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test: add error paths test for _add metric helper

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Co-authored-by: Horizontal42 <75383519+Horizontal42@users.noreply.github.com>
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google-labs-jules[bot] 2026-10-07 03:54:54 +00:00
parent 8c99ac78b7
commit 59a1f7823e
1 changed files with 13 additions and 1 deletions
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14
tests/test_metrics.py
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@ -1,6 +1,6 @@
from __future__ import annotations from __future__ import annotations
from netsleuth.metrics import Metric, collect_metrics, render_csv, render_prometheus from netsleuth.metrics import Metric, _add, collect_metrics, render_csv, render_prometheus
def _report(**overrides) -> dict: def _report(**overrides) -> dict:
@ -84,3 +84,15 @@ def test_render_csv_has_a_header_row_and_quotes_a_comma_in_a_label():
lines = text.strip().splitlines() lines = text.strip().splitlines()
assert lines[0] == "metric,labels,value" assert lines[0] == "metric,labels,value"
assert '"target=a, b"' in lines[1] assert '"target=a, b"' in lines[1]
def test_add_ignores_uncastable_values():
metrics: list[Metric] = []
# Uncastable string raises ValueError
_add(metrics, "test_metric", "abc")
assert len(metrics) == 0
# Incompatible type like dict raises TypeError
_add(metrics, "test_metric", {"some": "dict"})
assert len(metrics) == 0