def test_rate_is_correct_when_enough_samples(self):
"""
A RateMeasurer should correctly report the rate when enough
samples have been collected.
"""
r = RateMeasurer()
target_rate = 5
self.increase_rate(r, target_rate, r.sample_size)
self.assertEqual(target_rate, r.rate())
def test_rate_is_correct_when_enough_samples(self):
"""
A RateMeasurer should correctly report the rate when enough
samples have been collected.
"""
r = RateMeasurer()
target_rate = 5
self.increase_rate(r, target_rate, r.sample_size)
self.assertEqual(target_rate, r.rate())
def test_rate_is_lower_than_target_when_not_enough_samples(self):
"""
When the number of samples collected is less than the sample
size, the rate should be lower than `target_rate`.
"""
r = RateMeasurer()
target_rate = 5
num_samples = r.sample_size - 1
self.increase_rate(r, target_rate, num_samples)
self.assertTrue(r.rate() < target_rate)
def test_rate_is_lower_than_target_when_not_enough_samples(self):
"""
When the number of samples collected is less than the sample
size, the rate should be lower than `target_rate`.
"""
r = RateMeasurer()
target_rate = 5
num_samples = r.sample_size - 1
self.increase_rate(r, target_rate, num_samples)
self.assertTrue(r.rate() < target_rate)
def test_rate_only_considers_received_samples(self):
"""
The rate should be based on the number of received requests,
not the number of sent or failed requests.
"""
r = RateMeasurer()
send_request_rate = 100
failed_request_rate = 10
receive_request_rate = 5
self.send_requests(r, send_request_rate, r.sample_size)
self.failed_requests(r, failed_request_rate, r.sample_size)
self.receive_requests(r, receive_request_rate, r.sample_size)
self.assertEqual(receive_request_rate, r.rate())
def test_rate_only_considers_received_samples(self):
"""
The rate should be based on the number of received requests,
not the number of sent or failed requests.
"""
r = RateMeasurer()
send_request_rate = 100
failed_request_rate = 10
receive_request_rate = 5
self.send_requests(r, send_request_rate, r.sample_size)
self.failed_requests(r, failed_request_rate, r.sample_size)
self.receive_requests(r, receive_request_rate, r.sample_size)
self.assertEqual(receive_request_rate, r.rate())
def test_old_samples_are_not_considered(self):
"""
Old samples should be discarded, meaning that only `sample_size`
number of requests are considered for the rate, and when receiving
a new sample, the oldest one is discarded.
"""
r = RateMeasurer()
target_rate = 5
# Generate samples that will achieve a high request rate
self.increase_rate(r, target_rate * 2, r.sample_size)
# Generate samples to lower the request rate to the target rate
self.increase_rate(r, target_rate, r.sample_size)
self.assertEqual(target_rate, r.rate())
def test_old_samples_are_not_considered(self):
"""
Old samples should be discarded, meaning that only `sample_size`
number of requests are considered for the rate, and when receiving
a new sample, the oldest one is discarded.
"""
r = RateMeasurer()
target_rate = 5
# Generate samples that will achieve a high request rate
self.increase_rate(r, target_rate * 2, r.sample_size)
# Generate samples to lower the request rate to the target rate
self.increase_rate(r, target_rate, r.sample_size)
self.assertEqual(target_rate, r.rate())
def test_outstanding_considers_all_responses(self):
"""
Requests that fail are considered to be completed requests and
should be included when calculating the number of outstanding
requests.
"""
r = RateMeasurer()
# Send 25 requests
self.send_requests(r, 5, r.sample_size)
# Receive successful responses for 20 of those requests
self.receive_requests(r, 4, r.sample_size)
# Mark 5 of the requests as failed
self.failed_requests(r, 1, r.sample_size)
self.assertEqual(0, r.outstanding())
def test_outstanding_considers_all_responses(self):
"""
Requests that fail are considered to be completed requests and
should be included when calculating the number of outstanding
requests.
"""
r = RateMeasurer()
# Send 25 requests
self.send_requests(r, 5, r.sample_size)
# Receive successful responses for 20 of those requests
self.receive_requests(r, 4, r.sample_size)
# Mark 5 of the requests as failed
self.failed_requests(r, 1, r.sample_size)
self.assertEqual(0, r.outstanding())
def test_rate_is_zero_when_no_samples(self):
"""
When no samples have been collected, the rate should be 0.
"""
r = RateMeasurer()
self.assertEqual(r.rate(), 0, "Expected initial rate to be zero")
def test_rate_is_zero_when_no_samples(self):
"""
When no samples have been collected, the rate should be 0.
"""
r = RateMeasurer()
self.assertEqual(r.rate(), 0, "Expected initial rate to be zero")
