renovate/test/util.ts

import crypto from 'crypto';
import { expect, jest } from '@jest/globals';
import { RenovateConfig as _RenovateConfig } from '../lib/config';
import { getConfig } from '../lib/config/defaults';
import { platform as _platform } from '../lib/platform';
import * as _env from '../lib/util/exec/env';
import * as _gitfs from '../lib/util/gitfs';
import * as _hostRules from '../lib/util/host-rules';

/**
 * Simple wrapper for getting mocked version of a module
 * @param module module which is mocked by `jest.mock`
 */
export function mocked<T>(module: T): jest.Mocked<T> {
  return module as never;
}

/**
 * Simply wrapper to create partial mocks.
 * @param obj Object to cast to final type
 */
export function partial<T>(obj: Partial<T>): T {
  return obj as T;
}

export const gitfs = mocked(_gitfs);
export const platform = mocked(_platform);
export const env = mocked(_env);
export const hostRules = mocked(_hostRules);

// Required because of isolatedModules
export type RenovateConfig = _RenovateConfig;

export const defaultConfig = getConfig();

export { getConfig };

export function getName(file: string): string {
  const [, name] = /lib\/(.*?)\.spec\.ts$/.exec(file.replace(/\\/g, '/'));
  return name;
}

/**
 * Can be used to search and replace strings in jest snapshots.
 * @example
 * expect.addSnapshotSerializer(
 *     replacingSerializer(upath.toUnix(gradleDir.path), 'localDir')
 * );
 */
export const replacingSerializer = (
  search: string,
  replacement: string
): jest.SnapshotSerializerPlugin => ({
  test: (value) => typeof value === 'string' && value.includes(search),
  serialize: (val, config, indent, depth, refs, printer) => {
    const replaced = (val as string).replace(search, replacement);
    return printer(replaced, config, indent, depth, refs);
  },
});

export function addReplacingSerializer(from: string, to: string): void {
  expect.addSnapshotSerializer(replacingSerializer(from, to));
}

function toHash(buf: Buffer): string {
  return crypto.createHash('sha256').update(buf).digest('hex');
}

const bufferSerializer: jest.SnapshotSerializerPlugin = {
  test: (value) => Buffer.isBuffer(value),
  serialize: (val, config, indent, depth, refs, printer) => {
    const replaced = toHash(val);
    return printer(replaced, config, indent, depth, refs);
  },
};

export function addBufferSerializer(): void {
  expect.addSnapshotSerializer(bufferSerializer);
}