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273 lines
11 KiB
Python
273 lines
11 KiB
Python
import math
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import mozinfo
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class Bisect(object):
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"Class for creating, bisecting and summarizing for --bisect-chunk option."
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def __init__(self, harness):
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super(Bisect, self).__init__()
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self.summary = []
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self.contents = {}
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self.testRoot = harness.testRoot
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self.testRootAbs = harness.testRootAbs
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self.repeat = 10
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self.failcount = 0
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self.max_failures = 3
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def setup(self, tests):
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"This method is used to initialize various variables that are required for test bisection"
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status = 0
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self.contents.clear()
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# We need totalTests key in contents for sanity check
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self.contents['totalTests'] = tests
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self.contents['tests'] = tests
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self.contents['loop'] = 0
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return status
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def reset(self, expectedError, result):
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"This method is used to initialize self.expectedError and self.result for each loop in runtests."
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self.expectedError = expectedError
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self.result = result
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def get_tests_for_bisection(self, options, tests):
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"Make a list of tests for bisection from a given list of tests"
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bisectlist = []
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for test in tests:
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bisectlist.append(test)
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if test.endswith(options.bisectChunk):
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break
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return bisectlist
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def pre_test(self, options, tests, status):
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"This method is used to call other methods for setting up variables and getting the list of tests for bisection."
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if options.bisectChunk == "default":
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return tests
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# The second condition in 'if' is required to verify that the failing
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# test is the last one.
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elif 'loop' not in self.contents or not self.contents['tests'][-1].endswith(options.bisectChunk):
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tests = self.get_tests_for_bisection(options, tests)
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status = self.setup(tests)
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return self.next_chunk_binary(options, status)
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def post_test(self, options, expectedError, result):
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"This method is used to call other methods to summarize results and check whether a sanity check is done or not."
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self.reset(expectedError, result)
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status = self.summarize_chunk(options)
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# Check whether sanity check has to be done. Also it is necessary to check whether options.bisectChunk is present
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# in self.expectedError as we do not want to run if it is "default".
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if status == -1 and options.bisectChunk in self.expectedError:
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# In case we have a debug build, we don't want to run a sanity
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# check, will take too much time.
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if mozinfo.info['debug']:
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return status
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testBleedThrough = self.contents['testsToRun'][0]
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tests = self.contents['totalTests']
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tests.remove(testBleedThrough)
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# To make sure that the failing test is dependent on some other
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# test.
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if options.bisectChunk in testBleedThrough:
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return status
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status = self.setup(tests)
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self.summary.append("Sanity Check:")
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return status
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def next_chunk_reverse(self, options, status):
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"This method is used to bisect the tests in a reverse search fashion."
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# Base Cases.
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if self.contents['loop'] <= 1:
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self.contents['testsToRun'] = self.contents['tests']
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if self.contents['loop'] == 1:
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self.contents['testsToRun'] = [self.contents['tests'][-1]]
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self.contents['loop'] += 1
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return self.contents['testsToRun']
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if 'result' in self.contents:
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if self.contents['result'] == "PASS":
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chunkSize = self.contents['end'] - self.contents['start']
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self.contents['end'] = self.contents['start'] - 1
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self.contents['start'] = self.contents['end'] - chunkSize
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# self.contents['result'] will be expected error only if it fails.
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elif self.contents['result'] == "FAIL":
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self.contents['tests'] = self.contents['testsToRun']
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status = 1 # for initializing
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# initialize
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if status:
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totalTests = len(self.contents['tests'])
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chunkSize = int(math.ceil(totalTests / 10.0))
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self.contents['start'] = totalTests - chunkSize - 1
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self.contents['end'] = totalTests - 2
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start = self.contents['start']
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end = self.contents['end'] + 1
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self.contents['testsToRun'] = self.contents['tests'][start:end]
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self.contents['testsToRun'].append(self.contents['tests'][-1])
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self.contents['loop'] += 1
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return self.contents['testsToRun']
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def next_chunk_binary(self, options, status):
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"This method is used to bisect the tests in a binary search fashion."
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# Base cases.
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if self.contents['loop'] <= 1:
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self.contents['testsToRun'] = self.contents['tests']
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if self.contents['loop'] == 1:
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self.contents['testsToRun'] = [self.contents['tests'][-1]]
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self.contents['loop'] += 1
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return self.contents['testsToRun']
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# Initialize the contents dict.
