add test

jest.config.js

@@ -0,0 +1,9 @@
+const { createDefaultPreset } = require("ts-jest");
+
+const tsJestTransformCfg = createDefaultPreset().transform;
+
+/** @type {import("jest").Config} **/
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

modules/ecs6-class/line.ts

@@ -1,50 +1,63 @@
 import Point from "./point";
 
 export default class Line {
-    point1: Point
-    point2: Point
-    n: number | undefined
-    slope: number | undefined
+    point1: Point;
+    point2: Point;
+    n: number | undefined;
+    slope: number | undefined;
+
     constructor({ point1 = new Point(), point2 = new Point(), n = undefined, slope = undefined }: { point1?: Point, point2?: Point, n?: number, slope?: number } = {}) {
         this.point1 = point1;
         this.point2 = point2;
         this.slope = slope;
         this.n = n;
     }
-
-
-
+    setPoints(p1: Point, p2: Point) {
+        this.point1 = p1;
+        this.point2 = p2;
+    }
     calculateSlope() {
-        this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x)
+        const dx = this.point2.x - this.point1.x;
+        if (dx === 0) {
+            this.slope = undefined; 
+        } else {
+            this.slope = (this.point2.y - this.point1.y) / dx;
+        }
+        return this.slope;
     }
 
     calculateNOfLineFunction() {
-        if (this.slope)
-            this.n = this.point1.y - this.slope * this.point1.x
+        this.calculateSlope();
+        if (this.slope !== undefined) {
+            this.n = this.point1.y - this.slope * this.point1.x;
+        } else {
+            this.n = undefined; 
+        }
     }
 
     getPointOnXAsis() {
-        return this.getPointByY(0)
+        this.calculateNOfLineFunction();
+        return this.getPointByY(0);
     }
 
     getPointOnYAsis() {
-        return this.getPointByX(0)
+        this.calculateNOfLineFunction();
+        return this.getPointByX(0);
     }
 
-
     getPointByX(x: number) {
-        if (this.slope && this.n) {
-            let y = this.slope * x + this.n
-            return new Point({ x, y })
-        }
+        if (this.slope === undefined) this.calculateSlope();
+        if (this.n === undefined) this.calculateNOfLineFunction();
+        if (this.slope === undefined || this.n === undefined) return undefined;
+        const y = this.slope * x + this.n;
+        return new Point({ x, y });
     }
 
     getPointByY(y: number) {
-        if (this.slope && this.n) {
-            let x = (y - this.n) / this.slope;
-            return new Point({ x, y })
-        }
+        if (this.slope === undefined) this.calculateSlope();
+        if (this.n === undefined) this.calculateNOfLineFunction();
+        if (this.slope === undefined || this.n === undefined) return undefined;
+        const x = (y - this.n) / this.slope;
+        return new Point({ x, y });
     }
-
-
-}
+}

modules/geometry-calculation.ts

@@ -3,12 +3,14 @@ import Point from './ecs6-class/point';
 
 export const calculateDistance = (point1: Point, point2: Point): number => {
     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;
 }
 
 export const calculateJunctionPoint = (line1: Line, line2: Line): Boolean | Point | undefined => {
+    line1.calculateNOfLineFunction();
+    line2.calculateNOfLineFunction();
     if (line1.slope === line2.slope) {
         if (line1.n === line2.n) {
             return true
@@ -24,9 +26,11 @@ export const calculateJunctionPoint = (line1: Line, line2: Line): Boolean | Poin
             return junctionPoint
         }
     }
+   return undefined; 
 }
 
 export const isPointOnLine = (line: Line, point: Point): Boolean => {
+    line.calculateNOfLineFunction();
     const proxyLine = new Line({ point1: line.point1, point2: point })
     proxyLine.calculateSlope()
     if (line.slope === proxyLine.slope) {

package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "jest"
+    "test": "jest",
+    "coverage": "jest --coverage"
   },
   "repository": {
     "type": "git",
@@ -22,6 +23,7 @@
   "devDependencies": {
     "@types/jest": "^30.0.0",
     "jest": "^30.0.4",
+    "ts-jest": "^29.4.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.8.3"
   }