Setup

  $ pushd "$TESTDIR" > /dev/null
  $ source _setup.sh

This should fail, as probabilistic sampling is explicitly disabled.

  $ ${AUGUR} filter \
  >  --sequences filter/data/sequences.fasta \
  >  --sequence-index filter/data/sequence_index.tsv \
  >  --metadata filter/data/metadata.tsv \
  >  --min-date 2012 \
  >  --group-by country year month \
  >  --subsample-max-sequences 5 \
  >  --subsample-seed 314159 \
  >  --no-probabilistic-sampling \
  >  --output "$TMP/filtered.fasta"
  ERROR: Asked to provide at most 5 sequences, but there are 8 groups.
  [2]
  $ rm -f "$TMP/filtered.fasta"
