#
# LSST Data Management System
#
# Copyright 2008-2017 AURA/LSST.
#
# This product includes software developed by the
# LSST Project (http://www.lsst.org/).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the LSST License Statement and
# the GNU General Public License along with this program. If not,
# see <https://www.lsstcorp.org/LegalNotices/>.
#
"""Support code for running unit tests"""
from __future__ import print_function
from __future__ import division
from builtins import zip
from builtins import range
import contextlib
import gc
import inspect
import os
import subprocess
import sys
import unittest
import warnings
import numpy
import functools
import tempfile
__all__ = ["init", "run", "MemoryTestCase", "ExecutablesTestCase", "getTempFilePath",
"TestCase", "assertFloatsAlmostEqual", "assertFloatsNotEqual", "assertFloatsEqual"]
# File descriptor leak test will be skipped if psutil can not be imported
try:
import psutil
except ImportError:
psutil = None
try:
import lsst.daf.base as dafBase
except ImportError:
dafBase = None
try:
type(memId0)
except NameError:
memId0 = 0 # ignore leaked blocks with IDs before memId0
nleakPrintMax = 20 # maximum number of leaked blocks to print
# Initialize the list of open files to an empty set
open_files = set()
def _get_open_files():
"""Return a set containing the list of files currently open in this
process.
Returns
-------
open_files : `set`
Set containing the list of open files.
"""
if psutil is None:
return set()
return set(p.path for p in psutil.Process().open_files())
[docs]def init():
"""Initialize the memory tester and file descriptor leak tester."""
global memId0
global open_files
if dafBase:
memId0 = dafBase.Citizen.getNextMemId() # used by MemoryTestCase
# Reset the list of open files
open_files = _get_open_files()
[docs]def run(suite, exit=True):
"""Run a test suite and report the test return status to caller or shell.
.. note:: Deprecated in 13_0
Use `unittest.main()` instead, which automatically detects
all tests in a test case and does not require a test suite.
Parameters
----------
suite : `unittest.TestSuite`
Test suite to run.
exit : `bool`, optional
If `True`, Python process will exit with the test exit status.
Returns
-------
status : `int`
If ``exit`` is `False`, will return 0 if the tests passed, or 1 if
the tests failed.
"""
warnings.warn("lsst.utils.tests.run() is deprecated; please use unittest.main() instead",
DeprecationWarning, stacklevel=2)
if unittest.TextTestRunner().run(suite).wasSuccessful():
status = 0
else:
status = 1
if exit:
sys.exit(status)
else:
return status
def sort_tests(tests):
"""Sort supplied test suites such that MemoryTestCases are at the end.
`lsst.utils.tests.MemoryTestCase` tests should always run after any other
tests in the module.
Parameters
----------
tests : sequence
Sequence of test suites.
Returns
-------
suite : `unittest.TestSuite`
A combined `~unittest.TestSuite` with
`~lsst.utils.tests.MemoryTestCase` at the end.
"""
suite = unittest.TestSuite()
memtests = []
for test_suite in tests:
try:
# Just test the first test method in the suite for MemoryTestCase
# Use loop rather than next as it is possible for a test class
# to not have any test methods and the Python community prefers
# for loops over catching a StopIteration exception.
bases = None
for method in test_suite:
bases = inspect.getmro(method.__class__)
break
if bases is not None and MemoryTestCase in bases:
memtests.append(test_suite)
else:
suite.addTests(test_suite)
except TypeError:
if isinstance(test_suite, MemoryTestCase):
memtests.append(test_suite)
else:
suite.addTest(test_suite)
suite.addTests(memtests)
return suite
def suiteClassWrapper(tests):
return unittest.TestSuite(sort_tests(tests))
# Replace the suiteClass callable in the defaultTestLoader
# so that we can reorder the test ordering. This will have
# no effect if no memory test cases are found.
unittest.defaultTestLoader.suiteClass = suiteClassWrapper
[docs]class MemoryTestCase(unittest.TestCase):
"""Check for memory leaks since memId0 was allocated"""
@classmethod
[docs] def tearDownClass(cls):
"""Reset the leak counter when the tests have been completed"""
init()
[docs] def testLeaks(self):
"""Check for memory leaks in the preceding tests"""
if dafBase:
gc.collect()
global memId0, nleakPrintMax
nleak = dafBase.Citizen.census(0, memId0)
if nleak != 0:
plural = "s" if nleak != 1 else ""
print("\n%d Object%s leaked:" % (nleak, plural))
if nleak <= nleakPrintMax:
print(dafBase.Citizen.census(memId0))
else:
census = dafBase.Citizen.census()
print("...")
