test_all_empty_tags_return_an_empty_list (test_normalize_tags.TagNormalizationAcceptance.test_all_empty_tags_return_an_empty_list) ... FAIL
test_trims_lowercases_deduplicates_and_drops_empty_tags (test_normalize_tags.TagNormalizationAcceptance.test_trims_lowercases_deduplicates_and_drops_empty_tags) ... FAIL

======================================================================
FAIL: test_all_empty_tags_return_an_empty_list (test_normalize_tags.TagNormalizationAcceptance.test_all_empty_tags_return_an_empty_list)
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Traceback (most recent call last):
  File "/workspace/scratch/763ddcfd142e/red-green-witness/test_normalize_tags.py", line 11, in test_all_empty_tags_return_an_empty_list
    self.assertEqual(normalize_tags(["", " ", "\t"]), [])
AssertionError: Lists differ: ['', ' ', '\t'] != []

First list contains 3 additional elements.
First extra element 0:
''

- ['', ' ', '\t']
+ []

======================================================================
FAIL: test_trims_lowercases_deduplicates_and_drops_empty_tags (test_normalize_tags.TagNormalizationAcceptance.test_trims_lowercases_deduplicates_and_drops_empty_tags)
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Traceback (most recent call last):
  File "/workspace/scratch/763ddcfd142e/red-green-witness/test_normalize_tags.py", line 8, in test_trims_lowercases_deduplicates_and_drops_empty_tags
    self.assertEqual(normalize_tags([" AI ", "ai", "", "Tools"]), ["ai", "tools"])
AssertionError: Lists differ: [' AI ', 'ai', '', 'Tools'] != ['ai', 'tools']

First differing element 0:
' AI '
'ai'

First list contains 2 additional elements.
First extra element 2:
''

- [' AI ', 'ai', '', 'Tools']
+ ['ai', 'tools']

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Ran 2 tests in 0.001s

FAILED (failures=2)
