@ingeze/api-error/dist/test/handlers/nest.test.js

A TypeScript library for handling HTTP errors in Express, NestJS, and Fastify APIs.

import { NestErrorFilter, NestGenericErrorFilter } from "src/handlers/nest";
import { ErrorHandler } from "src/errors/error-handler";
import { HttpException } from "@nestjs/common";
describe("NestErrorFilter", () => {
  let filter;
  let mockResponse;
  let mockHost;
  beforeEach(() => {
    filter = new NestErrorFilter();
    mockResponse = {
      status: jest.fn().mockReturnThis(),
      json: jest.fn()
    };
    mockHost = {
      switchToHttp: () => ({
        getResponse: () => mockResponse
      })
    };
  });
  it("should handle ErrorHandler and respond with its status and JSON", () => {
    const error = new ErrorHandler("Custom error", 418);
    jest.spyOn(error, "toJSON").mockReturnValue({
      success: false,
      type: "CUSTOM_ERROR",
      statusCode: 418,
      message: "Custom error"
    });
    filter.catch(error, mockHost);
    expect(mockResponse.status).toHaveBeenCalledWith(418);
    expect(mockResponse.json).toHaveBeenCalledWith({
      success: false,
      type: "CUSTOM_ERROR",
      statusCode: 418,
      message: "Custom error"
    });
  });
});
describe("NestGenericErrorFilter", () => {
  let filter;
  let mockResponse;
  let mockHost;
  beforeEach(() => {
    filter = new NestGenericErrorFilter();
    mockResponse = {
      status: jest.fn().mockReturnThis(),
      json: jest.fn()
    };
    mockHost = {
      switchToHttp: () => ({
        getResponse: () => mockResponse
      })
    };
  });
  it("should handle HttpException and respond with its status and message", () => {
    class CustomHttpException extends HttpException {
      constructor() {
        super("Http error occurred", 400);
      }
    }
    const exception = new CustomHttpException();
    filter.catch(exception, mockHost);
    expect(mockResponse.status).toHaveBeenCalledWith(400);
    expect(mockResponse.json).toHaveBeenCalledWith({
      success: false,
      type: "HTTP_EXCEPTION",
      statusCode: 400,
      message: "Http error occurred"
    });
  });
  it("should handle generic Error and respond with 500", () => {
    const exception = new Error("Some error");
    filter.catch(exception, mockHost);
    expect(mockResponse.status).toHaveBeenCalledWith(500);
    expect(mockResponse.json).toHaveBeenCalledWith({
      success: false,
      type: "INTERNAL_SERVER_ERROR",
      statusCode: 500,
      message: "An unexpected error occurred"
    });
  });
});
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