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import { describe, expect, it } from "vitest";
import { initialState, reduce, type ChatState } from "./reducer";
import type { ServerMessage } from "./protocol";
function afterServer(
state: ChatState,
...messages: ServerMessage[]
): ChatState {
return messages.reduce(
(s, message) => reduce(s, { type: "server", message }),
state,
);
}
describe("reduce", () => {
it("stores the session and goes online on hello", () => {
const state = afterServer(initialState, {
type: "hello",
sessionId: "s1",
turnActive: true,
});
expect(state.sessionId).toBe("s1");
expect(state.connection).toBe("online");
expect(state.turnActive).toBe(true);
});
it("resets the thread on hello so reconnect replays are idempotent", () => {
let state = afterServer(
initialState,
{ type: "hello", sessionId: "s1" },
{ type: "user_message", text: "hi" },
);
expect(state.thread).toHaveLength(1);
state = afterServer(
state,
{ type: "hello", sessionId: "s1" },
{ type: "user_message", text: "hi" },
);
expect(state.thread).toHaveLength(1);
});
it("appends user messages to the thread", () => {
const state = afterServer(initialState, {
type: "user_message",
text: "do the thing",
});
expect(state.thread).toEqual([{ kind: "user", text: "do the thing" }]);
});
it("accumulates agent chunks into one open item", () => {
const chunk = (text: string): ServerMessage => ({
type: "session_update",
update: {
sessionUpdate: "agent_message_chunk",
content: { type: "text", text },
},
});
const state = afterServer(initialState, chunk("Hello "), chunk("world"));
expect(state.thread).toEqual([
{ kind: "agent", text: "Hello world", closed: false },
]);
});
it("starts a fresh agent item after the turn ends", () => {
const chunk = (text: string): ServerMessage => ({
type: "session_update",
update: {
sessionUpdate: "agent_message_chunk",
content: { type: "text", text },
},
});
const state = afterServer(
initialState,
chunk("first answer"),
{ type: "turn_ended", stopReason: "end_turn" },
chunk("second answer"),
);
expect(state.thread).toHaveLength(2);
expect(state.thread[0]).toMatchObject({
kind: "agent",
text: "first answer",
closed: true,
});
expect(state.thread[1]).toMatchObject({
kind: "agent",
text: "second answer",
closed: false,
});
});
it("tracks the turn flag through markers", () => {
let state = afterServer(initialState, { type: "turn_started" });
expect(state.turnActive).toBe(true);
state = afterServer(state, { type: "turn_ended", stopReason: "end_turn" });
expect(state.turnActive).toBe(false);
});
it("renders server errors as thread items", () => {
const state = afterServer(initialState, { type: "error", message: "boom" });
expect(state.thread).toEqual([{ kind: "error", text: "boom" }]);
});
it("ignores unknown update kinds without breaking", () => {
const state = afterServer(initialState, {
type: "session_update",
update: { sessionUpdate: "something_new" },
});
expect(state.thread).toEqual([]);
});
it("accumulates thought chunks separately from agent messages", () => {
const state = afterServer(
initialState,
{
type: "session_update",
update: {
sessionUpdate: "agent_thought_chunk",
content: { type: "text", text: "hmm " },
},
},
{
type: "session_update",
update: {
sessionUpdate: "agent_thought_chunk",
content: { type: "text", text: "ok" },
},
},
{
type: "session_update",
update: {
sessionUpdate: "agent_message_chunk",
content: { type: "text", text: "Answer" },
},
},
);
expect(state.thread).toHaveLength(2);
expect(state.thread[0]).toMatchObject({ kind: "thought", text: "hmm ok" });
expect(state.thread[1]).toMatchObject({ kind: "agent", text: "Answer" });
});
it("creates a tool call and merges its updates", () => {
let state = afterServer(initialState, {
type: "session_update",
update: {
sessionUpdate: "tool_call",
toolCallId: "call-1",
title: "Reading files",
kind: "read",
status: "pending",
locations: [{ path: "/p/main.go" }],
},
});
expect(state.thread).toEqual([
{
