IBM Cloud Garage Method

javascript test-driven-development [TDD]

This repository is used for the IBM Garage Method TDD course to illistrate the fundamentals of TDD using javascript

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Getting Started

Prerequisites

You will need the following installed

• Node.js
• Git command line

Clone the repo, install and run the tests:

To setup and execute the tests perform the following in a terminal window

git clone git@github.com:ibm-cloud-academy/javascript-tdd.git
cd javascript-tdd
npm install mocha --save-dev
npm install should --save-dev
npm test

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References

The Four Rules of Simple Design:

• Passes the tests
• Reveals intention
• No duplication
• Fewest elements

The Transformation Priority Premise:

(01) [{} –> nil] no code => return nil

(02) [nil->constant] nil => simple constant

(03) [constant->constant+] simple constant => complex constant

(04) [constant->scalar] complex constant => variable or an argument

(05) [statement->statements] adding more unconditional statements.

(06) [unconditional->if] splitting the execution path

(07) [scalar->array]

(08) [array->container]

(09) [statement->recursion]

(10) [if->while]

(11) [expression->function] replacing an expression with a function or algorithm

(12) [variable->assignment] replacing the value of a variable.

Simplified Transformation Priority Premise:

(01) constant => a value

(02) scalar => a local binding, or variable

(03) invocation => calling a function/method

(04) conditional => if/switch/case/cond

(05) while loop => applies to for loops as well

(06) assignment => replacing the value of a variable

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