'os_version() returns an OS version for a FLocker version.'

def test_os_version(self):

    version = '1.2.3'
    rpm_version = make_rpm_version(version)
    expected = ('%s-%s' % (rpm_version.version, rpm_version.release))
    package_source = PackageSource(version=version)
    self.assertEqual(expected, package_source.os_version())
