create tests

modules/ecs6-class/line.js

@@ -2,17 +2,29 @@ const Point = require("./point");
 
 class Line {
     constructor({ point1 = new Point(), point2 = new Point(), n = undefined, slope = undefined }) {
+        if(typeof(point1)!="object" && point1 !=undefined || typeof(point2)!="object" && point2 !=undefined){
+            throw new Error('argument must be type point')
+        }
+        if (typeof(n)!="number"&& n !=undefined|| typeof(slope)!="number" && slope !=undefined){
+            throw new Error('argument must be type number')
+        }
         this.point1 = point1;
         this.point2 = point2;
         this.slope = slope;
         this.n = n;
     }
 
     calculateSlope = () => {
+        if( this.point1.x==this.point1.y && this.point1.y==0 || this.point2.x==this.point2.y &&  this.point2.y==0){
+            throw new Error("missing data")
+        }
         this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x)
     }
 
     calculateNOfLineFunction = () => {
+        if(this.slope==undefined || this.point1==undefined){
+            throw new Error("missing data")
+        }
         this.n = this.point1.y - this.slope * this.point1.x
     }
 
@@ -26,14 +38,20 @@ class Line {
 
 
     getPointByX(x) {
+        if(typeof(x)!="number"){
+            throw new Error('argument must be type number')
+        }
         let y = this.slope * x + this.n
         return new Point({ x, y })
     }
 
     getPointByY(y) {
+        if(typeof(y)!="number"){
+            throw new Error('argument must be type number')
+        }
         let x = (y - this.n) / this.slope;
         return new Point({ x, y })
     }
 }
 
-module.exports = Line
+module.exports = Line

modules/ecs6-class/point.js

@@ -1,14 +1,23 @@
 class Point {
     constructor({x=0, y=0}={}) {
+        if(typeof(x)!="number" || typeof(y)!="number"){
+            throw new Error('argument must be type number')
+        }
         this.x = x;
         this.y = y;
     }
     moveVertical(value) {
+        if(typeof(value)!="number"){
+            throw new Error('argument must be type number')
+        }
         this.y += value;
     }
     moveHorizontal(value) {
+        if(typeof(value)!="number"){
+            throw new Error('argument must be type number')
+        }
         this.x += value;
     }
 }
 
-module.exports = Point
+module.exports = Point

modules/geometry-calculation.js

@@ -1,13 +1,24 @@
 const Line = require('./ecs6-class/line')
+const Point = require('./ecs6-class/point')
 
 const calculateDistance = (point1, point2) => {
+    if(!point1 || !point2){
+        throw new Error('missing data')
+    }
+    if(typeof(point1)!= 'object' |typeof(point2)!='object'){
+        throw new Error('argument must by type point')
+    }
+
     let distanceX = (point2.x - point1.x) ** 2;
-    let distanceY = (point2.y - point2.y) ** 2;
+    let distanceY = (point2.y - point1.y) ** 2;
     const distance = Math.sqrt(distanceX + distanceY);
     return distance;
 }
 
 const calculateJunctionPoint = (line1, line2) => {
+    if(line1==undefined || line2==undefined){
+        throw new Error("missing data")
+    }
     if (line1.slope === line2.slope) {
         if (line1.n === line2.n) {
             return true
@@ -24,6 +35,9 @@ const calculateJunctionPoint = (line1, line2) => {
 }
 
 const isPointOnLine = (line, point) => {
+    if(line==undefined || point==undefined){
+        throw new Error("missing data")
+    }
     const proxyLine = new Line({ point1: line.point1, point2: point })
     proxyLine.calculateSlope()
     if (line.slope === proxyLine.slope) {
@@ -40,3 +54,6 @@ module.exports = {
     calculateJunctionPoint,
     isPointOnLine
 }
+
+
+

package.json

@@ -4,7 +4,8 @@
   "description": "practice unit tests in javascript",
   "main": "index.js",
   "scripts": {
-    "test": "jest"
+    "test": "jest",
+    "test:coverage":  "jest --coverage"
   },
   "dependencies": {
     "jest": "^29.7.0"