@variantjs/core/src/__tests__/promisifyFunctionResult.test.ts

VariantJS common functions and utilities

import promisifyFunctionResult from '../helpers/promisifyFunctionResult';

describe('promisifyFunctionResult', () => {
  it('converts the result of a function into a promise', async () => {
    const fn = () => 'result';

    const promisified = promisifyFunctionResult(fn);

    expect(promisified).toBeInstanceOf(Promise);

    const result = await promisified;

    expect(result).toBe('result');
  });

  it('keeps promises as it is', async () => {
    const fn = () => new Promise((resolve) => resolve('result'));

    const promisified = promisifyFunctionResult(fn);

    expect(promisified).toBeInstanceOf(Promise);

    const result = await promisified;

    expect(result).toBe('result');
  });

  it('pass the parameters to the function', async () => {
    const fn = (status: string): string => {
      if (status === 'success') {
        return 'success';
      }

      return 'error';
    };

    const promisified = promisifyFunctionResult(fn, 'success');

    expect(promisified).toBeInstanceOf(Promise);

    const result = await promisified;

    expect(result).toBe('success');

    const promisified2 = promisifyFunctionResult(fn, 'other');

    expect(promisified2).toBeInstanceOf(Promise);

    const result2 = await promisified2;

    expect(result2).toBe('error');
  });

  it('pass the parameters to the promise', async () => {
    const fn = (status: string): Promise<string> => new Promise((resolve) => {
      if (status === 'success') {
        resolve('success');
      }

      resolve('error');
    });

    const promisified = promisifyFunctionResult(fn, 'success');

    expect(promisified).toBeInstanceOf(Promise);

    const result = await promisified;

    expect(result).toBe('success');

    const promisified2 = promisifyFunctionResult(fn, 'other');

    expect(promisified2).toBeInstanceOf(Promise);

    const result2 = await promisified2;

    expect(result2).toBe('error');
  });
});