import { NotImplementedHttpError } from '../../../../src/util/errors/NotImplementedHttpError';
import { EjsTemplateEngine } from '../../../../src/util/templates/EjsTemplateEngine';

jest.mock('../../../../src/util/templates/TemplateUtil', (): any => ({
  getTemplateFilePath: jest.fn((template): string => template),
  readTemplate: jest.fn(async(): Promise<string> => `<%= detail %>`),
}));

describe('A EjsTemplateEngine', (): void => {
  const contents = { detail: 'a&b' };
  let templateEngine: EjsTemplateEngine;

  beforeEach((): void => {
    templateEngine = new EjsTemplateEngine('http://localhost:3000');
  });

  it('uses the passed template.', async(): Promise<void> => {
    await expect(templateEngine.handleSafe({ contents, template: 'someTemplate.ejs' }))
      .resolves.toBe('a&amp;b');
  });

  it('throws an exception for unsupported template files.', async(): Promise<void> => {
    await expect(templateEngine.handleSafe({ contents, template: 'someTemplate.txt' }))
      .rejects.toThrow(NotImplementedHttpError);
  });

  it('throws an exception if no template was passed.', async(): Promise<void> => {
    await expect(templateEngine.handleSafe({ contents }))
      .rejects.toThrow(NotImplementedHttpError);
  });
});