diff --git a/modules/ecs6-class/line.ts b/modules/ecs6-class/line.ts
index e2d6086..71a9f40 100644
--- a/modules/ecs6-class/line.ts
+++ b/modules/ecs6-class/line.ts
@@ -1,50 +1,56 @@
 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;
     }
-
-  
-
     calculateSlope() {
-        this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x)
+        this.slope = (this.point1.y - this.point2.y) / (this.point1.x - this.point2.x);
     }
-
     calculateNOfLineFunction() {
-        if (this.slope)
-            this.n = this.point1.y - this.slope * this.point1.x
+        if (this.slope !== undefined) {
+            this.n = this.point1.y - this.slope * this.point1.x;
+        }
+    }
+    ensureSlopeAndN() {
+        if (this.slope === undefined) {
+            this.calculateSlope();
+        }
+        if (this.n === undefined) {
+            this.calculateNOfLineFunction();
+        }
     }
 
     getPointOnXAsis() {
-        return this.getPointByY(0)
+        this.ensureSlopeAndN();
+        return this.getPointByY(0);
     }
-
     getPointOnYAsis() {
-        return this.getPointByX(0)
+        this.ensureSlopeAndN();
+        return this.getPointByX(0);
     }
-
-
     getPointByX(x: number) {
-        if (this.slope && this.n) {
-            let y = this.slope * x + this.n
-            return new Point({ x, y })
+        this.ensureSlopeAndN();
+        if (this.slope !== undefined && this.n !== 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 })
+        this.ensureSlopeAndN();
+        if (this.slope !== undefined && this.n !== undefined) {
+            const x = (y - this.n) / this.slope;
+            return new Point({ x, y });
         }
     }
 
-
-}
+    
+}
\ No newline at end of file
diff --git a/modules/tests/line.test.ts b/modules/tests/line.test.ts
new file mode 100644
index 0000000..5aa6c89
--- /dev/null
+++ b/modules/tests/line.test.ts
@@ -0,0 +1,99 @@
+import Line from "../ecs6-class/line";
+import Point from "../ecs6-class/point";
+
+describe("Line Class", () => {
+    test("Constructor initializes correctly", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 4 });
+        const line = new Line({ point1, point2 });
+        expect(line.point1).toEqual(point1);
+        expect(line.point2).toEqual(point2);
+        expect(line.slope).toBeUndefined();
+        expect(line.n).toBeUndefined();
+    });
+
+    test("calculateSlope calculates slope correctly", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        expect(line.slope).toBe(2); 
+    });
+
+    test("calculateNOfLineFunction calculates n correctly", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        line.calculateNOfLineFunction();
+        expect(line.n).toBe(0); 
+    });
+
+    test("ensureSlopeAndN ensures slope and n are calculated", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+
+        expect(line.slope).toBeUndefined();
+        expect(line.n).toBeUndefined();
+
+        line.ensureSlopeAndN();
+
+        expect(line.slope).toBe(2);
+        expect(line.n).toBe(0);
+    });
+
+    test("getPointOnXAsis returns correct point", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        line.calculateNOfLineFunction();
+        const pointOnXAxis = line.getPointOnXAsis();
+        expect(pointOnXAxis).toEqual(new Point({ x: 0, y: 0 }));
+    });
+
+    test("getPointOnYAsis returns correct point", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        line.calculateNOfLineFunction();
+        const pointOnYAxis = line.getPointOnYAsis();
+        expect(pointOnYAxis).toEqual(new Point({ x: 0, y: 0 }));
+    });
+
+    test("getPointByX calculates point correctly", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        line.calculateNOfLineFunction();
+        const point = line.getPointByX(2);
+        expect(point).toEqual(new Point({ x: 2, y: 4 })); 
+    });
+
+    test("getPointByY calculates point correctly", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        line.calculateSlope();
