test uploader

[Hao Wu]

import { TestBed, inject } from '@angular/core/testing';
import {
  HttpClientTestingModule,
  HttpTestingController,
} from '@angular/common/http/testing';
import { FileUploadService } from './file-upload.service';

describe('FileUploadService', () => {
  let service: FileUploadService;
  let httpMock: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [FileUploadService],
    });

    service = TestBed.inject(FileUploadService);
    httpMock = TestBed.inject(HttpTestingController);
  });

  afterEach(() => {
    httpMock.verify();
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

  it('should upload a file', () => {
    const fileInputId = 'fileInput';
    const uploadUrl = 'your-upload-url';
    const mockFile = new File(['file content'], 'test-file.txt', {
      type: 'text/plain',
    });

    const resultData = { success: true };

    service.uploadFile(fileInputId, uploadUrl).subscribe((data) => {
      expect(data).toEqual(resultData);
    });

    const req = httpMock.expectOne(uploadUrl);

    // Assert that the request is a POST request with the correct headers
    expect(req.request.method).toBe('POST');
    expect(req.request.headers.get('Content-Type')).toBe(
      'application/octet-stream'
    );

    // Respond to the request with mock data
    req.flush(resultData);
  });

  it('should handle an error when no file is selected', () => {
    const fileInputId = 'fileInput';
    const uploadUrl = 'your-upload-url';

    service.uploadFile(fileInputId, uploadUrl).subscribe(
      () => {},
      (error) => {
        expect(error.message).toEqual('No file selected');
      }
    );

    // No HTTP request should be made in this case
    httpMock.expectNone(uploadUrl);
  });
});

[Hao Wu]

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { FileUploadComponent } from './file-upload.component';
import { FileUploadService } from './file-upload.service';
import { of } from 'rxjs';

describe('FileUploadComponent', () => {
  let component: FileUploadComponent;
  let fixture: ComponentFixture<FileUploadComponent>;
  let fileUploadService: jasmine.SpyObj<FileUploadService>;

  beforeEach(() => {
    const fileUploadServiceSpy = jasmine.createSpyObj('FileUploadService', ['uploadFile']);

    TestBed.configureTestingModule({
      declarations: [FileUploadComponent],
      providers: [
        { provide: FileUploadService, useValue: fileUploadServiceSpy }
      ]
    });

    fixture = TestBed.createComponent(FileUploadComponent);
    component = fixture.componentInstance;
    fileUploadService = TestBed.inject(FileUploadService) as jasmine.SpyObj<FileUploadService>;
  });

  it('should create the component', () => {
    expect(component).toBeTruthy();
  });

  it('should set the selectedFile when onFileChange is called', () => {
    const mockFile = new File(['file content'], 'filename.txt');
    const event = { target: { files: [mockFile] } };

    component.onFileChange(event);

    expect(component.selectedFile).toEqual(mockFile);
  });

  it('should call uploadFileService.uploadFile when uploadFile is called with a selected file', () => {
    const mockFile = new File(['file content'], 'filename.txt');
    component.selectedFile = mockFile;

    fileUploadService.uploadFile.and.returnValue(of('mock response'));

    component.uploadFile();

    expect(fileUploadService.uploadFile).toHaveBeenCalledWith(mockFile);
  });

  it('should not call uploadFileService.uploadFile when uploadFile is called without a selected file', () => {
    component.uploadFile();

    expect(fileUploadService.uploadFile).not.toHaveBeenCalled();
  });

  // Add more test cases as needed
});

[Hao Wu]

import { Observable, fromEvent } from 'rxjs';
import { switchMap } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';

function uploadFile(file: File, uploadUrl: string, httpClient: HttpClient): Observable<any> {
  const fileInput = file

  return  new Observable({
        const reader = new FileReader();

        return new Observable((observer) => {
          // Use FileReader.onloadend to handle the load event and read the file content
          reader.onloadend = () => {
            const fileContent = reader.result as ArrayBuffer;

            const formData = new FormData();
            formData.append('file', new Blob([fileContent], { type: 'application/octet-stream' }));

            httpClient.post(uploadUrl, formData).subscribe(
              (data) => {
                observer.next(data);
                observer.complete();
              },
              (error) => observer.error(error)
            );
          };

          // Start reading the file as an ArrayBuffer
          reader.readAsArrayBuffer(file);
        });
      } else {
        // If no file is selected, emit an error
        return new Observable((observer) => {
          observer.error('No file selected');
        });
      }
    })
  );
}