[dmccoystephenson]

Stage B (unit-test expansion) cycle: two characterization tests are added for constructor and report() branches that had no coverage. Production code is unchanged.

Summary

• test_constructor_trims_the_base_url_application_and_key — a base URL, application and key padded with whitespace are shown to still yield POST /api/metrics, Authorization: Bearer k-123, "application":"MyGame" and a User-Agent ending (MyGame). Previously only a trailing slash and a blank key were exercised.
• test_report_drops_none_tags_and_stringifies_the_rest_before_adding_the_version — through the real report() path (not just _json), a None tag key and value are shown to be dropped, a non-string value stringified, and a {"version": None} tag shown not to suppress the program's own version.

No tracking issue — gap found during triage. One behavior found while scanning, the version tag being added even past MAX_TAGS, was deliberately not characterized here and is filed as #16, because the fix would be Java-visible.

Test plan

• python3 -m unittest -v locally — Ran 50 tests ... OK (48 before)
• CI Build matrix green on 3.8 / 3.10 / 3.12

Java parity

No Java-visible behavior changed (tests only).

This PR description was drafted during a Gardener session (https://github.com/Stephenson-Software/gardener).

🤖 Generated with Claude Code

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drafted by Claude on behalf of Daniel Stephenson

[dmccoystephenson]

Self-review rubric (one intrinsic pass, anchored on CI run 39014267037):

• Scope: PASS — git diff --stat origin/main shows only tests/test_trace_client.py, +19/-0; no production code, formatting or renames.
• Tests-new: PASS (N/A) — no new public names; the two added tests cover existing, previously unexercised branches of __init__ (strip of base_url/application/key) and of _with_version reached through report().
• Tests-fix: N/A — characterization cycle, no fix; production code is untouched. The distinguishing power of each assertion was checked by reading the code path: without .strip() the padded base URL would fail in urllib.request.Request (nothing arrives), the body would carry " MyGame ", and the header would be Bearer k-123, so each assertion would fail on an unstripped value.
• Sibling structure: PASS — both tests follow the neighbours' pattern (_Capture loopback server, arrived.wait(5), close() at the end, assertion messages naming the promise).
• Sibling renames: N/A — nothing renamed.
• Docs: PASS — the README/docstrings already describe trimming and that tags are copied; nothing in the Phase 7 table changes for a tests-only diff.
• Issue resolution: N/A — no Closes; the one behavior deliberately left uncharacterized (version tag past MAX_TAGS) is filed as The version tag is added even when it pushes an event past MAX_TAGS #16.
• CI: PASS — test (3.8), test (3.10), test (3.12) all green on the PR head.
• Stdlib-only: PASS — git diff origin/main | grep '^+.*import' is empty.
• Py3.8 floor: PASS — test (3.8) green.
• Never-raises / never-blocks, Log level, Version agreement, Exports: N/A — no production change; version string still 0.4.1 in all five places.
• Java parity noted: PASS — the PR body states no Java-visible behavior changed.

Findings:

• tests/test_trace_client.py:100 — the User-Agent check uses endswith("(MyGame)") rather than equality. This is weaker than the exact match in test_user_agent_names_the_client_version, but intentionally so: that test already pins the version prefix, and this one only asserts that the application name is trimmed. Left as-is; flagged as a judgment call.

Summary: tests-only, CI green across the matrix; ready for human review.

This review comment was drafted during a Gardener session (https://github.com/Stephenson-Software/gardener).

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drafted by Claude on behalf of Daniel Stephenson