Source code for openmdao.util.testutil

"""Utilities for the OpenMDAO test process."""

import os.path
import sys
from math import isnan

[docs]def assertRaisesError(test_case_instance, code, err_type, err_msg): """ Determine that `code` raises `err_type` with `err_msg`. """ try: eval(code) except err_type, err: test_case_instance.assertEqual(str(err), err_msg) else: test_case_instance.fail("Expecting %s" % err_type)
[docs]def assert_raises(test_case, code, globals, locals, exception, msg, use_exec=False): """ Determine that `code` raises `exception` with `msg`. test_case: :class:`unittest.TestCase` TestCase instance used for assertions. code: string Statement to be executed. globals, locals: dict Arguments for :meth:`eval`. exception: Exception Exception that should be raised. msg: string Expected message from exception. use_exec: bool If True, then evaluate `code` with :func:`exec` rather than :func:`eval`. This is necessary for testing statements that are not expressions. """ try: if use_exec: exec code in globals, locals else: eval(code, globals, locals) except exception as exc: test_case.assertEqual(str(exc)[:len(msg)], msg) else: test_case.fail('Expecting %s' % exception)
[docs]def assert_rel_error(test_case, actual, desired, tolerance): """ Determine that the relative error between `actual` and `desired` is within `tolerance`. If `desired` is zero, then use absolute error. test_case: :class:`unittest.TestCase` TestCase instance used for assertions. actual: float The value from the test. desired: float The value expected. tolerance: float Maximum relative error ``(actual - desired) / desired``. """ try: actual[0] except (TypeError, IndexError): if isnan(actual) and not isnan(desired): test_case.fail('actual nan, desired %s, rel error nan, tolerance %s' % (desired, tolerance)) if desired != 0: error = (actual - desired) / desired else: error = actual if abs(error) > tolerance: test_case.fail('actual %s, desired %s, rel error %s, tolerance %s' % (actual, desired, error, tolerance)) else: for i, (act, des) in enumerate(zip(actual, desired)): if isnan(act) and not isnan(des): test_case.fail('at %d: actual nan, desired %s, rel error nan,' ' tolerance %s' % (i, des, tolerance)) if des != 0: error = (act - des) / des else: error = act if abs(error) > tolerance: test_case.fail('at %d: actual %s, desired %s, rel error %s,' ' tolerance %s' % (i, act, des, error, tolerance))
[docs]def find_python(): """ Return path to the OpenMDAO Python command.""" return sys.executable
[docs]def make_protected_dir(): """ Returns the the absolute path of an inaccessible directory. Files cannot be created in it; it can't be :meth:`os.chdir` to, etc. Not supported on Windows. """ directory = '__protected__' if os.path.exists(directory): os.rmdir(directory) os.mkdir(directory) os.chmod(directory, 0) return os.path.join(os.getcwd(), directory)
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