Negative Test Matrix (Reserved/Invalid Values)
Scope: Gap 8.2.3 – expand negative coverage across MIDI 2.0 decoders/encoders.
Status: 🟡 In Progress (stream section seeded; remaining message families pending).
| Area | Spec Ref | Cases Added | Outcome |
|---|---|---|---|
| Stream – Endpoint Info | M2-104-UM Fig.13 | Reserved numberOfFunctionBlocks > 0x20 |
Rejected (Swift + TS) |
| Stream – Stream Config | M2-104-UM Fig.18/19 | Reserved flag bits set | Rejected (TS; Swift covered via StreamReservedBitsTests) |
| Stream – Function Block Info | M2-104-UM Fig.22 | Reserved midi1Bandwidth=3, reserved bits |
Rejected (Swift + TS) |
| Stream – Reserved bit in mt=0xF word | M2-104-UM §5.1 | Low reserved bit set | Rejected (TS) |
| Utility – Groupless + status | M2-104-UM §5.1 | Group nibble non-zero; unsupported status | Rejected (Swift + TS) |
| Utility – No-op payload | M2-104-UM §5.1 | No-op carrying non-zero data | Rejected (Swift + TS) |
| Utility – Delta clockstamp (unsupported) | M2-104-UM §5.1 | Status 0x03/0x04 treated as unsupported | Rejected (TS) |
| SysEx7/SysEx8 – Oversize payload | M2-104-UM §4.2 | Payload > 0xFFFF | Rejected (Swift + TS) |
| SysEx7/SysEx8 – Invalid status/count/empty | M2-104-UM §4.2 | Status nibble outside 0–3; count nibble > max; empty payload | Rejected (Swift + TS) |
| UMP Message Type – Reserved nibble | M2-104-UM §5 | MT outside {0,1,2,3,4,5,13,15} | Rejected (TS) |
| Flex – Tempo / Time Signature | Flex spec | BPM < 1; denominatorPow2 > 0x1F | Rejected (TS; Swift validated via throwing inits) |
| Flex – Payload bounds | Flex spec | Tempo > 16.16 max; text/ruby/lyric/chord/key >12 bytes; metronome accent >10 bytes | Rejected (Swift + TS) |
| Flex – Unknown status within class | Flex spec | Unrecognised status values in class 0x10/0x11 | Rejected (Swift + TS) |
| MIDI-CI Process Inquiry | M2-101-UM v1.2 | Invalid command byte; length overrun | Rejected (Swift throwing validator) |
| MIDI-CI Profiles Details | M2-102-U v1.1 Table 6 | Missing profileId in details inquiry; unsupported setOn | Rejected (Swift replies disabled/empty) |
| MIDI-CI Profiles Details (targets) | M2-102-U v1.1 Table 6 | Target missing on setOn/Off; channel count overflow | Rejected (Swift drops request) |
| Flex – Reserved status class | Flex spec | Status class ≠ 0x10 | Rejected (Swift + TS) |
| MIDI 1 Ch Voice – Data bounds | MIDI 1.0 | Data bytes >0x7F, invalid statuses | Rejected (Swift + TS) |
| MIDI 2 Ch Voice – Unsupported status/data | M2-104-UM §7 | Status nibble undefined; note/controller > 0x7F; per-note assignable invalid note | Rejected (Swift decode nil; TS RangeError) |
| MIDI 2 System – Unsupported status/data | M2-104-UM §5.2 | Status outside allowed set; data1/data2 > 0x7F | Rejected (Swift decode nil; TS RangeError) |
| MIDI 2 Per-note Management – Invalid note | M2-104-UM §7.4 | Note > 0x7F | Rejected (Swift decode nil) |
| MIDI-CI Profiles – Channel/target bounds | M2-102-U v1.1 | Channel count overflow; invalid target nibble | Rejected (Swift decode nil/empty; TS envelope drops) |
| Process Inquiry – messageDataControl | M2-101-UM v1.2 | messageDataControl not in {0x00,0x01,0x7F} | Rejected (Swift + TS) |
Next Targets
- Utility reserved opcodes and out-of-range fields (beyond group/status already covered).
- MIDI-CI Process Inquiry/profile/detail negative cases.
Usage Notes
- Swift: see
Tests/MIDI2Tests/NegativeTests/StreamNegativeTests.swift. - TypeScript: see
midi2.js/src/__tests__/negative.test.ts.