testing-student-object's Introduction

Testing a Student Object

Using what we learned today with Mocha and Chai, let's develop some tests for student objects.

Here's the code we've just written and want to test:

// student.js
function Student(firstName, lastName) {
  this.firstName = firstName;
  this.lastName = lastName;
}

Student.prototype.getFirstName = function() {
  return this.firstName;
}

Student.prototype.getLastName = function() {
  return this.lastName;
}

Student.prototype.getFullName = function() {
  return this.firstName + ' ' + this.lastName;
}

Student.prototype.getGreeting = function() {
  return 'Good day mate, my name is ' + this.firstName;
}

module.exports = Student;

Create package.json

$ npm init

Follow the prompts and just use the defaults if you prefer

Install Mocha and Chai

$ npm install mocha --save-dev
$ npm install chai --save-dev

Create the student library file

$ touch student.js

Paste the code above into this file

Create the test directory and test file

$ mkdir test && cd test
$ touch student_tests.js

Your directory structure should look something like this now:

├── node_modules/
├── package.json
├── student.js
└── test/
    └── student_tests.js

Write tests for every method of `Student`

Use describe to explain your tests
Use either assert, expect, or should for your tests. The choice is yours.

Challenge

Modify the student object so that if there's no last name passed, it defaults to 'Doe'. Write a new test to ensure that it works as expected.
Modify the student object so that an age can also be passed in. Write tests that ensure it's a valid number and that the value is within a reasonably acceptable range.

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