runWithDebugger.html

<script src="simpletest.js"></script>
<script>

  /*
  The runWithDebugger function should run a callback with a debugger

  Syntax:
    Formula: runWithDebugger(callback, [callbackArguments])

    Arguments:
      callback
      [callbackArguments]

    Return Value: undefined

  Tests:
    callback:
      It should take a callback function as the first argument [DONE]
      It should run the callback function [DONE]
    callbackArguments:
      It should take an array as the optional second argument [DONE]
      It should input the array elements as the callback arguments
  */

  function runWithDebugger(callback, callbackArguments) {
    debugger;

    if (toString.call(callback) !== '[object Function]') {
      throw new TypeError('I am not a function');
    }

    if (callbackArguments) {
      if (!Array.isArray(callbackArguments)) {
        throw new TypeError('I am not an array')
      }
      return callback(...callbackArguments);
    }
    return callback();
  }

  tests({
    'It should take a callback function as the first argument': function () {
      var isTypeError = false;
      try {
        runWithDebugger('I am not a function');
      }
      catch (e) {
        isTypeError = e instanceof TypeError;
      }
      eq(isTypeError, true);
    },

    'It should run the callback function': function() {
      var callbackRan = 0;
      runWithDebugger(function() {
        callbackRan++;
      })
      eq(callbackRan, 1);
    },

    'It should take an array as the optional second argument': function() {
      var isTypeError = false;
      try {
        runWithDebugger(function(){},'I am not an array');
      }
      catch (e) {
        isTypeError = e instanceof TypeError;
      }
      eq(isTypeError, true);
    },

    'It should input the array elements as the callback arguments': function() {
      debugger;
      var result = runWithDebugger(function addNumbers(numOne, numTwo, numThree) {
        return numOne + numTwo + numThree
      }, [1,2,3])

      eq(result, 6);
    }

  });
</script>