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import { describe, expect, it } from "vitest";
import { explodeTurn, explodeUserText, groupRowsToMessages } from "../../src/chunks/transform.js";
import type { Chunk, ChunkRow, ChunkRowDraft } from "../../src/types/index.js";
// These tests cover the pure explode/group transforms — the heart of the flat
// chunk-log storage model. No DB is required.
/** Promote drafts to rows with synthetic seq/id/createdAt (as appendChunks would). */
function toRows(drafts: ChunkRowDraft[], tabId = "tab-1", startSeq = 0): ChunkRow[] {
return drafts.map((d, i) => ({
id: `c${i}`,
tabId,
seq: startSeq + i,
turnId: d.turnId,
step: d.step,
role: d.role,
type: d.type,
data: d.data,
createdAt: 1000 + i,
}));
}
describe("explodeTurn", () => {
it("splits a tool-batch into separate tool_call (assistant) and tool_result (tool) rows", () => {
const chunks: Chunk[] = [
{ type: "thinking", text: "hmm", metadata: { anthropic: { signature: "S" } } },
{ type: "text", text: "let me read" },
{
type: "tool-batch",
calls: [
{ id: "a1", name: "read_file", arguments: { path: "x" }, result: "X", isError: false },
{ id: "a2", name: "read_file", arguments: { path: "y" }, result: "Y", isError: false },
],
},
];
const drafts = explodeTurn("turn-1", chunks);
// thinking, text, tool_call×2 (assistant), tool_result×2 (tool)
expect(drafts.map((d) => `${d.role}/${d.type}`)).toEqual([
"assistant/thinking",
"assistant/text",
"assistant/tool_call",
"assistant/tool_call",
"tool/tool_result",
"tool/tool_result",
]);
// All in the same step (one round-trip).
expect(drafts.every((d) => d.step === 0)).toBe(true);
expect(drafts.every((d) => d.turnId === "turn-1")).toBe(true);
});
it("increments step after each tool-batch (multi-step turn)", () => {
const chunks: Chunk[] = [
{ type: "text", text: "s0" },
{ type: "tool-batch", calls: [{ id: "a", name: "t", arguments: {}, result: "r" }] },
{ type: "text", text: "s1" },
{ type: "tool-batch", calls: [{ id: "b", name: "t", arguments: {}, result: "r" }] },
{ type: "text", text: "final" },
];
const drafts = explodeTurn("turn-1", chunks);
const byStep = (s: number) => drafts.filter((d) => d.step === s).map((d) => d.type);
expect(byStep(0)).toEqual(["text", "tool_call", "tool_result"]);
expect(byStep(1)).toEqual(["text", "tool_call", "tool_result"]);
expect(byStep(2)).toEqual(["text"]); // trailing final-step text, no tool-batch
});
it("omits tool_result rows for calls without a result", () => {
const chunks: Chunk[] = [
{ type: "tool-batch", calls: [{ id: "a", name: "t", arguments: {} }] },
];
const drafts = explodeTurn("turn-1", chunks);
expect(drafts.map((d) => d.type)).toEqual(["tool_call"]);
});
});
describe("groupRowsToMessages (round-trip)", () => {
it("reconstructs a user message then an assistant message with a per-step tool-batch", () => {
const rows = [
...toRows(explodeUserText("turn-1", "hello"), "tab-1", 0),
...toRows(
explodeTurn("turn-1", [
{ type: "text", text: "reading" },
{
type: "tool-batch",
calls: [
{
id: "a1",
name: "read_file",
arguments: { path: "x" },
result: "X",
isError: false,
},
],
},
{ type: "text", text: "done" },
]),
"tab-1",
1,
),
];
const msgs = groupRowsToMessages(rows);
expect(msgs.map((m) => m.role)).toEqual(["user", "assistant"]);
expect(msgs[0]?.chunks).toEqual([{ type: "text", text: "hello" }]);
const a = msgs[1];
if (!a) throw new Error("no assistant message");
// reconstructed: text, tool-batch(step0), text(step1)
expect(a.chunks.map((c) => c.type)).toEqual(["text", "tool-batch", "text"]);
const batch = a.chunks.find((c) => c.type === "tool-batch");
if (batch?.type !== "tool-batch") throw new Error("no batch");
expect(batch.calls[0]).toMatchObject({
id: "a1",
name: "read_file",
arguments: { path: "x" },
result: "X",
isError: false,
});
});
it("keeps each step's tool calls in its own tool-batch chunk", () => {
const rows = toRows(
explodeTurn("turn-1", [
{ type: "tool-batch", calls: [{ id: "a", name: "t", arguments: {}, result: "ra" }] },
{ type: "tool-batch", calls: [{ id: "b", name: "t", arguments: {}, result: "rb" }] },
]),
);
const msgs = groupRowsToMessages(rows);
expect(msgs).toHaveLength(1);
const batches = msgs[0]?.chunks.filter((c) => c.type === "tool-batch") ?? [];
expect(batches).toHaveLength(2);
});
it("round-trips a multi-step assistant turn back to its original chunk shape", () => {
const original: Chunk[] = [
{ type: "thinking", text: "plan", metadata: { anthropic: { signature: "S" } } },
{ type: "text", text: "step0" },
{
type: "tool-batch",
calls: [
{ id: "a", name: "read_file", arguments: { path: "p" }, result: "R", isError: false },
],
},
{ type: "text", text: "final" },
];
const rows = toRows(explodeTurn("turn-1", original));
const msgs = groupRowsToMessages(rows);
expect(msgs).toHaveLength(1);
expect(msgs[0]?.chunks).toEqual(original);
});
it("tolerates an orphan tool_result whose tool_call was paged out", () => {
const rows = toRows([
{
turnId: "turn-1",
step: 0,
role: "tool",
type: "tool_result",
data: { callId: "z", name: "t", result: "R", isError: false },
},
]);
const msgs = groupRowsToMessages(rows);
expect(msgs).toHaveLength(1);
const batch = msgs[0]?.chunks[0];
if (batch?.type !== "tool-batch") throw new Error("no batch");
expect(batch.calls[0]).toMatchObject({ id: "z", result: "R" });
});
it("breaks the assistant grouping on a user or system row", () => {
const rows = [
...toRows(explodeUserText("t1", "q1"), "tab", 0),
...toRows(explodeTurn("t1", [{ type: "text", text: "a1" }]), "tab", 1),
...toRows(explodeUserText("t2", "q2"), "tab", 2),
...toRows(explodeTurn("t2", [{ type: "system", kind: "notice", text: "n" }]), "tab", 3),
];
const msgs = groupRowsToMessages(rows);
expect(msgs.map((m) => m.role)).toEqual(["user", "assistant", "user", "system"]);
});
});
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