rushstack/libraries/node-core-library/src/test/Text.test.ts at octogonz/FunctionAndMethodAccessability · JavaScriptExpert/rushstack · GitHub

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// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
// See LICENSE in the project root for license information.

import { Text } from '../Text';

describe('Text', () => {
  describe('padEnd', () => {
    test('Throws an exception if the padding character isn\'t a single character', () => {
      expect(() => Text.padEnd('123', 1, '')).toThrow();
      expect(() => Text.padEnd('123', 1, '  ')).toThrow();
    });

    test('Doesn\'t change the string if it\'s already at or greater than the minimum length', () => {
      expect(Text.padEnd('12345', 5)).toEqual( '12345');
      expect(Text.padEnd('123456', 5)).toEqual('123456');
      expect(Text.padEnd('12345', 5, '0')).toEqual( '12345');
      expect(Text.padEnd('123456', 5, '0')).toEqual('123456');
    });

    test('Appends the default character (spaces) to the end of a string', () => {
      expect(Text.padEnd('', 5)).toEqual(   '     ');
      expect(Text.padEnd('123', 5)).toEqual('123  ');
    });

    test('Appends the characters to the end of a string', () => {
      expect(Text.padEnd('', 5, '0')).toEqual(   '00000');
      expect(Text.padEnd('123', 5, '0')).toEqual('12300');
    });
  });

  describe('padStart', () => {
    test('Throws an exception if the padding character isn\'t a single character', () => {
      expect(() => Text.padStart('123', 1, '')).toThrow();
      expect(() => Text.padStart('123', 1, '  ')).toThrow();
    });

    test('Doesn\'t change the string if it\'s already at or greater than the minimum length', () => {
      expect(Text.padStart('12345', 5)).toEqual( '12345');
      expect(Text.padStart('123456', 5)).toEqual('123456');
      expect(Text.padStart('12345', 5, '0')).toEqual( '12345');
      expect(Text.padStart('123456', 5, '0')).toEqual('123456');
    });

    test('Appends the default character (spaces) to the end of a string', () => {
      expect(Text.padStart('', 5)).toEqual(   '     ');
      expect(Text.padStart('123', 5)).toEqual('  123');
    });

    test('Appends the characters to the end of a string', () => {
      expect(Text.padStart('', 5, '0')).toEqual(   '00000');
      expect(Text.padStart('123', 5, '0')).toEqual('00123');
    });
  });

  describe('truncateWithEllipsis', () => {
    test('Throws an exception if the maximum length is less than zero', () => {
      expect(() => Text.truncateWithEllipsis('123', -1)).toThrow();
    });

    test('Doesn\'t change the string if it\'s already shorter than the maximum length', () => {
      expect(Text.truncateWithEllipsis('', 2)).toEqual(      '');
      expect(Text.truncateWithEllipsis('1', 2)).toEqual(     '1');
      expect(Text.truncateWithEllipsis('12', 2)).toEqual(    '12');

      expect(Text.truncateWithEllipsis('123', 5)).toEqual(   '123');
      expect(Text.truncateWithEllipsis('1234', 5)).toEqual(  '1234');
    });

    test('Truncates strings', () => {
      expect(Text.truncateWithEllipsis('123', 0)).toEqual(   '');
      expect(Text.truncateWithEllipsis('123', 2)).toEqual(   '12');
      expect(Text.truncateWithEllipsis('12345', 5)).toEqual( '12345');
      expect(Text.truncateWithEllipsis('123456', 5)).toEqual('12...');
    });
  });
});