class TestReliabilityCalculator(unittest.TestCase):
def setUp(self):
self.rc = ReliabilityCalculator()
self.rc.default_replication_time = 2.0
self.rc.default_mtbf = 10
def testReliabilityNoFailures(self):
failure_info = []
reliability = self.rc.calculate_reliability(failure_info, self.rc.default_replication_time)
assert (reliability == math.exp(-float(self.rc.default_replication_time) / self.rc.default_mtbf))
def testReliabilityOneFailure(self):
failure_info = [time.time()]
reliability = self.rc.calculate_reliability(failure_info, self.rc.default_replication_time)
assert (reliability == math.exp(-float(self.rc.default_replication_time) / self.rc.default_mtbf))
def testReliabilityTwoFailures(self):
t = time.time()
failure_info = [t, t + self.rc.default_mtbf]
reliability = self.rc.calculate_reliability(failure_info, self.rc.default_replication_time)
assert (reliability == math.exp(-float(self.rc.default_replication_time) / self.rc.default_mtbf))
def testReliabilityThreeFailures(self):
t = time.time()
failure_info = [t, t + 1.5 * self.rc.default_mtbf, t + 2 * self.rc.default_mtbf]
reliability = self.rc.calculate_reliability(failure_info, self.rc.default_replication_time)
assert (reliability == math.exp(-float(self.rc.default_replication_time) / self.rc.default_mtbf))
def testReplicationTimeConfidence(self):
rep_times = [10, 10, 20]
rep_time = self.rc.replication_time(rep_times)
rep_time
assert int(rep_time) == 21
assert self.rc.replication_time(rep_times, 0.99) > rep_time
assert self.rc.replication_time(rep_times, 1.0) == float('inf')
def setUp(self):
self.rc = ReliabilityCalculator()
self.rc.default_replication_time = 2.0
self.rc.default_mtbf = 10