[
  {
    "description": "Missing required field 'beat_index'",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "downbeat": false,
      "phase": "execute",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["beat_index is required"]
  },
  {
    "description": "Invalid phase value",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "invalid_phase",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["phase must be one of: plan, execute, review"]
  },
  {
    "description": "Invalid HLC format (wrong number of segments)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["hlc must match pattern ^[0-9a-fA-F]{4}:[0-9a-fA-F]{4}:[0-9a-fA-F]{4}$"]
  },
  {
    "description": "Invalid HLC format (non-hex characters)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "gggg:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["hlc must match pattern ^[0-9a-fA-F]{4}:[0-9a-fA-F]{4}:[0-9a-fA-F]{4}$"]
  },
  {
    "description": "Invalid window_id format (too short)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d"
    },
    "expected_errors": ["window_id must be exactly 32 hex characters"]
  },
  {
    "description": "Invalid tempo_bpm (too low)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 0.05,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["tempo_bpm must be at least 0.1"]
  },
  {
    "description": "Invalid tempo_bpm (too high)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 1001.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["tempo_bpm must be at most 1000"]
  },
  {
    "description": "Invalid beat_index (negative)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": -1,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["beat_index must be >= 0"]
  },
  {
    "description": "Wrong message type",
    "message": {
      "type": "backbeat.wrongtype.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5"
    },
    "expected_errors": ["type must be 'backbeat.beatframe.v1'"]
  },
  {
    "description": "Extra unknown properties (should fail with additionalProperties: false)",
    "message": {
      "type": "backbeat.beatframe.v1",
      "cluster_id": "test",
      "beat_index": 0,
      "downbeat": false,
      "phase": "plan",
      "hlc": "7ffd:0001:abcd",
      "deadline_at": "2025-09-05T12:00:00Z",
      "tempo_bpm": 2.0,
      "window_id": "7e9b0e6c4c9a4e59b7f2d9a3c1b2e4d5",
      "unknown_field": "should not be allowed"
    },
    "expected_errors": ["Additional property unknown_field is not allowed"]
  }
]