except:
          assert True
  
subject: add test