angular/aio/content/examples/cli-builder/src/my-builder.spec.ts

// #docregion
import { Architect } from '@angular-devkit/architect';
import { TestingArchitectHost } from '@angular-devkit/architect/testing';
import { schema } from '@angular-devkit/core';
import { promises as fs } from 'fs';
import { join } from 'path';

describe('Copy File Builder', () => {
  let architect: Architect;
  let architectHost: TestingArchitectHost;

  beforeEach(async () => {
    const registry = new schema.CoreSchemaRegistry();
    registry.addPostTransform(schema.transforms.addUndefinedDefaults);

    // TestingArchitectHost() takes workspace and current directories.
    // Since we don't use those, both are the same in this case.
    architectHost = new TestingArchitectHost(__dirname, __dirname);
    architect = new Architect(architectHost, registry);

    // This will either take a Node package name, or a path to the directory
    // for the package.json file.
    await architectHost.addBuilderFromPackage(join(__dirname, '..'));
  });

  it('can copy files', async () => {
    // A "run" can have multiple outputs, and contains progress information.
    const run = await architect.scheduleBuilder('@example/copy-file:copy', {
      source: 'package.json',
      destination: 'package-copy.json',
    });

    // The "result" member (of type BuilderOutput) is the next output.
    const output = await run.result;

    // Stop the builder from running. This stops Architect from keeping
    // the builder-associated states in memory, since builders keep waiting
    // to be scheduled.
    await run.stop();

    // Expect that the copied file is the same as its source.
    const sourceContent = await fs.readFile('package.json', 'utf8');
    const destinationContent = await fs.readFile('package-copy.json', 'utf8');
    expect(destinationContent).toBe(sourceContent);
  });
});
// #enddocregion