feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/arch/fetch-stream/__tests__/utils.test.ts

@@ -0,0 +1,227 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+import {
+  onStart,
+  validateChunk,
+  isFetchStreamErrorInfo,
+  getStreamingErrorInfo,
+  getFetchErrorInfo,
+  isAbortError,
+} from '../src/utils';
+import { FetchStreamErrorCode } from '../src/type';
+
+describe('utils', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('onStart', () => {
+    it('应该调用 inputOnStart 函数', async () => {
+      const inputOnStart = vi.fn().mockResolvedValue(undefined);
+      const mockResponse = {
+        ok: true,
+        body: new ReadableStream(),
+        status: 200,
+      } as Response;
+
+      await onStart(mockResponse, inputOnStart);
+
+      expect(inputOnStart).toHaveBeenCalledWith(mockResponse);
+    });
+
+    it('当 response.ok 为 false 时应该抛出错误', async () => {
+      const mockResponse = {
+        ok: false,
+        body: new ReadableStream(),
+        status: 500,
+      } as Response;
+
+      await expect(onStart(mockResponse, undefined)).rejects.toThrow(
+        'Invalid Response, ResponseStatus: 500',
+      );
+    });
+
+    it('当 response.body 为 null 时应该抛出错误', async () => {
+      const mockResponse = {
+        ok: true,
+        body: null,
+        status: 200,
+      } as Response;
+
+      await expect(onStart(mockResponse, undefined)).rejects.toThrow(
+        'Invalid Response, ResponseStatus: 200',
+      );
+    });
+
+    it('当 inputOnStart 抛出错误时应该传播错误', async () => {
+      const inputOnStart = vi.fn().mockRejectedValue(new Error('Custom error'));
+      const mockResponse = {
+        ok: true,
+        body: new ReadableStream(),
+        status: 200,
+      } as Response;
+
+      await expect(onStart(mockResponse, inputOnStart)).rejects.toThrow(
+        'Custom error',
+      );
+    });
+  });
+
+  describe('validateChunk', () => {
+    it('应该成功验证正常的文本块', () => {
+      expect(() => validateChunk('normal text')).not.toThrow();
+    });
+
+    it('应该成功验证包含 code: 0 的 JSON', () => {
+      const chunk = JSON.stringify({ code: 0, msg: 'success' });
+      expect(() => validateChunk(chunk)).not.toThrow();
+    });
+
+    it('应该抛出包含非零 code 的 JSON 对象', () => {
+      const errorObj = { code: 400, msg: 'Bad Request' };
+      const chunk = JSON.stringify(errorObj);
+
+      expect(() => validateChunk(chunk)).toThrow();
+    });
+
+    it('应该成功处理无效的 JSON', () => {
+      expect(() => validateChunk('invalid json {')).not.toThrow();
+    });
+
+    it('应该成功处理非对象的 JSON', () => {
+      expect(() => validateChunk('"string"')).not.toThrow();
+      expect(() => validateChunk('123')).not.toThrow();
+      expect(() => validateChunk('true')).not.toThrow();
+    });
+
+    it('应该成功处理没有 code 字段的对象', () => {
+      const chunk = JSON.stringify({ msg: 'no code field' });
+      expect(() => validateChunk(chunk)).not.toThrow();
+    });
+  });
+
+  describe('isFetchStreamErrorInfo', () => {
+    it('应该识别有效的 FetchStreamErrorInfo', () => {
+      const errorInfo = { code: 400, msg: 'Error message' };
+      expect(isFetchStreamErrorInfo(errorInfo)).toBe(true);
+    });
+
+    it('应该拒绝缺少 code 字段的对象', () => {
+      const obj = { msg: 'Error message' };
+      expect(isFetchStreamErrorInfo(obj)).toBe(false);
+    });
+
+    it('应该拒绝缺少 msg 字段的对象', () => {
+      const obj = { code: 400 };
+      expect(isFetchStreamErrorInfo(obj)).toBe(false);
+    });
+
+    it('应该拒绝非对象值', () => {
+      expect(isFetchStreamErrorInfo(null)).toBe(false);
+      expect(isFetchStreamErrorInfo(undefined)).toBe(false);
+      expect(isFetchStreamErrorInfo('string')).toBe(false);
+      expect(isFetchStreamErrorInfo(123)).toBe(false);
+    });
+  });
+
+  describe('getStreamingErrorInfo', () => {
+    it('应该从 Error 对象中提取消息', () => {
+      const error = new Error('Test error message');
+      const result = getStreamingErrorInfo(error);
+
+      expect(result).toEqual({
+        msg: 'Test error message',
+        code: FetchStreamErrorCode.HttpChunkStreamingException,
+        error,
+      });
+    });
+
+    it('应该从 FetchStreamErrorInfo 对象中提取信息', () => {
+      const errorInfo = { code: 400, msg: 'Custom error' };
+      const result = getStreamingErrorInfo(errorInfo);
+
+      expect(result).toEqual({
+        msg: 'Custom error',
+        code: 400,
+        error: errorInfo,
+      });
+    });
+
+    it('应该处理未知错误类型', () => {
+      const error = 'string error';
+      const result = getStreamingErrorInfo(error);
+
+      expect(result).toEqual({
+        msg: 'An exception occurred during the process of dealing with HTTP chunked streaming response.',
+        code: FetchStreamErrorCode.HttpChunkStreamingException,
+        error,
+      });
+    });
+  });
+
+  describe('getFetchErrorInfo', () => {
+    it('应该从 Error 对象中提取消息', () => {
+      const error = new Error('Fetch failed');
+      const result = getFetchErrorInfo(error);
+
+      expect(result).toEqual({
+        msg: 'Fetch failed',
+        code: FetchStreamErrorCode.FetchException,
+        error,
+      });
+    });
+
+    it('应该处理非 Error 对象', () => {
+      const error = 'fetch error';
+      const result = getFetchErrorInfo(error);
+
+      expect(result).toEqual({
+        msg: 'An exception occurred during the fetch',
+        code: FetchStreamErrorCode.FetchException,
+        error,
+      });
+    });
+  });
+
+  describe('isAbortError', () => {
+    it('应该识别 AbortError', () => {
+      const abortError = new DOMException(
+        'The operation was aborted',
+        'AbortError',
+      );
+      expect(isAbortError(abortError)).toBe(true);
+    });
+
+    it('应该拒绝其他 DOMException', () => {
+      const otherError = new DOMException('Other error', 'OtherError');
+      expect(isAbortError(otherError)).toBe(false);
+    });
+
+    it('应该拒绝普通 Error', () => {
+      const error = new Error('Normal error');
+      expect(isAbortError(error)).toBe(false);
+    });
+
+    it('应该拒绝非错误对象', () => {
+      expect(isAbortError('string')).toBe(false);
+      expect(isAbortError(null)).toBe(false);
+      expect(isAbortError(undefined)).toBe(false);
+    });
+  });
+});