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Fix TypeError when mutating Sample metadata. #6800

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Fix TypeError when mutating Sample metadata. #6800

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2 changes: 1 addition & 1 deletion perfkitbenchmarker/sample.py
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ def __new__(
timestamp = time.time()

metadata = metadata or {}
metadata = metadata.copy()
metadata = dict(metadata)
return super().__new__(
cls,
metric,
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11 changes: 11 additions & 0 deletions tests/sample_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@

import unittest

import immutabledict
from perfkitbenchmarker import sample


Expand Down Expand Up @@ -61,6 +62,16 @@ def testValuesShouldBeFloats(self):
self.assertIsInstance(instance.value, float)
self.assertEqual(1.0, instance.value)

def testImmutableMetadataConvertedToDict(self):
metadata = immutabledict.immutabledict({'origin': 'unit test'})
instance = sample.Sample(
metric='Test', value=1.0, unit='Mbps', metadata=metadata
)
self.assertIsInstance(instance.metadata, dict)
self.assertNotIsInstance(instance.metadata, immutabledict.immutabledict)
instance.metadata['new_key'] = 'new_value'
self.assertEqual(instance.metadata['new_key'], 'new_value')


class TestPercentileCalculator(unittest.TestCase):

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