(Article - You should aim to forget how your code works)

decodeMorse.test.js

describe("GIVEN a call to decodeMorse", () => {
  [... additional tests to cover non-edge cases ...]
  it('THEN it decodes the special SOS code', () => {
    Test.assertEquals(decodeMorse('...---...'), 'SOS');
  });
  
  it('THEN it decodes the special = code', () => {
    Test.assertEquals(decodeMorse('-...-'), '=');
  });
  
  describe("AND the input contains trailing spaces", () => {
    it('THEN the trailing spaces are removed and ignored in the output', () => {
      Test.assertEquals(decodeMorse(' .... . .-.. .-.. ---   -- . -.. .. ..- -- '), 'HELLO MEDIUM');
    });
  });
});