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if status:
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totalTests = len(self.contents['tests'])
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self.contents['start'] = 0
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self.contents['end'] = totalTests - 2
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mid = (self.contents['start'] + self.contents['end']) / 2
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if 'result' in self.contents:
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if self.contents['result'] == "PASS":
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self.contents['end'] = mid
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elif self.contents['result'] == "FAIL":
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self.contents['start'] = mid + 1
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mid = (self.contents['start'] + self.contents['end']) / 2
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start = mid + 1
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end = self.contents['end'] + 1
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self.contents['testsToRun'] = self.contents['tests'][start:end]
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if not self.contents['testsToRun']:
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self.contents['testsToRun'].append(self.contents['tests'][mid])
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self.contents['testsToRun'].append(self.contents['tests'][-1])
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self.contents['loop'] += 1
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return self.contents['testsToRun']
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def summarize_chunk(self, options):
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"This method is used summarize the results after the list of tests is run."
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if options.bisectChunk == "default":
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# if no expectedError that means all the tests have successfully
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# passed.
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if len(self.expectedError) == 0:
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return -1
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options.bisectChunk = self.expectedError.keys()[0]
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self.summary.append(
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"\tFound Error in test: %s" %
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options.bisectChunk)
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return 0
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# If options.bisectChunk is not in self.result then we need to move to
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# the next run.
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if options.bisectChunk not in self.result:
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return -1
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self.summary.append("\tPass %d:" % self.contents['loop'])
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if len(self.contents['testsToRun']) > 1:
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self.summary.append(
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"\t\t%d test files(start,end,failing). [%s, %s, %s]" % (len(
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self.contents['testsToRun']),
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self.contents['testsToRun'][0],
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self.contents['testsToRun'][
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-2],
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self.contents['testsToRun'][
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-1]))
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else:
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self.summary.append(
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"\t\t1 test file [%s]" %
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self.contents['testsToRun'][0])
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return self.check_for_intermittent(options)
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if self.result[options.bisectChunk] == "PASS":
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self.summary.append("\t\tno failures found.")
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if self.contents['loop'] == 1:
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status = -1
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else:
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self.contents['result'] = "PASS"
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status = 0
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elif self.result[options.bisectChunk] == "FAIL":
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if 'expectedError' not in self.contents:
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self.summary.append("\t\t%s failed." %
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self.contents['testsToRun'][-1])
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self.contents['expectedError'] = self.expectedError[
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options.bisectChunk]
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status = 0
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elif self.expectedError[options.bisectChunk] == self.contents['expectedError']:
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self.summary.append(
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"\t\t%s failed with expected error." % self.contents['testsToRun'][-1])
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self.contents['result'] = "FAIL"
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status = 0
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# This code checks for test-bleedthrough. Should work for any
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# algorithm.
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numberOfTests = len(self.contents['testsToRun'])
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if numberOfTests < 3:
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# This means that only 2 tests are run. Since the last test
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# is the failing test itself therefore the bleedthrough
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# test is the first test
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self.summary.append(
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"TEST-UNEXPECTED-FAIL | %s | Bleedthrough detected, this test is the root cause for many of the above failures" %
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self.contents['testsToRun'][0])
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status = -1
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else:
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self.summary.append(
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"\t\t%s failed with different error." % self.contents['testsToRun'][-1])
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status = -1
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return status
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def check_for_intermittent(self, options):
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"This method is used to check whether a test is an intermittent."
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if self.result[options.bisectChunk] == "PASS":
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self.summary.append(
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"\t\tThe test %s passed." %
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self.contents['testsToRun'][0])
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if self.repeat > 0:
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# loop is set to 1 to again run the single test.
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self.contents['loop'] = 1
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self.repeat -= 1
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return 0
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else:
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if self.failcount > 0:
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# -1 is being returned as the test is intermittent, so no need to bisect further.
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return -1
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# If the test does not fail even once, then proceed to next chunk for bisection.
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# loop is set to 2 to proceed on bisection.
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self.contents['loop'] = 2
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return 1
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elif self.result[options.bisectChunk] == "FAIL":
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self.summary.append(
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"\t\tThe test %s failed." %
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self.contents['testsToRun'][0])
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self.failcount += 1
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self.contents['loop'] = 1
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self.repeat -= 1
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# self.max_failures is the maximum number of times a test is allowed
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# to fail to be called an intermittent. If a test fails more than
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# limit set, it is a perma-fail.
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if self.failcount < self.max_failures:
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if self.repeat == 0:
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# -1 is being returned as the test is intermittent, so no need to bisect further.
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return -1
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return 0
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else:
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self.summary.append(
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"TEST-UNEXPECTED-FAIL | %s | Bleedthrough detected, this test is the root cause for many of the above failures" %
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self.contents['testsToRun'][0])
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return -1
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def print_summary(self):
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"This method is used to print the recorded summary."
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print "Bisection summary:"
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for line in self.summary:
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print line
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