python_packaging/test/test_fr02.py

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  34
  35 """Test gmxapi functionality described in roadmap.rst."""
  36
  37 import os
  38 import tempfile
  39
  40 import gmxapi as gmx
  41 import pytest
  42 from gmxapi.version import has_feature
  43
  44
  45 @pytest.mark.skipif(not has_feature('fr2') or has_feature('fr4'),
  46                     reason="Feature level not met or is superseded.")
  47 def test_fr2():
  48     """FR2: Output proxy establishes execution dependency.
  49
  50     Confirm that dependent operations are only executed after their dependencies.
  51
  52     In a sequence of two operations, write a two-line file one line at a time.
  53     Use a user-provided filename as a parameter to each operation.
  54     """
  55     with tempfile.TemporaryDirectory() as directory:
  56         fh, filename = tempfile.mkstemp(dir=directory)
  57         os.close(fh)
  58
  59         line1 = 'first line'
  60         subcommand = ' '.join(['echo', '"{}"'.format(line1), '>>', filename])
  61         commandline = ['-c', subcommand]
  62         filewriter1 = gmx.commandline_operation('bash', arguments=commandline)
  63
  64         line2 = 'second line'
  65         subcommand = ' '.join(['echo', '"{}"'.format(line2), '>>', filename])
  66         commandline = ['-c', subcommand]
  67         filewriter2 = gmx.commandline_operation('bash', arguments=commandline, input=filewriter1)
  68
  69         filewriter2.run()
  70         # Check that the file has the two expected lines
  71         with open(filename, 'r') as fh:
  72             lines = [text.rstrip() for text in fh]
  73         assert len(lines) == 2
  74         assert lines[0] == line1
  75         assert lines[1] == line2