fix: harden Hermes stream recovery around tool boundaries (#189)

tests/client/chat-api.test.ts

@@ -0,0 +1,59 @@
+// @vitest-environment jsdom
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { streamRunEvents, type RunEvent } from '@/api/hermes/chat'
+
+class MockEventSource {
+  static instances: MockEventSource[] = []
+
+  url: string
+  onmessage: ((event: { data: string }) => void) | null = null
+  onerror: (() => void) | null = null
+  close = vi.fn()
+
+  constructor(url: string) {
+    this.url = url
+    MockEventSource.instances.push(this)
+  }
+
+  emit(data: string) {
+    this.onmessage?.({ data })
+  }
+
+  fail() {
+    this.onerror?.()
+  }
+}
+
+describe('streamRunEvents', () => {
+  beforeEach(() => {
+    window.localStorage.clear()
+    MockEventSource.instances = []
+    vi.stubGlobal('EventSource', MockEventSource)
+  })
+
+  it('maps non-JSON EventSource data to message.delta so raw text is rendered', () => {
+    const events: RunEvent[] = []
+
+    streamRunEvents('run-raw', event => events.push(event), vi.fn(), vi.fn())
+    MockEventSource.instances[0].emit('原因：raw fallback')
+
+    expect(events).toEqual([{ event: 'message.delta', delta: '原因：raw fallback' }])
+  })
+
+  it('parses colon-containing JSON deltas and closes on completion', () => {
+    const events: RunEvent[] = []
+    const onDone = vi.fn()
+
+    streamRunEvents('run-json', event => events.push(event), onDone, vi.fn())
+    const source = MockEventSource.instances[0]
+    source.emit(JSON.stringify({ event: 'message.delta', delta: '让我直接读文件：A: B' }))
+    source.emit(JSON.stringify({ event: 'run.completed' }))
+
+    expect(events).toEqual([
+      { event: 'message.delta', delta: '让我直接读文件：A: B' },
+      { event: 'run.completed' },
+    ])
+    expect(source.close).toHaveBeenCalledTimes(1)
+    expect(onDone).toHaveBeenCalledTimes(1)
+  })
+})