array-reverse/test.js at main · frosted-javascript/array-reverse · GitHub

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constassert=require("assert")
constreverse=require(".")

describe("reverse()",()=>{
it("should reverse a standard array of numbers",()=>{
constinput=[1,2,3]
constexpected=[3,2,1]
assert.deepStrictEqual(reverse(input),expected)
})

it("should work with an array of strings",()=>{
constinput=["a","b","c","d"]
constexpected=["d","c","b","a"]
assert.deepStrictEqual(reverse(input),expected)
})

it("should return a single-element array unchanged",()=>{
constinput=[100]
assert.deepStrictEqual(reverse(input),input)
})

it("should throw an error when the input is not an array",()=>{
assert.throws(()=>{
reverse("not an array")
},/Expectsanarray/)
})

it("should return empty array unchanged",()=>{
assert.deepStrictEqual(reverse([]),[])
})

it("should handle a 15k length array",()=>{
constsize=15000
constinput=Array.from({length: size},(_,i)=>i)

constexpected=[...input].reverse()

constresult=reverse(input)

assert.strictEqual(result.length,size)
assert.deepStrictEqual(result,expected)
})
})