for i in range(nleakPrintMax - 1, -1, -1):
print(census[i].repr())
self.fail("Leaked %d block%s" % (nleak, plural))
[docs] def testFileDescriptorLeaks(self):
"""Check if any file descriptors are open since init() called."""
if psutil is None:
self.skipTest("Unable to test file descriptor leaks. psutil unavailable.")
gc.collect()
global open_files
now_open = _get_open_files()
# Some files are opened out of the control of the stack.
now_open = set(f for f in now_open if not f.endswith(".car") and
not f.startswith("/proc/") and
not f.endswith(".ttf") and
not (f.startswith("/var/lib/") and f.endswith("/passwd")) and
not f.endswith("astropy.log"))
diff = now_open.difference(open_files)
if diff:
for f in diff:
print("File open: %s" % f)
self.fail("Failed to close %d file%s" % (len(diff), "s" if len(diff) != 1 else ""))
[docs]class ExecutablesTestCase(unittest.TestCase):
"""Test that executables can be run and return good status.
The test methods are dynamically created. Callers
must subclass this class in their own test file and invoke
the create_executable_tests() class method to register the tests.
"""
TESTS_DISCOVERED = -1
@classmethod
[docs] def setUpClass(cls):
"""Abort testing if automated test creation was enabled and
no tests were found."""
if cls.TESTS_DISCOVERED == 0:
raise Exception("No executables discovered.")
[docs] def testSanity(self):
"""This test exists to ensure that there is at least one test to be
executed. This allows the test runner to trigger the class set up
machinery to test whether there are some executables to test."""
pass
[docs] def assertExecutable(self, executable, root_dir=None, args=None, msg=None):
"""Check an executable runs and returns good status.
Prints output to standard out. On bad exit status the test
fails. If the executable can not be located the test is skipped.
Parameters
----------
executable : `str`
Path to an executable. ``root_dir`` is not used if this is an
absolute path.
root_dir : `str`, optional
Directory containing executable. Ignored if `None`.
args : `list` or `tuple`, optional
Arguments to be provided to the executable.
msg : `str`, optional
Message to use when the test fails. Can be `None` for default
message.
Raises
------
AssertionError
The executable did not return 0 exit status.
"""
if root_dir is not None and not os.path.isabs(executable):
executable = os.path.join(root_dir, executable)
# Form the argument list for subprocess
sp_args = [executable]
argstr = "no arguments"
if args is not None:
sp_args.extend(args)
argstr = 'arguments "' + " ".join(args) + '"'
print("Running executable '{}' with {}...".format(executable, argstr))
if not os.path.exists(executable):
self.skipTest("Executable {} is unexpectedly missing".format(executable))
failmsg = None
try:
output = subprocess.check_output(sp_args)
except subprocess.CalledProcessError as e:
output = e.output
failmsg = "Bad exit status from '{}': {}".format(executable, e.returncode)
print(output.decode('utf-8'))
if failmsg:
if msg is None:
msg = failmsg
self.fail(msg)
@classmethod
def _build_test_method(cls, executable, root_dir):
"""Build a test method and attach to class.
A test method is created for the supplied excutable located
in the supplied root directory. This method is attached to the class
so that the test runner will discover the test and run it.
Parameters
----------
cls : `object`
The class in which to create the tests.
executable : `str`
Name of executable. Can be absolute path.
root_dir : `str`
Path to executable. Not used if executable path is absolute.
