Assert methods for testing purposes

assert.ts

export const assert = (expectation: any, result: any, test: string = '') => {
  if (typeof expectation !== typeof result) {
    test += ` TYPE DIFFERENCE ${typeof expectation} compared to ${typeof result}`;
    return output(expectation, result, test, false);
  }
  if (typeof expectation === 'object') {
    return assertObj(expectation, result, test);
  } else if (Array.isArray(expectation)) {
    return assertArray(expectation, result, test);
  } else {
    const isSame = expectation === result ? true : false;
    return output(expectation, result, test, isSame);
  }
};

function assertArray(expectation: any, result: any, test: string = '') {
  if (expectation.length !== result.length) {
    return output(expectation, result, test, false);
  }
  let isSame = true;
  for (let i = 0; i < expectation.length; i++) {
    if (expectation[i] !== result[i]) {
      isSame = false;
      break;
    }
  }
  return output(expectation, result, test, isSame);
}

function assertObj(expectation: any, result: any, test: string = '') {
  let isSame = true;
  const keys1 = Object.keys(result);
  const keys2 = Object.keys(expectation);
  if (keys1.length !== keys2.length) {
    isSame = false;
  }
  for (const prop in result) {
    if (expectation[prop] !== result[prop]) {
      isSame = false;
    }
  }

  return output(expectation, result, test, isSame);
}

function output(expectation: any, result: any, test: string, isSame: boolean) {
  if (isSame) {
    return `::TEST ${test.toUpperCase()} PASSED::`;
  } else {
    if (typeof expectation === 'object') {
      return `::TEST ${test.toUpperCase()} FAILED:: EXPECTED ${JSON.stringify(expectation)} but got ${JSON.stringify(result)}`;
    } else {
      return `::TEST ${test.toUpperCase()} FAILED:: EXPECTED ${expectation} but got ${result}`;
    }
  }
}

export default assert;

// assert('123'.length, 3, '3 chars'); //?
// assert('1234'.length, 3, '3 chars'); //?