typescript_support_spec.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import {checkVersion} from '../src/typescript_support';

describe('checkVersion', () => {
  const MIN_TS_VERSION = '2.7.2';
  const MAX_TS_VERSION = '2.8.0';

  const versionError = (version: string) =>
      `The Angular Compiler requires TypeScript >=${MIN_TS_VERSION} and <${MAX_TS_VERSION} but ${version} was found instead.`;

  it('should not throw when a supported TypeScript version is used', () => {
    expect(() => checkVersion('2.7.2', MIN_TS_VERSION, MAX_TS_VERSION)).not.toThrow();
    expect(() => checkVersion('2.7.9', MIN_TS_VERSION, MAX_TS_VERSION)).not.toThrow();
  });

  it('should handle a TypeScript version < the minimum supported one', () => {
    expect(() => checkVersion('2.4.1', MIN_TS_VERSION, MAX_TS_VERSION))
        .toThrowError(versionError('2.4.1'));
    expect(() => checkVersion('2.7.1', MIN_TS_VERSION, MAX_TS_VERSION))
        .toThrowError(versionError('2.7.1'));
  });

  it('should handle a TypeScript version > the maximum supported one', () => {
    expect(() => checkVersion('2.9.0', MIN_TS_VERSION, MAX_TS_VERSION))
        .toThrowError(versionError('2.9.0'));
    expect(() => checkVersion('2.8.0', MIN_TS_VERSION, MAX_TS_VERSION))
        .toThrowError(versionError('2.8.0'));
  });
});