"""
if not os.path.isabs(executable):
executable = os.path.abspath(os.path.join(root_dir, executable))
# Create the test name from the executable path.
test_name = "test_exe_" + executable.replace("/", "_")
# This is the function that will become the test method
def test_executable_runs(*args):
self = args[0]
self.assertExecutable(executable)
# Give it a name and attach it to the class
test_executable_runs.__name__ = test_name
setattr(cls, test_name, test_executable_runs)
@classmethod
[docs] def create_executable_tests(cls, ref_file, executables=None):
"""Discover executables to test and create corresponding test methods.
Scans the directory containing the supplied reference file
(usually ``__file__`` supplied from the test class) to look for
executables. If executables are found a test method is created
for each one. That test method will run the executable and
check the returned value.
Executable scripts with a ``.py`` extension and shared libraries
are ignored by the scanner.
This class method must be called before test discovery.
Parameters
----------
ref_file : `str`
Path to a file within the directory to be searched.
If the files are in the same location as the test file, then
``__file__`` can be used.
executables : `list` or `tuple`, optional
Sequence of executables that can override the automated
detection. If an executable mentioned here is not found, a
skipped test will be created for it, rather than a failed
test.
Examples
--------
>>> cls.create_executable_tests(__file__)
"""
# Get the search directory from the reference file
ref_dir = os.path.abspath(os.path.dirname(ref_file))
if executables is None:
# Look for executables to test by walking the tree
executables = []
for root, dirs, files in os.walk(ref_dir):
for f in files:
# Skip Python files. Shared libraries are executable.
if not f.endswith(".py") and not f.endswith(".so"):
full_path = os.path.join(root, f)
if os.access(full_path, os.X_OK):
executables.append(full_path)
# Store the number of tests found for later assessment.
# Do not raise an exception if we have no executables as this would
# cause the testing to abort before the test runner could properly
# integrate it into the failure report.
cls.TESTS_DISCOVERED = len(executables)
# Create the test functions and attach them to the class
for e in executables:
cls._build_test_method(e, ref_dir)
@contextlib.contextmanager
[docs]def getTempFilePath(ext, expectOutput=True):
"""Return a path suitable for a temporary file and try to delete the
file on success
If the with block completes successfully then the file is deleted,
if possible; failure results in a printed warning.
If a file is remains when it should not, a RuntimeError exception is
raised. This exception is also raised if a file is not present on context
manager exit when one is expected to exist.
If the block exits with an exception the file if left on disk so it can be
examined. The file name has a random component such that nested context
managers can be used with the same file suffix.
Parameters
----------
ext : `str`
File name extension, e.g. ``.fits``.
expectOutput : `bool`, optional
If `True`, a file should be created within the context manager.
If `False`, a file should not be present when the context manager
exits.
Returns
-------
`str`
Path for a temporary file. The path is a combination of the caller's
file path and the name of the top-level function
Notes
-----
::
# file tests/testFoo.py
import unittest
import lsst.utils.tests
class FooTestCase(unittest.TestCase):
def testBasics(self):
self.runTest()
def runTest(self):
with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
# if tests/.tests exists then
# tmpFile = "tests/.tests/testFoo_testBasics.fits"
# otherwise tmpFile = "testFoo_testBasics.fits"
...
# at the end of this "with" block the path tmpFile will be
# deleted, but only if the file exists and the "with"
# block terminated normally (rather than with an exception)
...
"""
stack = inspect.stack()
# get name of first function in the file
for i in range(2, len(stack)):
frameInfo = inspect.getframeinfo(stack[i][0])
if i == 2:
callerFilePath = frameInfo.filename
callerFuncName = frameInfo.function
elif callerFilePath == frameInfo.filename:
# this function called the previous function
callerFuncName = frameInfo.function
else:
break
callerDir, callerFileNameWithExt = os.path.split(callerFilePath)
callerFileName = os.path.splitext(callerFileNameWithExt)[0]
outDir = os.path.join(callerDir, ".tests")
if not os.path.isdir(outDir):
outDir = ""
prefix = "%s_%s-" % (callerFileName, callerFuncName)
outPath = tempfile.mktemp(dir=outDir, suffix=ext, prefix=prefix)
if os.path.exists(outPath):
