alks/src/lib/trim.test.ts

CLI for working with ALKS

import { trim } from './trim';

describe('trim', () => {
  interface TestCase {
    description: string;
    input: string;
    result: ReturnType<typeof trim>;
  }

  const testCases: TestCase[] = [
    {
      description: 'when the input has no padding',
      input: 'hello',
      result: 'hello',
    },
    {
      description: 'when the input is left-padded',
      input: '  bob',
      result: 'bob',
    },
    {
      description: 'when the input is right-padded',
      input: 'market  ',
      result: 'market',
    },
    {
      description: 'when the input is padded on both sides',
      input: '    frisbee  ',
      result: 'frisbee',
    },
    {
      description: 'when the padding contains spaces, tabs, and newlines',
      input: '\n\r \t  what\t \r\t\n',
      result: 'what',
    },
  ];

  for (const t of testCases) {
    describe(t.description, () => {
      let result: ReturnType<typeof trim>;

      beforeEach(() => {
        result = trim(t.input);
      });

      it('returns the correct result', () => {
        expect(result).toEqual(t.result);
      });
    });
  }
});