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result.py
"""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.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 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) 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)] 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: excs.append((type(c), c, c.__traceback__)) 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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