kind: "tool",
call: {
toolCallId: "call-1",
title: "Reading files",
toolKind: "read",
status: "pending",
contents: [],
locations: [{ path: "/p/main.go" }],
},
},
]);
state = afterServer(state, {
type: "session_update",
update: {
sessionUpdate: "tool_call_update",
toolCallId: "call-1",
status: "completed",
content: [
{ type: "content", content: { type: "text", text: "42 lines" } },
],
},
});
expect(state.thread).toHaveLength(1);
const item = state.thread[0];
if (item.kind !== "tool") throw new Error("expected a tool item");
expect(item.call.status).toBe("completed");
expect(item.call.title).toBe("Reading files");
expect(item.call.contents).toHaveLength(1);
});
it("creates a tool item when an update arrives for an unknown id", () => {
const state = afterServer(initialState, {
type: "session_update",
update: {
sessionUpdate: "tool_call_update",
toolCallId: "ghost",
status: "in_progress",
},
});
expect(state.thread).toHaveLength(1);
expect(state.thread[0]).toMatchObject({
kind: "tool",
call: { toolCallId: "ghost", status: "in_progress" },
});
});
it("replaces the plan on each plan update", () => {
let state = afterServer(initialState, {
type: "session_update",
update: {
sessionUpdate: "plan",
entries: [{ content: "step 1", priority: "high", status: "pending" }],
},
});
expect(state.plan).toHaveLength(1);
state = afterServer(state, {
type: "session_update",
update: {
sessionUpdate: "plan",
entries: [
{ content: "step 1", priority: "high", status: "completed" },
{ content: "step 2", priority: "low", status: "pending" },
],
},
});
expect(state.plan).toHaveLength(2);
expect(state.plan[0].status).toBe("completed");
});
it("tracks permission requests until they are resolved", () => {
let state = afterServer(initialState, {
type: "permission_request",
requestId: "perm-1",
request: {
toolCall: { title: "Run make test" },
options: [{ optionId: "allow", name: "Allow", kind: "allow_once" }],
},
});
expect(state.permissions).toEqual([
{
requestId: "perm-1",
title: "Run make test",
options: [{ optionId: "allow", name: "Allow", kind: "allow_once" }],
},
]);
// replayed duplicates are ignored
state = afterServer(state, {
type: "permission_request",
requestId: "perm-1",
request: { options: [] },
});
expect(state.permissions).toHaveLength(1);
state = afterServer(state, {
type: "permission_resolved",
requestId: "perm-1",
});
expect(state.permissions).toEqual([]);
});
it("clears plan and permissions on hello", () => {
let state = afterServer(
initialState,
{
type: "permission_request",
requestId: "perm-1",
request: { options: [] },
},
{
type: "session_update",
update: {
sessionUpdate: "plan",
entries: [{ content: "x", priority: "low", status: "pending" }],
},
},
);
state = afterServer(state, { type: "hello", sessionId: "s1" });
expect(state.permissions).toEqual([]);
expect(state.plan).toEqual([]);
});
it("stores the agent's available commands and clears them on hello", () => {
let state = reduce(initialState, {
type: "server",
message: {
type: "session_update",
update: {
sessionUpdate: "available_commands_update",
availableCommands: [
{ name: "review", description: "Review changes" },
{ name: "compact", description: "Summarise", input: { hint: "x" } },
],
},
},
});
expect(state.commands.map((c) => c.name)).toEqual(["review", "compact"]);
state = reduce(state, {
type: "server",
message: { type: "hello", sessionId: "s2" },
});
expect(state.commands).toEqual([]);
});
it("tracks connection status changes", () => {
const state = reduce(initialState, {
type: "connection",
status: "offline",
});
expect(state.connection).toBe("offline");
});
it("never mutates the previous state", () => {
const before = afterServer(initialState, {
type: "user_message",
text: "a",
});
const snapshot = JSON.parse(JSON.stringify(before));
afterServer(
before,
{ type: "user_message", text: "b" },
{ type: "turn_started" },
);
expect(before).toEqual(snapshot);
});
});
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