Add a sample sniff test for new Mothur datatype.

The existing sniffer tests with the mothur stuff tests the sniffers in isolation - this is more of an integration test that tests the sample datatype configuration for the newly added mothur stuff.

Author: jmchilton

lib/galaxy/datatypes/sniff.py

@@ -343,6 +343,9 @@ def guess_ext( fname, sniff_order, is_multi_byte=False ):
     >>> fname = get_test_fname('5e5z.pdb')
     >>> guess_ext(fname, sniff_order)
     'pdb'
+    >>> fname = get_test_fname('mothur_datatypetest_true.mothur.otu')
+    >>> guess_ext(fname, sniff_order)
+    'mothur.otu'
     """
     for datatype in sniff_order:
         """