style: cleanup PascalTriangle (TheAlgorithms#1606)

* tests: add missing tests for `PascalTriangle` * style: remove redundant branch in `generate` * tests: simplify tests of `PascalTriangle`

Author: vil02

Maths/PascalTriangle.js

@@ -17,8 +17,6 @@ const generate = (numRows) =>{
 return[]
 }elseif(numRows===1){
 return[[1]]
-}elseif(numRows===2){
-return[[1],[1,1]]
 }else{
 for(leti=2;i<numRows;i++){
 addRow(triangle)

Maths/test/PascalTriangle.test.js

@@ -1,20 +1,20 @@
+import{expect}from'vitest'
 import{generate}from'../PascalTriangle'
 
 describe('Pascals Triangle',()=>{
-it('should have the the same length as the number',()=>{
-constpascalsTriangle=generate(5)
-expect(pascalsTriangle.length).toEqual(5)
-})
-it('should have same length as its index in the array',()=>{
-constpascalsTriangle=generate(5)
+it.each([
+[0,[]],
+[1,[[1]]],
+[2,[[1],[1,1]]],
+[3,[[1],[1,1],[1,2,1]]],
+[4,[[1],[1,1],[1,2,1],[1,3,3,1]]],
+[5,[[1],[1,1],[1,2,1],[1,3,3,1]],[1,4,6,4,1]]
+])('check with %j',(input,expected)=>{
+constpascalsTriangle=generate(input)
+expect(pascalsTriangle.length).toEqual(input)
 pascalsTriangle.forEach((arr,index)=>{
 expect(arr.length).toEqual(index+1)
 })
-})
-it('should return an array of arrays',()=>{
-constpascalsTriangle=generate(3)
-expect(pascalsTriangle).toEqual(
-expect.arrayContaining([[1],[1,1],[1,2,1]])
-)
+expect(pascalsTriangle).toEqual(expect.arrayContaining(expected))
 })
 })