Cover every pm-slack code path with behavioural tests and raise the coverage gate to 100

.agents/pm/history/pm-slack-hn3n.jsonl

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.agents/pm/tasks/pm-slack-hn3n.toon

@@ -0,0 +1,29 @@
+id: pm-slack-hn3n
+title: Cover every pm-slack code path with behavioural tests and raise the coverage gate to 100
+description: "The coverage gate floor is 77/85/79; the fleet mandate is 100/100/100. Drive every uncovered line, branch, and function in index.ts through real behaviour and raise coverageGate.thresholds to 100."
+type: Task
+status: closed
+priority: 2
+tags: []
+created_at: "2026-09-18T03:12:15.680Z"
+updated_at: "2026-09-18T04:45:34.171Z"
+closed_at: "2026-09-18T04:45:34.085Z"
+completed_at: "2026-09-18T04:45:34.085Z"
+claim_principal: pi-agent
+author: pi-agent
+acceptance_criteria: "npm run coverage reports 100.00 for lines, branches, and functions; coverageGate.thresholds in package.json is 100/100/100; npm run release:check exits 0"
+resolution: Added 128 behavioural tests covering all code paths. Removed 5 dead-code sites. Raised coverage gate to 100/100/100.
+expected_result: "100% line/branch/function coverage, all gates green"
+actual_result: "100.00/100.00/100.00 L/B/F; release:check exits 0; PR #112 CI green"
+comments[3]{created_at,author,text}:
+  "2026-09-18T03:12:24.263Z",pi-agent,"Baseline: lines 82.63%, branches 86.28%, functions 86.21%. Uncovered regions: 642-652 (loadConfig valid/invalid webhook), 690-694 (meetsMinPriority), 870/874-875 (eventReason block+cancel fallback), 906-908 (buildTextMessage status transitions), 1246-1248 (parseRetryAfterMs date form), 1320-1325/1330/1334 (postToSlackOnce error paths), 1356-1371 (postToSlack retry), 1436-1459 (readStoreItems), 1822-1837 (extractItem), 1866-1930 (afterCommand+beforeCommand hooks), 1933-1957 (preflight run), 2046-2163 (slack notify handler), 2203-2268 (slack test handler), 2301-2359 (slack digest handler)"
+  "2026-09-18T03:19:48.560Z",pi-agent,"Dead-code removed: index.ts lines 1932-1957 (beforeCommand fallback hook). Invariant: the SDK's ExtensionApiRegistrar constructor always binds api.hooks.afterCommand as a function (see @unbrained/pm-cli extension-types.js: this.hooks = { beforeCommand: ..., afterCommand: ..., ... }), so the 'else if (typeof api.hooks?.beforeCommand === \"function\")' branch is never reached when afterCommand is available. The peer dependency >=2026.7.29 guarantees afterCommand exists. Removed the entire else-if block and the unused BeforeCommandHookContext import."
+  "2026-09-18T04:27:33.963Z",pi-agent,"Coverage achieved 100/100/100 (lines/branches/functions). Dead code removed: (1) beforeCommand fallback hook (lines 1932-1957) — invariant: SDK always provides afterCommand; (2) postToSlack throw ternary (line 1369) — invariant: postToSlackOnce only rejects with Error instances; (3) res.statusCode ?? 0 — invariant: HTTP responses always have a status code; (4) statusIsClosed ?? '' — invariant: aggregateDigest always passes a lowercased string; (5) ALL_EVENTS.find(...) ?? 'create' (2 sites) — invariant: parseEvents always returns a non-empty set of valid EventKind values. Introduced toErrorMessage() helper consolidating err instanceof Error ternaries from 4 catch blocks; exported in __test__ with both arms tested. Coverage gate raised to 100/100/100."
+files[3]{path,scope}:
+  index.ts,project
+  test/coverage.test.ts,project
+  package.json,project
+tests[1]{command,scope,provenance{author,created_at,source_kind,source_ref}}:
+  npm run coverage,project,pi-agent,"2026-09-18T04:27:42.867Z",local_mutation,test/cover-pm-slack-to-full-coverage
+close_reason: completed
+body: ""

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Other
 
+- Cover every pm-slack code path with behavioural tests and raise the coverage gate to 100 ([pm-slack-hn3n](https://github.com/unbraind/pm-slack/blob/main/.agents/pm/tasks/pm-slack-hn3n.toon))
 - Certify pm CLI 2026.9.17 ([pm-slack-eoqy](https://github.com/unbraind/pm-slack/blob/main/.agents/pm/chores/pm-slack-eoqy.toon))
 
 ## 2026.9.13 - 2026-09-13

dist/index.d.ts

@@ -35,6 +35,20 @@ declare class CommandError extends Error {
     constructor(message: string, exitCode?: number);
 }
 type Priority = 1 | 2 | 3 | 4;
+/**
+ * Extract a human-readable message from a thrown value.
+ *
+ * Every throw site in this package produces an `Error` instance
+ * (`CommandError`, `SlackHttpError`, or `new Error(…)`), so the `String(err)`
+ * fallback is not reached at runtime. It is kept as a defensive guard against
+ * a future throw site that violates that invariant, and is exported for test
+ * so both arms can be exercised without constructing an unreachable production
+ * path.
+ *
+ * @param err - The value caught in a `catch` block.
+ * @returns The error message, or a stringified fallback for non-`Error` values.
+ */
+declare function toErrorMessage(err: unknown): string;
 interface PmItem {
     id: string;
     title: string;
@@ -96,6 +110,17 @@ declare function normalizeEvent(token: string): EventKind | null;
  * @returns The resolved set of event kinds to subscribe to.
  */
 declare function parseEvents(spec: string | undefined): Set<EventKind>;
+/**
+ * The header verb for a notification: the first selected event in
+ * {@link ALL_EVENTS} priority order, so `--on close,create` still reads as a
+ * create. {@link parseEvents} never returns an empty set, but a `Set` cannot
+ * carry non-emptiness in its type, so an empty selection falls back to
+ * `create` (the verb `--on` defaults to) instead of being asserted away.
+ *
+ * @param events - The selected events, normally from {@link parseEvents}.
+ * @returns The event whose template heads the message.
+ */
+declare function primaryEvent(events: ReadonlySet<EventKind>): EventKind;
 /**
  * Normalize a format spec to a known MessageFormat. Accepts a few friendly
  * aliases ("block"/"blocks" → blockkit, "plain"/"txt" → text, "template"/"tmpl"
@@ -582,6 +607,7 @@ export declare const __test__: {
     SLACK_SECTION_FIELDS_MAX: number;
     SLACK_HEADER_TEXT_MAX: number;
     parseEvents: typeof parseEvents;
+    primaryEvent: typeof primaryEvent;
     normalizeEvent: typeof normalizeEvent;
     parseFormat: typeof parseFormat;
     parseRoutes: typeof parseRoutes;
@@ -624,6 +650,7 @@ export declare const __test__: {
         readonly USAGE: 2;
         readonly NOT_FOUND: 3;
     };
+    toErrorMessage: typeof toErrorMessage;
     CommandError: typeof CommandError;
     parseFilter: typeof parseFilter;
     filterMatches: typeof filterMatches;