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# Scenario step implementations

This chapter contains implementations of the scenario steps, so that
this manual may be used as an automated test suite for obbench. See
[yarn][] documentation for understanding this.

We use Python to implement the steps. This requires at least
version 0.19 of yarn.

## Create benchmark specification file

    IMPLEMENTS GIVEN a benchmark specification file (\S+) containing (.*)
    import os
    filename = os.environ['MATCH_1']
    config_text = os.environ['MATCH_2']
    with open(filename, 'w') as f:
        f.write(config_text)

## Create a local configuration file

    IMPLEMENTS GIVEN an obbench configuration file (\S+) containing (.*)
    import os
    filename = os.environ['MATCH_1']
    config_text = os.environ['MATCH_2']
    with open(filename, 'w') as f:
        f.write(config_text)

## Run obbench, with arguments

    IMPLEMENTS WHEN I run obbench (.*)
    import os
    import cliapp
    arg_string = os.environ['MATCH_1']
    args = arg_string.split()
    srcdir = os.environ['SRCDIR']
    obbench = os.path.join(srcdir, 'obbench')
    cliapp.runcmd([obbench] + args, stdout=None, stderr=None)

### Check directory existence

    IMPLEMENTS THEN directory (\S+) exists
    import os
    dirname = os.environ['MATCH_1']
    assert os.path.isdir(dirname), "dir {} doesn't exist".format(dirname)

### Check file existence

    IMPLEMENTS THEN file (\S+) exists
    import os
    filename = os.environ['MATCH_1']
    assert os.path.isfile(filename), "file {} doesn't exist".format(filename)

### Check glob matching

    IMPLEMENTS THEN files matching (\S+) exist
    import glob, os
    pattern = os.environ['MATCH_1']
    assert glob.glob(pattern) != [], "glob {} doesn't match".format(pattern)