{
    "description": "Codex family: blank (empty or whitespace-only) data.id values are not stream identities (shared/src/messages.ts trims before accepting) — each payload keeps its own row-derived block id instead of collapsing onto a shared blank identity.",
    "expected": {
        "blocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-codex-065:0",
                "kind": "agent-reasoning",
                "localId": null,
                "text": "blank id one"
            },
            {
                "createdAt": 1755000000100,
                "id": "msg-codex-066:0",
                "kind": "agent-reasoning",
                "localId": null,
                "text": "blank id two"
            },
            {
                "createdAt": 1755000000200,
                "id": "msg-codex-067:0",
                "kind": "agent-text",
                "localId": null,
                "text": "blank id text one"
            },
            {
                "createdAt": 1755000000300,
                "id": "msg-codex-068:0",
                "kind": "agent-text",
                "localId": null,
                "text": "blank id text two"
            }
        ],
        "hasReadyEvent": false,
        "latestUsage": null,
        "visibleBlocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-codex-065:0",
                "kind": "agent-reasoning",
                "localId": null,
                "text": "blank id one"
            },
            {
                "createdAt": 1755000000100,
                "id": "msg-codex-066:0",
                "kind": "agent-reasoning",
                "localId": null,
                "text": "blank id two"
            },
            {
                "createdAt": 1755000000200,
                "id": "msg-codex-067:0",
                "kind": "agent-text",
                "localId": null,
                "text": "blank id text one"
            },
            {
                "createdAt": 1755000000300,
                "id": "msg-codex-068:0",
                "kind": "agent-text",
                "localId": null,
                "text": "blank id text two"
            }
        ]
    },
    "fixtureVersion": 1,
    "input": {
        "agentState": null,
        "messages": [
            {
                "content": {
                    "content": {
                        "data": {
                            "id": "",
                            "message": "blank id one",
                            "type": "reasoning"
                        },
                        "type": "codex"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000000000,
                "id": "msg-codex-065",
                "localId": null,
                "seq": 1
            },
            {
                "content": {
                    "content": {
                        "data": {
                            "id": "   ",
                            "message": "blank id two",
                            "type": "reasoning"
                        },
                        "type": "codex"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000000100,
                "id": "msg-codex-066",
                "localId": null,
                "seq": 2
            },
            {
                "content": {
                    "content": {
                        "data": {
                            "id": "",
                            "message": "blank id text one",
                            "type": "message"
                        },
                        "type": "codex"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000000200,
                "id": "msg-codex-067",
                "localId": null,
                "seq": 3
            },
            {
                "content": {
                    "content": {
                        "data": {
                            "id": "   ",
                            "message": "blank id text two",
                            "type": "message"
                        },
                        "type": "codex"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000000300,
                "id": "msg-codex-068",
                "localId": null,
                "seq": 4
            }
        ],
        "options": {
            "hasMoreMessages": false
        }
    },
    "name": "codex-blank-stream-ids"
}