Here is the output with .biom as the suffix. 

09:40:57 tests@testcoderemove$ python test_beta_diversity.py 
...EEEEEE
======================================================================
ERROR: test_single_file_beta (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 251, in test_single_file_beta
    self.single_file_beta(l19_otu_table, l19_tree)
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmppJJ3in/abund_jaccard_tmpy3RL1F.biom'

======================================================================
ERROR: test_single_file_beta_metric_list (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 254, in test_single_file_beta_metric_list
    self.single_file_beta(l19_otu_table, l19_tree, use_metric_list=True)
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmpO0c_yE/abund_jaccard_tmpv9JEHa.biom'

======================================================================
ERROR: test_single_file_beta_missin_metric_list (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 262, in test_single_file_beta_missin_metric_list
    missing_sams=['M'], use_metric_list=True)
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmpELNrTb/abund_jaccard_tmpai3G1w.biom'

======================================================================
ERROR: test_single_file_beta_missing (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 258, in test_single_file_beta_missing
    missing_sams=['M'])
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmpc5P4j3/abund_jaccard_tmpmF15Jb.biom'

======================================================================
ERROR: test_single_object_beta (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 359, in test_single_object_beta
    self.single_file_beta(l19_otu_table, l19_tree)
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmp9iyP0N/abund_jaccard_tmpKFwuU0.biom'

======================================================================
ERROR: test_single_object_beta_missing (__main__.BetaDiversityCalcTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_beta_diversity.py", line 363, in test_single_object_beta_missing
    missing_sams=['M'])
  File "test_beta_diversity.py", line 178, in single_file_beta
    metric + '_' + in_fname))
IOError: [Errno 2] No such file or directory: '/tmp/tmpjuwgCk/abund_jaccard_tmpFq9oFF.biom'

----------------------------------------------------------------------
Ran 9 tests in 0.183s

FAILED (errors=6)