https://github.com/freenowtech/4yfn-kata
Coding kata for the 2018 4yfn event
https://github.com/freenowtech/4yfn-kata
Last synced: 12 months ago
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Coding kata for the 2018 4yfn event
- Host: GitHub
- URL: https://github.com/freenowtech/4yfn-kata
- Owner: freenowtech
- License: mit
- Created: 2018-02-21T14:27:37.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2018-12-28T16:50:19.000Z (over 7 years ago)
- Last Synced: 2025-03-30T01:01:51.474Z (about 1 year ago)
- Language: Java
- Size: 352 KB
- Stars: 0
- Watchers: 2
- Forks: 1
- Open Issues: 1
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Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 4yfn-kata
Coding kata for the 2018 4yfn event. The following is a TDD Kata, an exercise in coding, refactoring and test-first.
## Before you start
* Try not to read ahead.
* Do one task at a time. The trick is to learn to work incrementally.
* Make sure you only test for correct inputs. There is no need to test for invalid inputs for this kata.
* There are several folders , each one belonging to a specific language or technology in which you can solve the exercise.
* **Follow the red-green-refactor approach**
## Instructions
* Please create a separate git branch from master with your solution
* ``` git checkout master```
* ``` git pull origin master```
* ``` git checkout -b ``` ( to create a branch from master). As branch name we suggest you to use your name and surname separated by underscores( e.g. markus_wallace)
* Commit each one of the requested tasks separately :
* ``` git add -u . ```
* ``` git commit -m ""```
* Push your changes :
* ``` git push origin ```
* The user and passwords if required will be given at the momment of solving the exercise
## The kata
### Step 1: the simplest thing
Create a simple String calculator with a method `int add(String numbers)`.
* The string argument can contain 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example `""` or `"1"` or `"1,2"`.
* Start with the simplest test case of an empty string and move to one and two numbers.
* Remember to solve things as simply as possible so that you force yourself to write tests you did not think about.
* Remember to refactor after each passing test.
### Step 2: handle an unknown amount of numbers
Allow the `add()` method to handle an unknown amount of numbers.
### Step 3: handle new lines between numbers
Allow the `add()` method to handle new lines between numbers (instead of commas).
* the following input is ok: `"1\n2,3"` (will equal 6)
* the following input is NOT ok: `"1,\n"` (not need to prove it - just clarifying)
### Step 4: negative numbers
Calling `add()` with a negative number will throw an exception `"negatives not allowed"` - and the negative that was passed.
For example `add("1,4,-1")` should throw an exception with the message `"negatives not allowed: -1"`.
If there are multiple negatives, show all of them in the exception message.
### Step 5: ignore big numbers
Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2