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hermes-agent/apps/desktop/src/store/composer-input-history.test.ts
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TypeScript

import { beforeEach, describe, expect, it } from 'vitest'
import {
$perSessionBrowse,
browseBackward,
browseForward,
deriveUserHistory,
isBrowsingHistory,
resetBrowseState
} from './composer-input-history'
const SESSION_A = 'session-a'
const SESSION_B = 'session-b'
// Newest-first user text ring, what the caller passes to browse*.
const HISTORY = ['third', 'second', 'first']
const MSG = (role: string, text: string) => ({ id: '', role, text })
beforeEach(() => {
$perSessionBrowse.set({})
})
describe('deriveUserHistory', () => {
it('returns user messages newest-first with empty/whitespace skipped', () => {
const messages = [
MSG('user', ' '),
MSG('assistant', 'hi'),
MSG('user', 'first'),
MSG('user', 'second')
]
expect(deriveUserHistory(messages, m => m.text)).toEqual(['second', 'first'])
})
})
describe('browseBackward', () => {
it('returns null when history is empty', () => {
expect(browseBackward(SESSION_A, '', [])).toBeNull()
})
it('returns the most recent entry on first press and saves the draft', () => {
const result = browseBackward(SESSION_A, 'unsent draft', HISTORY)
expect(result).toBe('third')
expect($perSessionBrowse.get()[SESSION_A]!.draftSnapshot).toBe('unsent draft')
})
it('moves to older entries on subsequent presses and stops at the oldest', () => {
expect(browseBackward(SESSION_A, '', HISTORY)).toBe('third')
expect(browseBackward(SESSION_A, '', HISTORY)).toBe('second')
expect(browseBackward(SESSION_A, '', HISTORY)).toBe('first')
expect(browseBackward(SESSION_A, '', HISTORY)).toBeNull()
})
it('uses caller-provided history, not a mirrored ring', () => {
// The store never owns the ring — the caller passes it every press.
// If the ring changes between presses (e.g. a new message was sent),
// the next press sees the updated ring and the cursor continues
// from where it was within it.
expect(browseBackward(SESSION_A, '', ['youngest', 'older'])).toBe('youngest')
// Caller added a new message; ring is now [brand-new, youngest, older].
// Cursor was at 0, next press advances to 1 -> "youngest".
expect(
browseBackward(SESSION_A, '', ['brand-new', 'youngest', 'older'])
).toBe('youngest')
// One more press -> "older".
expect(
browseBackward(SESSION_A, '', ['brand-new', 'youngest', 'older'])
).toBe('older')
})
})
describe('browseForward', () => {
it('returns null when not browsing', () => {
expect(browseForward(SESSION_A, HISTORY)).toBeNull()
})
it('moves toward the present', () => {
browseBackward(SESSION_A, 'draft', HISTORY) // cursor 0 -> 'third'
browseBackward(SESSION_A, '', HISTORY) // cursor 1 -> 'second'
expect(browseForward(SESSION_A, HISTORY)).toEqual({
text: 'third',
returnedToPresent: false
})
})
it('restores the saved draft and resets when reaching the present', () => {
browseBackward(SESSION_A, 'my original draft', HISTORY)
const result = browseForward(SESSION_A, HISTORY)
expect(result).toEqual({ text: 'my original draft', returnedToPresent: true })
expect(isBrowsingHistory(SESSION_A)).toBe(false)
})
})
describe('per-session isolation', () => {
it('tracks cursor and draft independently per session', () => {
browseBackward(SESSION_A, 'draft-a', HISTORY)
browseBackward(SESSION_A, '', HISTORY) // older
browseBackward(SESSION_B, 'draft-b', HISTORY)
const a = $perSessionBrowse.get()[SESSION_A]!
const b = $perSessionBrowse.get()[SESSION_B]!
expect(a.cursor).toBe(1)
expect(a.draftSnapshot).toBe('draft-a')
expect(b.cursor).toBe(0)
expect(b.draftSnapshot).toBe('draft-b')
})
})
describe('resetBrowseState', () => {
it('clears cursor and draft snapshot', () => {
browseBackward(SESSION_A, 'draft', HISTORY)
resetBrowseState(SESSION_A)
const s = $perSessionBrowse.get()[SESSION_A]!
expect(s.cursor).toBe(-1)
expect(s.draftSnapshot).toBe('')
})
})
describe('session switch behavior', () => {
it('resets the previous session cursor and lets the new session derive its own ring', () => {
// Session A: user browsed into the past
browseBackward(SESSION_A, '', HISTORY)
expect(isBrowsingHistory(SESSION_A)).toBe(true)
// Caller switches to session B; resets A's browse state
resetBrowseState(SESSION_A)
// Session B's ring is derived from B's messages, not A's
const sessionBMessages = [MSG('user', 'hello-b'), MSG('user', 'world-b')]
const sessionBHistory = deriveUserHistory(sessionBMessages, m => m.text)
expect(browseBackward(SESSION_B, '', sessionBHistory)).toBe('world-b')
expect(browseBackward(SESSION_B, '', sessionBHistory)).toBe('hello-b')
expect(isBrowsingHistory(SESSION_A)).toBe(false)
})
})