"""Test result object"""
import io
import sys
import traceback
from . import util
from functools import wraps
__unittest = True
def failfast(method):
@wraps(method)
def inner(self, *args, **kw):
if getattr(self, 'failfast', False):
self.stop()
return method(self, *args, **kw)
return inner
STDOUT_LINE = '\nStdout:\n%s'
STDERR_LINE = '\nStderr:\n%s'
class TestResult(object):
"""Holder for test result information.
Test results are automatically managed by the TestCase and TestSuite
classes, and do not need to be explicitly manipulated by writers of tests.
Each instance holds the total number of tests run, and collections of
failures and errors that occurred among those test runs. The collections
contain tuples of (testcase, exceptioninfo), where exceptioninfo is the
formatted traceback of the error that occurred.
"""
_previousTestClass = None
_testRunEntered = False
_moduleSetUpFailed = False
def __init__(self, stream=None, descriptions=None, verbosity=None):
self.failfast = False
self.failures = []
self.errors = []
self.testsRun = 0
self.skipped = []
self.expectedFailures = []
self.unexpectedSuccesses = []
self.collectedDurations = []
self.shouldStop = False
self.buffer = False
self.tb_locals = False
self._stdout_buffer = None
self._stderr_buffer = None
self._original_stdout = sys.stdout
self._original_stderr = sys.stderr
self._mirrorOutput = False
def printErrors(self):
"Called by TestRunner after test run"
def startTest(self, test):
"Called when the given test is about to be run"
self.testsRun += 1
self._mirrorOutput = False
self._setupStdout()
def _setupStdout(self):
if self.buffer:
if self._stderr_buffer is None:
self._stderr_buffer = io.StringIO()
self._stdout_buffer = io.StringIO()
sys.stdout = self._stdout_buffer
sys.stderr = self._stderr_buffer
def startTestRun(self):
"""Called once before any tests are executed.
See startTest for a method called before each test.
"""
def stopTest(self, test):
"""Called when the given test has been run"""
self._restoreStdout()
self._mirrorOutput = False
def _restoreStdout(self):
if self.buffer:
if self._mirrorOutput:
output = sys.stdout.getvalue()
error = sys.stderr.getvalue()
if output:
if not output.endswith('\n'):
output += '\n'
self._original_stdout.write(STDOUT_LINE % output)
if error:
if not error.endswith('\n'):
error += '\n'
self._original_stderr.write(STDERR_LINE % error)
sys.stdout = self._original_stdout
sys.stderr = self._original_stderr
self._stdout_buffer.seek(0)
self._stdout_buffer.truncate()
self._stderr_buffer.seek(0)
self._stderr_buffer.truncate()
def stopTestRun(self):
"""Called once after all tests are executed.
See stopTest for a method called after each test.
"""
@failfast
def addError(self, test, err):
"""Called when an error has occurred. 'err' is a tuple of values as
returned by sys.exc_info().
"""
self.errors.append((test, self._exc_info_to_string(err, test)))
self._mirrorOutput = True
@failfast
def addFailure(self, test, err):
"""Called when an error has occurred. 'err' is a tuple of values as
returned by sys.exc_info()."""
self.failures.append((test, self._exc_info_to_string(err, test)))
self._mirrorOutput = True
def addSubTest(self, test, subtest, err):
"""Called at the end of a subtest.
'err' is None if the subtest ended successfully, otherwise it's a
tuple of values as returned by sys.exc_info().
"""
# By default, we don't do anything with successful subtests, but
# more sophisticated test results might want to record them.
if err is not None:
if getattr(self, 'failfast', False):
self.stop()
if issubclass(err[0], test.failureException):
errors = self.failures
else:
errors = self.errors
errors.append((subtest, self._exc_info_to_string(err, test)))
self._mirrorOutput = True
def addSuccess(self, test):
"Called when a test has completed successfully"
pass
def addSkip(self, test, reason):
"""Called when a test is skipped."""
self.skipped.append((test, reason))
def addExpectedFailure(self, test, err):
"""Called when an expected failure/error occurred."""
self.expectedFailures.append(
(test, self._exc_info_to_string(err, test)))
@failfast
def addUnexpectedSuccess(self, test):
"""Called when a test was expected to fail, but succeed."""
self.unexpectedSuccesses.append(test)
def addDuration(self, test, elapsed):
"""Called when a test finished to run, regardless of its outcome.
*test* is the test case corresponding to the test method.
*elapsed* is the time represented in seconds, and it includes the
execution of cleanup functions.
"""
# support for a TextTestRunner using an old TestResult class
if hasattr(self, "collectedDurations"):
# Pass test repr and not the test object itself to avoid resources leak
self.collectedDurations.append((str(test), elapsed))
def wasSuccessful(self):
"""Tells whether or not this result was a success."""
# The hasattr check is for test_result's OldResult test. That
# way this method works on objects that lack the attribute.
# (where would such result instances come from? old stored pickles?)
return ((len(self.failures) == len(self.errors) == 0) and
(not hasattr(self, 'unexpectedSuccesses') or
len(self.unexpectedSuccesses) == 0))
def stop(self):
"""Indicates that the tests should be aborted."""
self.shouldStop = True
def _exc_info_to_string(self, err, test):
"""Converts a sys.exc_info()-style tuple of values into a string."""
exctype, value, tb = err
tb = self._clean_tracebacks(exctype, value, tb, test)
tb_e = traceback.TracebackException(
exctype, value, tb,
capture_locals=self.tb_locals, compact=True)
msgLines = list(tb_e.format())
if self.buffer:
output = sys.stdout.getvalue()
error = sys.stderr.getvalue()
if output:
if not output.endswith('\n'):
output += '\n'
msgLines.append(STDOUT_LINE % output)
if error:
if not error.endswith('\n'):
error += '\n'
msgLines.append(STDERR_LINE % error)
return ''.join(msgLines)
def _clean_tracebacks(self, exctype, value, tb, test):
ret = None
first = True
excs = [(exctype, value, tb)]
seen = {id(value)} # Detect loops in chained exceptions.
while excs:
(exctype, value, tb) = excs.pop()
# Skip test runner traceback levels
while tb and self._is_relevant_tb_level(tb):
tb = tb.tb_next
# Skip assert*() traceback levels
if exctype is test.failureException:
self._remove_unittest_tb_frames(tb)
if first:
ret = tb
first = False
else:
value.__traceback__ = tb
if value is not None:
for c in (value.__cause__, value.__context__):
if c is not None and id(c) not in seen:
excs.append((type(c), c, c.__traceback__))
seen.add(id(c))
return ret
def _is_relevant_tb_level(self, tb):
return '__unittest' in tb.tb_frame.f_globals
def _remove_unittest_tb_frames(self, tb):
'''Truncates usercode tb at the first unittest frame.
If the first frame of the traceback is in user code,
the prefix up to the first unittest frame is returned.
If the first frame is already in the unittest module,
the traceback is not modified.
'''
prev = None
while tb and not self._is_relevant_tb_level(tb):
prev = tb
tb = tb.tb_next
if prev is not None:
prev.tb_next = None
def __repr__(self):
return ("<%s run=%i errors=%i failures=%i>" %
(util.strclass(self.__class__), self.testsRun, len(self.errors),
len(self.failures)))
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