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# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
import unittest
from unittest import mock
from azure.monitor.opentelemetry.exporter.export.trace._sampling import (
ApplicationInsightsSampler,
)
# pylint: disable=protected-access
class TestApplicationInsightsSampler(unittest.TestCase):
def test_constructor(self):
sampler = ApplicationInsightsSampler(0.75)
self.assertEqual(sampler._ratio, 0.75)
self.assertEqual(sampler._sample_rate, 75)
def test_invalid_ratio(self):
self.assertRaises(
ValueError, lambda: ApplicationInsightsSampler(1.01)
)
self.assertRaises(
ValueError, lambda: ApplicationInsightsSampler(-0.01)
)
@mock.patch.object(ApplicationInsightsSampler, '_get_DJB2_sample_score')
def test_should_sample(self, score_mock):
sampler = ApplicationInsightsSampler(0.75)
score_mock.return_value = 0.7
result = sampler.should_sample(None, 0, "test")
self.assertEqual(result.attributes["_MS.sampleRate"], 75)
self.assertTrue(result.decision.is_sampled())
@mock.patch.object(ApplicationInsightsSampler, '_get_DJB2_sample_score')
def test_should_sample_not_sampled(self, score_mock):
sampler = ApplicationInsightsSampler(0.5)
score_mock.return_value = 0.7
result = sampler.should_sample(None, 0, "test")
self.assertEqual(result.attributes["_MS.sampleRate"], 50)
self.assertFalse(result.decision.is_sampled())
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