# There should not be a file there given the randomizer. Warn and remove.
# Use stacklevel 3 so that the warning is reported from the end of the with block
warnings.warn("Unexpectedly found pre-existing tempfile named %r" % (outPath,),
stacklevel=3)
try:
os.remove(outPath)
except OSError:
pass
yield outPath
fileExists = os.path.exists(outPath)
if expectOutput:
if not fileExists:
raise RuntimeError("Temp file expected named {} but none found".format(outPath))
else:
if fileExists:
raise RuntimeError("Unexpectedly discovered temp file named {}".format(outPath))
# Try to clean up the file regardless
if fileExists:
try:
os.remove(outPath)
except OSError as e:
# Use stacklevel 3 so that the warning is reported from the end of the with block
warnings.warn("Warning: could not remove file %r: %s" % (outPath, e), stacklevel=3)
[docs]class TestCase(unittest.TestCase):
"""Subclass of unittest.TestCase that adds some custom assertions for
convenience.
"""
def inTestCase(func):
"""A decorator to add a free function to our custom TestCase class, while also
making it available as a free function.
"""
setattr(TestCase, func.__name__, func)
return func
@inTestCase
def assertRaisesLsstCpp(testcase, excClass, callableObj, *args, **kwargs):
""".. note:: Deprecated in 12_0"""
warnings.warn("assertRaisesLsstCpp is deprecated; please just use TestCase.assertRaises",
DeprecationWarning, stacklevel=2)
return testcase.assertRaises(excClass, callableObj, *args, **kwargs)
def debugger(*exceptions):
"""Decorator to enter the debugger when there's an uncaught exception
To use, just slap a ``@debugger()`` on your function.
You may provide specific exception classes to catch as arguments to
the decorator function, e.g.,
``@debugger(RuntimeError, NotImplementedError)``.
This defaults to just `AssertionError`, for use on `unittest.TestCase`
methods.
Code provided by "Rosh Oxymoron" on StackOverflow:
http://stackoverflow.com/questions/4398967/python-unit-testing-automatically-running-the-debugger-when-a-test-fails
Notes
-----
Consider using ``pytest --pdb`` instead of this decorator.
"""
if not exceptions:
exceptions = (AssertionError, )
def decorator(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
try:
return f(*args, **kwargs)
except exceptions:
import sys
import pdb
pdb.post_mortem(sys.exc_info()[2])
return wrapper
return decorator
def plotImageDiff(lhs, rhs, bad=None, diff=None, plotFileName=None):
"""Plot the comparison of two 2-d NumPy arrays.
Parameters
----------
lhs : `numpy.ndarray`
LHS values to compare; a 2-d NumPy array
rhs : `numpy.ndarray`
RHS values to compare; a 2-d NumPy array
bad : `numpy.ndarray`
A 2-d boolean NumPy array of values to emphasize in the plots
diff : `numpy.ndarray`
difference array; a 2-d NumPy array, or None to show lhs-rhs
plotFileName : `str`
Filename to save the plot to. If None, the plot will be displayed in
a window.
Notes
-----
This method uses `matplotlib` and imports it internally; it should be
wrapped in a try/except block within packages that do not depend on
`matplotlib` (including `~lsst.utils`).
