🧪 [testing improvement] Add tests for truncateToolResponse

packages/web/src/lib/server/events.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { deriveFields } from './events'
+import { deriveFields, truncateToolResponse } from './events'
 
 describe('deriveFields', () => {
   it('marks normalized slash commands as skill calls', () => {
@@ -67,3 +67,31 @@ describe('deriveFields', () => {
     })
   })
 })
+
+
+describe('truncateToolResponse', () => {
+  it('returns undefined if response is undefined', () => {
+    expect(truncateToolResponse(undefined)).toBeUndefined()
+  })
+
+  it('returns undefined if response is empty string', () => {
+    expect(truncateToolResponse('')).toBeUndefined()
+  })
+
+  it('returns the same string if length is less than 2000', () => {
+    const shortString = 'Hello, world!'
+    expect(truncateToolResponse(shortString)).toBe(shortString)
+  })
+
+  it('returns the same string if length is exactly 2000', () => {
+    const exactString = 'a'.repeat(2000)
+    expect(truncateToolResponse(exactString)).toBe(exactString)
+  })
+
+  it('truncates the string to 2000 characters if length is greater than 2000', () => {
+    const longString = 'a'.repeat(2500)
+    const truncated = truncateToolResponse(longString)
+    expect(truncated).toBe('a'.repeat(2000))
+    expect(truncated?.length).toBe(2000)
+  })
+})

pr_description.txt

@@ -0,0 +1,12 @@
+🎯 **What:** The testing gap addressed
+Added tests for the `truncateToolResponse` function in `packages/web/src/lib/server/events.ts`.
+
+📊 **Coverage:** What scenarios are now tested
+- `undefined` input.
+- Empty string input.
+- Strings shorter than the 2000 character limit.
+- Strings exactly 2000 characters long.
+- Strings longer than the 2000 character limit, confirming they are correctly truncated.
+
+✨ **Result:** The improvement in test coverage
+The `truncateToolResponse` function is now fully tested, ensuring that responses are appropriately truncated without causing errors across various edge cases and standard input sizes.