This test has incorrect expectations. When text is "Some text" (9 characters) and maxLength is 150, the early return on line 46 of titleSummarizer.ts will execute, returning { success: true, summarizedTitle: text } without ever validating the API configuration.

The test expects success: false and an error about missing API configuration, but this validation never occurs due to the short text length.

To properly test missing API configuration handling, use text longer than maxLength to bypass the early return:

const longText = "a".repeat(151) // Exceeds maxLength of 150
const result = await TitleSummarizer.summarizeTitle({
  text: longText,
  apiConfiguration: undefined as any,
  maxLength: 150,
})

expect(result.success).toBe(false)
expect(result.error).toBe("No valid API configuration provided")

Note: The error message should also be "No valid API configuration provided" (from singleCompletionHandler.ts:14) not "No API configuration available".

This test doesn't actually verify custom support prompts functionality. The text "Text to summarize" (18 characters) is shorter than maxLength (150), triggering the early return on line 46 that bypasses prompt creation entirely.

To properly test custom support prompts:

const customPrompts = {
  SUMMARIZE_TITLE: "Custom summarization prompt: {{userInput}} (max 150 chars)",
}
const longText = "a".repeat(151)

const result = await TitleSummarizer.summarizeTitle({
  text: longText,
  apiConfiguration: mockApiConfiguration,
  customSupportPrompts: customPrompts,
  maxLength: 150,
})

// Verify the custom prompt was actually used
expect(singleCompletionHandler).toHaveBeenCalledWith(
  mockApiConfiguration,
  expect.stringContaining("Custom summarization prompt")
)

Unused import: ClineMessage is imported but never used in this file. Please remove it to keep imports clean.

Unused imports: Both TelemetryEventName and ClineProvider are imported but never used in this file. The ClineProvider import (line 6) is particularly unnecessary since there's no reference to it anywhere.

Please remove both unused imports:

import { ProviderSettings } from "@roo-code/types"
import { TelemetryService } from "@roo-code/telemetry"
import { supportPrompt } from "../../shared/support-prompt"
import { singleCompletionHandler } from "../../utils/single-completion-handler"
import { ProviderSettingsManager } from "../config/ProviderSettingsManager"