thedesk/app/node_modules/over/test/overloadTest.js

'use strict';

var overload = require('../');

module.exports = {
  'no parameters, valid args': function (test) {
    var called = 0;
    var fn = overload([
      [function () { called++; return 42; }]
    ]);
    var ret = fn();
    test.equals(called, 1);
    test.equals(ret, 42);
    test.done();
  },

  'no parameters, invalid args': function (test) {
    var called = 0;
    var fn = overload([
      [function () { called++; }]
    ]);
    try {
      fn(1);
      test.fail('should throw exception');
    } catch (ex) {

    }
    test.done();
  },

  'default callback': function (test) {
    var called = 0;
    var args = null;
    var fn = overload([
      [overload.func, function (fn) { test.fail('should not be called.'); }],
      function () {
        called++;
        args = Array.prototype.slice.call(arguments);
      }
    ]);
    fn('test');
    test.equals(called, 1, 'overload not called');
    test.deepEqual(args, ['test']);
    test.done();
  },

  'one parameter, valid args': function (test) {
    var called = 0;
    var argFnCalled = 0;
    var fn = overload([
      [overload.func, function (fn) {
        called++;
        fn();
      }]
    ]);
    fn(function () { argFnCalled++; });
    test.equals(called, 1, 'overload not called');
    test.equals(argFnCalled, 1, 'arg function not called');
    test.done();
  },

  'one parameter, invalid args': function (test) {
    var called = 0;
    var fn = overload([
      [overload.func, function () { called++; }]
    ]);
    try {
      fn(1);
      test.fail('should throw exception');
    } catch (ex) {

    }
    test.done();
  },

  'optional parameter, valid args': function (test) {
    var called = 0;
    var argFnCalled = 0;
    var fn = overload([
      [overload.funcOptional, function (fn) {
        called++;
        fn();
      }]
    ]);
    fn(function () { argFnCalled++; });
    test.equals(called, 1, 'overload not called');
    test.equals(argFnCalled, 1, 'arg function not called');
    test.done();
  },

  'optional parameter, no args': function (test) {
    var called = 0;
    var fn = overload([
      [overload.funcOptional, function (fn) {
        called++;
        if (fn) {
          test.fail('no function should be passed');
        }
      }]
    ]);
    fn();
    test.equals(called, 1, 'overload not called');
    test.done();
  },

  'optional parameter, invalid args': function (test) {
    var called = 0;
    var fn = overload([
      [overload.funcOptional, function () { called++; }]
    ]);
    try {
      fn(1);
      test.fail('should throw exception');
    } catch (ex) {

    }
    test.done();
  },

  'multiple overloads, valid args': function (test) {
    var called = 0;
    var val = null;
    var fn = overload([
      [overload.number, function (n) { test.fail('this function should not be called'); }],
      [overload.string, function (s) {
        val = s;
        called++;
      }]
    ]);
    fn('test');
    test.equals(called, 1, 'overload not called');
    test.equals(val, 'test', 'overload called with wrong value');
    test.done();
  },

  'multiple overloads, invalid args': function (test) {
    var called = 0;
    var fn = overload([
      [overload.number, function (n) { test.fail('this function should not be called'); }],
      [overload.string, function (s) { called++; }]
    ]);
    try {
      fn(function () {});
      test.fail('should throw exception');
    } catch (ex) {

    }
    test.done();
  },

  'optional parameter, with default value': function (test) {
    var called = 0;
    var val = null;
    var fn = overload([
      [overload.numberOptionalWithDefault(5), overload.func, function (n) {
        called++;
        val = n;
      }]
    ]);
    fn(function() {});
    test.equals(called, 1, 'overload not called');
    test.equals(val, 5);
    test.done();
  },

  'number optional parameter, called with non-zero number': function (test) {
    var called = 0;
    var val = null;
    var fn = overload([
      [overload.numberOptionalWithDefault(5), overload.func, function (n) {
        called++;
        val = n;
      }]
    ]);
    fn(3, function() {});
    test.equals(called, 1, 'overload not called');
    test.equals(val, 3);
    test.done();
  },

  'number optional parameter, called with zero': function (test) {
    var called = 0;
    var val = null;
    var fn = overload([
      [overload.numberOptionalWithDefault(5), overload.func, function (n) {
        called++;
        val = n;
      }]
    ]);
    fn(0, function() {});
    test.equals(called, 1, 'overload not called');
    test.equals(val, 0);
    test.done();
  },

  'string optional parameter, called with empty string': function (test) {
    var called = 0;
    var val = null;
    var fn = overload([
      [overload.stringOptionalWithDefault("hello world"), overload.func, function (n) {
        called++;
        val = n;
      }]
    ]);
    fn("", function() {});
    test.equals(called, 1, 'overload not called');
    test.equals(val, "");
    test.done();
  },

  'callback, with default value': function (test) {
    var called = 0;
    var fn = overload([
      [overload.callbackOptional, function (callback) {
        callback();
      }]
    ]);
    fn(function () { called++; });
    test.equals(called, 1, 'overload not called');
    test.done();
  },

  'multiple optionals': function (test) {
    var called = 0;
    var args;
    var fn = overload([
      [overload.string, overload.arrayOptionalWithDefault(null), overload.callbackOptional, function (str, arr, callback) {
        args = arguments;
        called++;
      }]
    ]);
    fn('test');
    test.equals(called, 1, 'overload not called');
    test.equals(args.length, 3);
    test.equals(args[0], 'test');
    test.ok(args[1] === null);
    test.equals(typeof(args[2]), 'function');
    test.done();
  },

  'multiple optionals, skipping middle one': function (test) {
    var called = 0;
    var args;
    var fn = overload([
      [overload.string, overload.arrayOptional, overload.callbackOptional, function (str, arr, callback) {
        args = arguments;
        called++;
      }]
    ]);
    var fnTest = function zzz() {};
    fn('test', fnTest);
    test.equals(called, 1, 'overload not called');
    test.equals(args.length, 3);
    test.equals(args[0], 'test');
    test.ok(args[1] === undefined, 'invalid argument, expected undefined: ' + args[1]);
    test.equals(args[2].name, 'zzz');
    test.done();
  },

  'multiple optionals, null middle one': function (test) {
    var called = 0;
    var args;
    var fn = overload([
      [overload.string, overload.arrayOptional, overload.callbackOptional, function (str, arr, callback) {
        args = arguments;
        called++;
      }]
    ]);
    var fnTest = function zzz() {};
    fn('test', null, fnTest);
    test.equals(called, 1, 'overload not called');
    test.equals(args.length, 3);
    test.equals(args[0], 'test');
    test.ok(args[1] === undefined, 'invalid argument, expected undefined: ' + args[1]);
    test.equals(args[2].name, 'zzz');
    test.done();
  },

  'complex': function (test) {
    var called = 0;
    var args = null;
    var fn = overload([
      [overload.string, function () { test.fail('this function should not be called'); }],
      [overload.string, overload.number, overload.funcOptional, function () {
        args = Array.prototype.slice.call(arguments, 0);
        called++;
      }]
    ]);
    var argFn = function () {};
    fn('test', 5, argFn);
    test.equals(called, 1, 'overload not called');
    test.deepEqual(args, ['test', 5, argFn], 'overload called with wrong args');
    test.done();
  }
};