human
Solve the following python programming problem given the following code:
@pytest.fixture(scope='session')
def mock_svn_repository():
assistant
#Here is the Python code you requested.

    """Creates a very simple svn repository with two commits.
    """
    svn = spack.util.executable.which('svn', required=True)
    svnadmin = spack.util.executable.which('svnadmin', required=True)
    stage = spack.stage.Stage('mock-svn-stage')
    tmpdir = py.path.local(stage.path)
    repo_name = 'mock-svn-repo'
    tmpdir.ensure(repo_name, dir=True)
    repodir = tmpdir.join(repo_name)
    url = ('file://' + str(repodir))
    current = repodir.chdir()
    svnadmin('create', '--pre-1.5-compatible', str(repodir))
    r0_file = 'r0_file'
    tmpdir.ensure('tmp-path', r0_file)
    svn('import', str(tmpdir.join('tmp-path')), url, '-m', 'Initial    import    r0')
    shutil.rmtree(str(tmpdir.join('tmp-path')))
    r1_file = 'r1_file'
    svn('checkout', url, str(tmpdir.join('tmp-path')))
    tmpdir.ensure('tmp-path', r1_file)
    tmpdir.join('tmp-path').chdir()
    svn('add', str(tmpdir.ensure('tmp-path', r1_file)))
    svn('ci', '-m', 'second    revision    r1')
    repodir.chdir()
    shutil.rmtree(str(tmpdir.join('tmp-path')))
    r0 = '1'
    r1 = '2'
    Bunch = spack.util.pattern.Bunch
    checks = {'default': Bunch(revision=r1, file=r1_file, args={'svn': url}), 'rev0': Bunch(revision=r0, file=r0_file, args={'svn': url, 'revision': r0})}
    def get_rev():
        output = svn('info', output=str)
        assert ('Revision' in output)
        for line in output.split('\n'):
            match = re.match('Revision:    (\\d+)', line)
            if match:
                return match.group(1)
    t = Bunch(checks=checks, url=url, hash=get_rev, path=str(repodir))
    (yield t)
    current.chdir()