theZieger /
inherits.js
| Conditions | 1 |
| Paths | 1 |
| Total Lines | 80 |
| Lines | 0 |
| Ratio | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
| 1 | var inherits = require('../src/inherits.js'); |
||
| 3 | describe('inherits', function() { |
||
| 4 | describe('failing tests', function() { |
||
| 5 | it("should fail because the Constructor is undefined", function() { |
||
| 6 | expect(inherits.bind()).toThrowError(TypeError); |
||
| 7 | }); |
||
| 8 | |||
| 9 | it("should fail because the Constructor is null", function() { |
||
| 10 | expect(inherits.bind(null, null)).toThrowError(TypeError); |
||
| 11 | }); |
||
| 12 | |||
| 13 | it("should fail because the SuperConstructor is undefined", function() { |
||
| 14 | expect(inherits.bind(null, function() {})).toThrowError(TypeError); |
||
| 15 | }); |
||
| 16 | |||
| 17 | it("should fail because the SuperConstructor is null", function() { |
||
| 18 | expect(inherits.bind(null, function() {}, null)).toThrowError(TypeError); |
||
| 19 | }); |
||
| 20 | |||
| 21 | it("should fail because the SuperConstructor has no prototype", function() { |
||
| 22 | expect(inherits.bind(null, function() {}, [])).toThrowError(TypeError); |
||
| 23 | }); |
||
| 24 | }); |
||
| 25 | |||
| 26 | describe('successful tests', function() { |
||
| 27 | // test example from README.md |
||
| 28 | var SuperClass = function() { |
||
| 29 | this.someProperty = 42; |
||
| 30 | }; |
||
| 31 | |||
| 32 | SuperClass.prototype.retMsg = function(msg) { |
||
| 33 | return msg; |
||
| 34 | }; |
||
| 35 | |||
| 36 | SuperClass.prototype.getSomeProp = function() { |
||
| 37 | return this.someProperty; |
||
| 38 | }; |
||
| 39 | |||
| 40 | // a class we want to inherit from SuperClass |
||
| 41 | var SomeClass = function() { |
||
| 42 | SuperClass.call(this); |
||
| 43 | }; |
||
| 44 | |||
| 45 | inherits(SomeClass, SuperClass); |
||
| 46 | |||
| 47 | SomeClass.prototype.flop = function(msg) { |
||
| 48 | return this.retMsg(msg); |
||
| 49 | }; |
||
| 50 | |||
| 51 | var someClass_instance = new SomeClass(); |
||
| 52 | // end test example from README.md |
||
| 53 | |||
| 54 | it("should be able to access inherited properties", function() { |
||
| 55 | expect(someClass_instance.someProperty).toEqual(42); |
||
| 56 | }); |
||
| 57 | |||
| 58 | it("should be able to run inherited methods", function() { |
||
| 59 | expect(someClass_instance.retMsg('hi')).toEqual('hi'); |
||
| 60 | }); |
||
| 61 | |||
| 62 | it("should be able to run inherited methods by using the this keyword", function() { |
||
| 63 | expect(someClass_instance.flop('hi')).toEqual('hi'); |
||
| 64 | }); |
||
| 65 | |||
| 66 | it("should be instance of SomeClass", function() { |
||
| 67 | expect((someClass_instance instanceof SomeClass)).toEqual(true); |
||
| 68 | }); |
||
| 69 | |||
| 70 | it("should be instance of SuperClass", function() { |
||
| 71 | expect((someClass_instance instanceof SuperClass)).toEqual(true); |
||
| 72 | }); |
||
| 73 | |||
| 74 | it("should set SuperClass contructor", function() { |
||
| 75 | expect(someClass_instance.constructor.super_ === SuperClass).toEqual(true); |
||
| 76 | }); |
||
| 77 | |||
| 78 | it("should set contructor", function() { |
||
| 79 | expect(someClass_instance.constructor === SomeClass).toEqual(true); |
||
| 80 | }); |
||
| 81 | }); |
||
| 82 | }); |
||
| 83 |
