Add Jest config and add/update tests for TypeScript project

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

modules/ecs6-class/line.ts

@@ -15,11 +15,14 @@ export default class Line {
 
 
     calculateSlope() {
-        this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x)
+        if (this.point1.x === this.point2.x) {
+            throw new Error("Vertical line - slope is undefined");
+        }
+        this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x);
     }
 
     calculateNOfLineFunction() {
-        if (this.slope)
+        if (this.slope !== undefined)
             this.n = this.point1.y - this.slope * this.point1.x
     }
 
@@ -33,14 +36,14 @@ export default class Line {
 
 
     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.n !== undefined) {
+        let y = this.slope * x + this.n;
+        return new Point({ x, y });
     }
+}
 
     getPointByY(y: number) {
-        if (this.slope && this.n) {
+       if (this.slope !== undefined && this.n !== undefined) {
             let x = (y - this.n) / this.slope;
             return new Point({ x, y })
         }

modules/geometry-calculation.ts

@@ -3,39 +3,56 @@ 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 => {
+    // ודא שלשני הקווים יש slope ו-n
+    if (line1.slope === undefined) line1.calculateSlope?.();
+    if (line1.n === undefined) line1.calculateNOfLineFunction?.();
+    if (line2.slope === undefined) line2.calculateSlope?.();
+    if (line2.n === undefined) line2.calculateNOfLineFunction?.();
+
     if (line1.slope === line2.slope) {
         if (line1.n === line2.n) {
-            return true
-        }
-        else {
-            return false
+            return true;
+        } else {
+            return false;
         }
-    }
-    else {
-        if (line1.n !== undefined && line1.slope !== undefined && line2.n !== undefined && line2.slope !== undefined) {
-            const x = (line1.n - line2.n) / (line2.slope - line1.slope)
+    } else {
+        if (
+            line1.n !== undefined && line1.slope !== undefined &&
+            line2.n !== undefined && line2.slope !== undefined
+        ) {
+            const x = (line1.n - line2.n) / (line2.slope - line1.slope);
             const junctionPoint = line1.getPointByX(x);
-            return junctionPoint
+            return junctionPoint;
         }
     }
 }
 
 export const isPointOnLine = (line: Line, point: Point): Boolean => {
-    const proxyLine = new Line({ point1: line.point1, point2: point })
-    proxyLine.calculateSlope()
-    if (line.slope === proxyLine.slope) {
-        proxyLine.calculateNOfLineFunction()
-        if (line.n === proxyLine.n) {
-            return true
+    if (line.slope === undefined) line.calculateSlope?.();
+    if (line.n === undefined) line.calculateNOfLineFunction?.();
+
+    const proxyLine = new Line({ point1: line.point1, point2: point });
+    proxyLine.calculateSlope();
+    if (
+        line.slope !== undefined &&
+        proxyLine.slope !== undefined &&
+        Math.abs(line.slope - proxyLine.slope) < 1e-10
+    ) {
+        proxyLine.calculateNOfLineFunction();
+        if (
+            line.n !== undefined &&
+            proxyLine.n !== undefined &&
+            Math.abs(line.n - proxyLine.n) < 1e-10
+        ) {
+            return true;
         }
     }
-    return false
+    return false;
 }
 
-

package.json

@@ -22,6 +22,7 @@
   "devDependencies": {
     "@types/jest": "^30.0.0",
     "jest": "^30.0.4",
+    "ts-jest": "^29.4.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.8.3"
   }