# Calendar event, meeting, recurrence

**Test family:** `CAL`

- **CAL-001** Create all-day and timed events; start/end exclusivity and overnight/multi-day rendering are correct.
- **CAL-002** Organizer, attendee, optional attendee, resource, and external guest permissions/statuses differ correctly.
- **CAL-003** Accept/decline/tentative and concurrent responses update once and notify the right parties.
- **CAL-004** Recurrence handles daily/weekly/monthly/yearly, interval, weekdays, month end, leap day, count, until, and no end.
- **CAL-005** Edit/delete this occurrence, this-and-following, and whole series without corrupting exceptions.
- **CAL-006** Organizer/attendee time zones and DST changes preserve intended local meeting times.
- **CAL-007** Conflict, double booking, free/busy privacy, reminder timing, and external calendar sync are truthful.
- **CAL-008** Cancelled/rescheduled events preserve audit and do not continue old reminders/links.

## Comprehensive per-item coverage

- **CAL-009** Exercise absent, null, empty, zero, false, ordinary, minimum, maximum, below-minimum, above-maximum, and unknown values distinctly.
- **CAL-010** Probe powers-of-two and representation boundaries around `7/8/9`, `15/16/17`, `31/32/33`, `63/64/65`, and storage-specific limits.
- **CAL-011** Use negative, fractional, high-precision, exponential, signed-zero, NaN/infinity, overflow, underflow, and rounding cases where the type can receive them.
- **CAL-012** Use labels or serialized values containing emoticons, emoji, kaomoji, accents, RTL, combining marks, confusables, and invisible characters.
- **CAL-013** Compare UI, API, import, database, cache, queue, analytics, search index, notification, and export representations; preserve one authoritative meaning.
- **CAL-014** Send wrong types, missing fields, extra fields, duplicate keys, unknown enum members, malformed encodings, and schema-version mismatches.
- **CAL-015** Bypass client min/max/step/format constraints; enforce the server and persistence contract without clipping or coercing silently.
- **CAL-016** Switch locale, numbering system, decimal/group separator, calendar, currency, time zone, and direction; separate display formatting from stored value.
- **CAL-017** Sort, filter, group, aggregate, compare, search, paginate, and chart boundary and null values; keep ordering and totals coherent.
- **CAL-018** Create and update concurrently from two sessions; prevent lost updates, duplicate identities, and stale derived values.
- **CAL-019** Retry writes and reads across timeout, disconnect, failover, and replica lag; expose stale or uncertain state rather than false certainty.
- **CAL-020** Migrate old, missing, malformed, and newly extended values forward and backward where supported; preserve auditability and rollback.
- **CAL-021** Verify permissions at field, record, tenant, export, analytics, log, cache, and backup layers; redact consistently.
- **CAL-022** Use inert markup, SQL, template, CSV-formula, path, and log canaries in any textual representation; encode for each output context.
- **CAL-023** Check accessible names, units, errors, table headers, announcements, and non-color distinctions for input and display.
- **CAL-024** Measure validation, calculation, query, sort, aggregate, import, and export behavior at normal and supported scale.
- **CAL-025** Verify derived totals, counters, scores, dates, and statuses update atomically with source data or expose reconciliation state.
- **CAL-026** Delete, restore, archive, expire, retain, and purge values; distinguish tombstone, null, zero, redaction, and absence.
- **CAL-027** Record source, actor, old/new value, unit, time, version, and reason without leaking secrets or prohibited personal data.
- **CAL-028** Reconcile after partial failure, cache corruption, duplicate message, and delayed index update; detect and repair divergence.

[Back to Numbers, money, dates, and time index](../../numbers-money-time.md)
