Practicing testing skills with Jest in Node
Assignment
Write tests for the following, and then make the tests pass!
-
A
capitalize
function that takes a string and returns it with the first character capitalized. -
A
reverseString
function that takes a string and returns it reversed. -
A
calculator
object that contains functions for the basic operations:add
,subtract
,divide
, andmultiply
. Each of these functions should take two numbers and return the correct calculation. -
A
caesarCipher
function that takes a string and returns it with each character “shifted”. Read more about how a Caesar cipher works on this website.- Don’t forget to test wrapping from
z
toa
. - Don’t forget to test keeping the same case.
- Don’t forget to test punctuation!
- For this one, you may want to split the final function into a few smaller functions. One concept of Testing is that you don’t need to explicitly test every function you write… Just the public ones. So in this case you only need tests for the final
caesarCipher
function. If it works as expected you can rest assured that your smaller helper functions are doing what they’re supposed to.
- Don’t forget to test wrapping from
-
An
analyzeArray
function that takes an array of numbers and returns an object with the following properties:average
,min
,max
, andlength
.const object = analyzeArray([1,8,3,4,2,6]); object == { average: 4, min: 1, max: 8, length: 6 };