+        line.calculateNOfLineFunction();
+        const point = line.getPointByY(4);
+        expect(point).toEqual(new Point({ x: 2, y: 4 }));  
+    });
+
+    test("getPointByX handles undefined slope or n", () => {
+        const point1 = new Point({ x: 1, y: 2 });
+        const point2 = new Point({ x: 3, y: 6 });
+        const line = new Line({ point1, point2 });
+        
+        expect(line.slope).toBeUndefined();
+        expect(line.n).toBeUndefined();
+
+        line.getPointByX(2); 
+
+        expect(line.slope).toBe(2); 
+        expect(line.n).toBe(0); 
+    });
+});
diff --git a/modules/tests/point.test.ts b/modules/tests/point.test.ts
new file mode 100644
index 0000000..ca4acbe
--- /dev/null
+++ b/modules/tests/point.test.ts
@@ -0,0 +1,67 @@
+import Point from "../ecs6-class/point";
+import Line from "../ecs6-class/line";
+// filepath: d:\chany waingort\build-tests-ts\modules\ecs6-class\point.test.ts
+
+describe("Point Class", () => {
+    test("Constructor initializes correctly", () => {
+        const point = new Point({ x: 5, y: 10 });
+        expect(point.x).toBe(5);
+        expect(point.y).toBe(10);
+    });
+
+    test("Constructor initializes with default values", () => {
+        const point = new Point();
+        expect(point.x).toBe(0);
+        expect(point.y).toBe(0);
+    });
+
+    test("moveVertical moves the point vertically", () => {
+        const point = new Point({ x: 5, y: 10 });
+        point.moveVertical(3);
+        expect(point.y).toBe(13); // 10 + 3
+    });
+
+    test("moveHorizontal moves the point horizontally", () => {
+        const point = new Point({ x: 5, y: 10 });
+        point.moveHorizontal(-2);
+        expect(point.x).toBe(3); // 5 - 2
+    });
+});
+
+test("Constructor initializes with default values", () => {
+    const line = new Line();
+    expect(line.point1).toEqual(new Point());
+    expect(line.point2).toEqual(new Point());
+    expect(line.slope).toBeUndefined();
+    expect(line.n).toBeUndefined();
+});
+
+test("Constructor initializes with custom values", () => {
+    const point1 = new Point({ x: 1, y: 2 });
+    const point2 = new Point({ x: 3, y: 4 });
+    const line = new Line({ point1, point2, slope: 2, n: 0 });
+    expect(line.point1).toEqual(point1);
+    expect(line.point2).toEqual(point2);
+    expect(line.slope).toBe(2);
+    expect(line.n).toBe(0);
+});
+
+test("getPointOnXAsis returns correct point", () => {
+    const point1 = new Point({ x: 1, y: 2 });
+    const point2 = new Point({ x: 3, y: 6 });
+    const line = new Line({ point1, point2 });
+    line.calculateSlope();
+    line.calculateNOfLineFunction();
+    const pointOnXAxis = line.getPointOnXAsis();
+    expect(pointOnXAxis).toEqual(new Point({ x: 0, y: 0 }));
+});
+
+test("getPointOnYAsis returns correct point", () => {
+    const point1 = new Point({ x: 1, y: 2 });
+    const point2 = new Point({ x: 3, y: 6 });
+    const line = new Line({ point1, point2 });
+    line.calculateSlope();
+    line.calculateNOfLineFunction();
+    const pointOnYAxis = line.getPointOnYAsis();
+    expect(pointOnYAxis).toEqual(new Point({ x: 0, y: 0 }));
+});
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 5bc5ea8..3da30fe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,6 +11,7 @@
       "devDependencies": {
         "@types/jest": "^30.0.0",
         "jest": "^30.0.4",
+        "ts-jest": "^29.4.0",
         "ts-node": "^10.9.2",
         "typescript": "^5.8.3"
       }
@@ -1662,6 +1663,13 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "node_modules/async": {
+      "version": "3.2.6",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
+      "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/babel-jest": {
       "version": "30.0.4",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-30.0.4.tgz",
@@ -1823,6 +1831,19 @@