"""
from matplotlib import pyplot
if diff is None:
diff = lhs - rhs
pyplot.figure()
if bad is not None:
# make an rgba image that's red and transparent where not bad
badImage = numpy.zeros(bad.shape + (4,), dtype=numpy.uint8)
badImage[:, :, 0] = 255
badImage[:, :, 1] = 0
badImage[:, :, 2] = 0
badImage[:, :, 3] = 255*bad
vmin1 = numpy.minimum(numpy.min(lhs), numpy.min(rhs))
vmax1 = numpy.maximum(numpy.max(lhs), numpy.max(rhs))
vmin2 = numpy.min(diff)
vmax2 = numpy.max(diff)
for n, (image, title) in enumerate([(lhs, "lhs"), (rhs, "rhs"), (diff, "diff")]):
pyplot.subplot(2, 3, n + 1)
im1 = pyplot.imshow(image, cmap=pyplot.cm.gray, interpolation='nearest', origin='lower',
vmin=vmin1, vmax=vmax1)
if bad is not None:
pyplot.imshow(badImage, alpha=0.2, interpolation='nearest', origin='lower')
pyplot.axis("off")
pyplot.title(title)
pyplot.subplot(2, 3, n + 4)
im2 = pyplot.imshow(image, cmap=pyplot.cm.gray, interpolation='nearest', origin='lower',
vmin=vmin2, vmax=vmax2)
if bad is not None:
pyplot.imshow(badImage, alpha=0.2, interpolation='nearest', origin='lower')
pyplot.axis("off")
pyplot.title(title)
pyplot.subplots_adjust(left=0.05, bottom=0.05, top=0.92, right=0.75, wspace=0.05, hspace=0.05)
cax1 = pyplot.axes([0.8, 0.55, 0.05, 0.4])
pyplot.colorbar(im1, cax=cax1)
cax2 = pyplot.axes([0.8, 0.05, 0.05, 0.4])
pyplot.colorbar(im2, cax=cax2)
if plotFileName:
pyplot.savefig(plotFileName)
else:
pyplot.show()
@inTestCase
[docs]def assertFloatsAlmostEqual(testCase, lhs, rhs, rtol=sys.float_info.epsilon,
atol=sys.float_info.epsilon, relTo=None,
printFailures=True, plotOnFailure=False,
plotFileName=None, invert=False, msg=None):
"""Highly-configurable floating point comparisons for scalars and arrays.
The test assertion will fail if all elements ``lhs`` and ``rhs`` are not
equal to within the tolerances specified by ``rtol`` and ``atol``.
More precisely, the comparison is:
``abs(lhs - rhs) <= relTo*rtol OR abs(lhs - rhs) <= atol``
If ``rtol`` or ``atol`` is `None`, that term in the comparison is not
performed at all.
When not specified, ``relTo`` is the elementwise maximum of the absolute
values of ``lhs`` and ``rhs``. If set manually, it should usually be set
to either ``lhs`` or ``rhs``, or a scalar value typical of what is
expected.
Parameters
----------
testCase : `unittest.TestCase`
Instance the test is part of.
lhs : scalar or array-like
LHS value(s) to compare; may be a scalar or array-like of any
dimension.
rhs : scalar or array-like
RHS value(s) to compare; may be a scalar or array-like of any
dimension.
rtol : `float`, optional
Relative tolerance for comparison; defaults to double-precision
epsilon.
atol : `float`, optional
Absolute tolerance for comparison; defaults to double-precision
epsilon.
relTo : `float`, optional
Value to which comparison with rtol is relative.
printFailures : `bool`, optional
Upon failure, print all inequal elements as part of the message.
plotOnFailure : `bool`, optional
Upon failure, plot the originals and their residual with matplotlib.
Only 2-d arrays are supported.
plotFileName : `str`, optional
Filename to save the plot to. If `None`, the plot will be displayed in
a window.
invert : `bool`, optional
If `True`, invert the comparison and fail only if any elements *are*
equal. Used to implement `~lsst.utils.tests.assertFloatsNotEqual`,
which should generally be used instead for clarity.
msg : `str`, optional
String to append to the error message when assert fails.
Raises
------
AssertionError
The values are not almost equal.
"""
if not numpy.isfinite(lhs).all():
testCase.fail("Non-finite values in lhs")
if not numpy.isfinite(rhs).all():
testCase.fail("Non-finite values in rhs")
diff = lhs - rhs
absDiff = numpy.abs(lhs - rhs)
if rtol is not None:
if relTo is None:
relTo = numpy.maximum(numpy.abs(lhs), numpy.abs(rhs))
else:
relTo = numpy.abs(relTo)
bad = absDiff > rtol*relTo
if atol is not None:
bad = numpy.logical_and(bad, absDiff > atol)
else:
if atol is None:
raise ValueError("rtol and atol cannot both be None")
bad = absDiff > atol
failed = numpy.any(bad)
if invert:
failed = not failed
bad = numpy.logical_not(bad)
cmpStr = "=="
failStr = "are the same"
else:
cmpStr = "!="
failStr = "differ"
errMsg = []
if failed:
if numpy.isscalar(bad):
if rtol is None:
errMsg = ["%s %s %s; diff=%s with atol=%s"
% (lhs, cmpStr, rhs, absDiff, atol)]
elif atol is None:
errMsg = ["%s %s %s; diff=%s/%s=%s with rtol=%s"
% (lhs, cmpStr, rhs, absDiff, relTo, absDiff/relTo, rtol)]
else:
errMsg = ["%s %s %s; diff=%s/%s=%s with rtol=%s, atol=%s"
% (lhs, cmpStr, rhs, absDiff, relTo, absDiff/relTo, rtol, atol)]
else:
errMsg = ["%d/%d elements %s with rtol=%s, atol=%s"
% (bad.sum(), bad.size, failStr, rtol, atol)]
if plotOnFailure:
if len(lhs.shape) != 2 or len(rhs.shape) != 2:
raise ValueError("plotOnFailure is only valid for 2-d arrays")
try:
plotImageDiff(lhs, rhs, bad, diff=diff, plotFileName=plotFileName)
except ImportError:
errMsg.append("Failure plot requested but matplotlib could not be imported.")
