file-utils.spec.ts

import { calculateFileChanges, WholeFileChange } from './file-utils';
import { DiffType, JsonChange, jsonDiff } from '../utils/json-diff';

const ignore = require('ignore');

describe('calculateFileChanges', () => {
  it('should return a whole file change by default', () => {
    const changes = calculateFileChanges(
      ['proj/index.ts'],
      undefined,
      (path, revision) => {
        return revision === 'sha1' ? '' : 'const a = 0;';
      }
    );

    expect(changes[0].getChanges()).toEqual([new WholeFileChange()]);
  });

  it('should return a json changes for json files', () => {
    const changes = calculateFileChanges(
      ['package.json'],
      {
        base: 'sha1',
        head: 'sha2'
      },
      (path, revision) => {
        return revision === 'sha1'
          ? JSON.stringify({
              dependencies: {
                'happy-nrwl': '0.0.1',
                'not-awesome-nrwl': '0.0.1'
              }
            })
          : JSON.stringify({
              dependencies: {
                'happy-nrwl': '0.0.2',
                'awesome-nrwl': '0.0.1'
              }
            });
      }
    );

    expect(changes[0].getChanges()).toContainEqual({
      type: DiffType.Modified,
      path: ['dependencies', 'happy-nrwl'],
      value: {
        lhs: '0.0.1',
        rhs: '0.0.2'
      }
    });
    expect(changes[0].getChanges()).toContainEqual({
      type: DiffType.Deleted,
      path: ['dependencies', 'not-awesome-nrwl'],
      value: {
        lhs: '0.0.1',
        rhs: undefined
      }
    });
    expect(changes[0].getChanges()).toContainEqual({
      type: DiffType.Added,
      path: ['dependencies', 'awesome-nrwl'],
      value: {
        lhs: undefined,
        rhs: '0.0.1'
      }
    });
  });

  it('should ignore *.md changes', () => {
    const ig = ignore();
    ig.add('*.md');
    const changes = calculateFileChanges(
      ['proj/readme.md'],
      undefined,
      (path, revision) => {
        return revision === 'sha1' ? '' : 'const a = 0;';
      },
      ig
    );
    expect(changes.length).toEqual(0);
  });
});