gulp-function/test/test.node.ts

import { finished } from 'node:stream/promises';

import { expect, tap } from '@git.zone/tstest/tapbundle';
import gulp from 'gulp';
import * as gulpFunction from '../ts/index.js';

interface ITestVinylFile {
  relative: string;
}

tap.test('should run through smoothly with forEach', async () => {
  const processedFiles: string[] = [];
  const stream = gulp.src('./test/testfiles/*.md').pipe(
    gulpFunction.forEach<ITestVinylFile>(async (fileArg) => {
      if (fileArg) {
        processedFiles.push(fileArg.relative);
      }
    })
  );

  stream.resume();
  await finished(stream);
  expect(processedFiles).toHaveLength(18);
});

tap.test('should run only once with forFirst', async () => {
  const processedFiles: string[] = [];
  const stream = gulp.src('./test/testfiles/*.md').pipe(
    gulpFunction.forFirst<ITestVinylFile>(async (fileArg) => {
      if (fileArg) {
        processedFiles.push(fileArg.relative);
      }
    })
  );

  stream.resume();
  await finished(stream);
  expect(processedFiles).toHaveLength(1);
});

tap.test('should run once after all files with atEnd', async () => {
  let atEndCounter = 0;
  let passthroughCounter = 0;
  const stream = gulp.src('./test/testfiles/*.md').pipe(
    gulpFunction.atEnd(async () => {
      atEndCounter++;
    })
  );

  stream.on('data', () => {
    passthroughCounter++;
  });
  await finished(stream);
  expect(atEndCounter).toEqual(1);
  expect(passthroughCounter).toEqual(18);
});

export default tap.start();