if printFailures:
# Make sure everything is an array if any of them are, so we can treat
# them the same (diff and absDiff are arrays if either rhs or lhs is),
# and we don't get here if neither is.
if numpy.isscalar(relTo):
relTo = numpy.ones(bad.shape, dtype=float) * relTo
if numpy.isscalar(lhs):
lhs = numpy.ones(bad.shape, dtype=float) * lhs
if numpy.isscalar(rhs):
rhs = numpy.ones(bad.shape, dtype=float) * rhs
if rtol is None:
for a, b, diff in zip(lhs[bad], rhs[bad], absDiff[bad]):
errMsg.append("%s %s %s (diff=%s)" % (a, cmpStr, b, diff))
else:
for a, b, diff, rel in zip(lhs[bad], rhs[bad], absDiff[bad], relTo[bad]):
errMsg.append("%s %s %s (diff=%s/%s=%s)" % (a, cmpStr, b, diff, rel, diff/rel))
if msg is not None:
errMsg.append(msg)
testCase.assertFalse(failed, msg="\n".join(errMsg))
@inTestCase
[docs]def assertFloatsNotEqual(testCase, lhs, rhs, **kwds):
"""Fail a test if the given floating point values are equal to within the
given tolerances.
See `~lsst.utils.tests.assertFloatsAlmostEqual` (called with
``rtol=atol=0``) for more information.
Parameters
----------
testCase : `unittest.TestCase`
Instance the test is part of.
lhs : scalar or array-like
LHS value(s) to compare; may be a scalar or array-like of any
dimension.
rhs : scalar or array-like
RHS value(s) to compare; may be a scalar or array-like of any
dimension.
Raises
------
AssertionError
The values are almost equal.
"""
return assertFloatsAlmostEqual(testCase, lhs, rhs, invert=True, **kwds)
@inTestCase
[docs]def assertFloatsEqual(testCase, lhs, rhs, **kwargs):
"""
Assert that lhs == rhs (both numeric types, whether scalar or array).
See `~lsst.utils.tests.assertFloatsAlmostEqual` (called with
``rtol=atol=0``) for more information.
Parameters
----------
testCase : `unittest.TestCase`
Instance the test is part of.
lhs : scalar or array-like
LHS value(s) to compare; may be a scalar or array-like of any
dimension.
rhs : scalar or array-like
RHS value(s) to compare; may be a scalar or array-like of any
dimension.
Raises
------
AssertionError
The values are not equal.
"""
return assertFloatsAlmostEqual(testCase, lhs, rhs, rtol=0, atol=0, **kwargs)
@inTestCase
def assertClose(*args, **kwargs):
""".. note:: Deprecated in 12_0"""
warnings.warn("assertClose is deprecated; please use TestCase.assertFloatsAlmostEqual",
DeprecationWarning, stacklevel=2)
return assertFloatsAlmostEqual(*args, **kwargs)
@inTestCase
def assertNotClose(*args, **kwargs):
""".. note:: Deprecated in 12_0"""
warnings.warn("assertNotClose is deprecated; please use TestCase.assertFloatsNotEqual",
DeprecationWarning, stacklevel=2)
return assertFloatsNotEqual(*args, **kwargs)