         "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
       }
     },
+    "node_modules/bs-logger": {
+      "version": "0.2.6",
+      "resolved": "https://registry.npmjs.org/bs-logger/-/bs-logger-0.2.6.tgz",
+      "integrity": "sha512-pd8DCoxmbgc7hyPKOvxtqNcjYoOsABPQdcCUjGp3d42VR2CX1ORhk2A87oqqu5R1kk+76nsxZupkmyd+MVtCog==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fast-json-stable-stringify": "2.x"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/bser": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/bser/-/bser-2.1.1.tgz",
@@ -2153,6 +2174,22 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/ejs": {
+      "version": "3.1.10",
+      "resolved": "https://registry.npmjs.org/ejs/-/ejs-3.1.10.tgz",
+      "integrity": "sha512-UeJmFfOrAQS8OJWPZ4qtgHyWExa088/MtK5UEyoJGFH67cDEXkZSviOiKRCZ4Xij0zxI3JECgYs3oKx+AizQBA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "jake": "^10.8.5"
+      },
+      "bin": {
+        "ejs": "bin/cli.js"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/electron-to-chromium": {
       "version": "1.5.181",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.181.tgz",
@@ -2300,6 +2337,29 @@
         "bser": "2.1.1"
       }
     },
+    "node_modules/filelist": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/filelist/-/filelist-1.0.4.tgz",
+      "integrity": "sha512-w1cEuf3S+DrLCQL7ET6kz+gmlJdbq9J7yXCSjK/OZCPA+qEN1WyF4ZAf0YYJa4/shHJra2t/d/r8SV4Ji+x+8Q==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "minimatch": "^5.0.1"
+      }
+    },
+    "node_modules/filelist/node_modules/minimatch": {
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.6.tgz",
+      "integrity": "sha512-lKwV/1brpG6mBUFHtb7NUmtABCb2WZZmm2wNiOA5hAb8VdCS4B3dtMWyvcoViccwAW/COERjXLt0zP1zXUN26g==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/fill-range": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
@@ -2681,6 +2741,49 @@
         "@pkgjs/parseargs": "^0.11.0"
       }
     },
+    "node_modules/jake": {
+      "version": "10.9.2",
+      "resolved": "https://registry.npmjs.org/jake/-/jake-10.9.2.tgz",
+      "integrity": "sha512-2P4SQ0HrLQ+fw6llpLnOaGAvN2Zu6778SJMrCUwns4fOoG9ayrTiZk3VV8sCPkVZF8ab0zksVpS8FDY5pRCNBA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "async": "^3.2.3",
+        "chalk": "^4.0.2",
+        "filelist": "^1.0.4",
+        "minimatch": "^3.1.2"
+      },
+      "bin": {
+        "jake": "bin/cli.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/jake/node_modules/brace-expansion": {
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/jake/node_modules/minimatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/jest": {
       "version": "30.0.4",
       "resolved": "https://registry.npmjs.org/jest/-/jest-30.0.4.tgz",
@@ -3371,6 +3474,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/lodash.memoize": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
+      "integrity": "sha512-t7j+NzmgnQzTAYXcsHYLgimltOV1MXHtlOWf6GjL9Kj8GK5FInw5JotxvbOs+IvV1/Dzo04/fCGfLVs7aXb4Ag==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lru-cache": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
@@ -4221,6 +4331,85 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/ts-jest": {
+      "version": "29.4.0",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.4.0.tgz",
+      "integrity": "sha512-d423TJMnJGu80/eSgfQ5w/R+0zFJvdtTxwtF9KzFFunOpSeD+79lHJQIiAhluJoyGRbvj9NZJsl9WjCUo0ND7Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bs-logger": "^0.2.6",
+        "ejs": "^3.1.10",
+        "fast-json-stable-stringify": "^2.1.0",
+        "json5": "^2.2.3",
+        "lodash.memoize": "^4.1.2",
+        "make-error": "^1.3.6",
+        "semver": "^7.7.2",
+        "type-fest": "^4.41.0",
+        "yargs-parser": "^21.1.1"
+      },
+      "bin": {
+        "ts-jest": "cli.js"
+      },
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || ^18.0.0 || >=20.0.0"
+      },
+      "peerDependencies": {
+        "@babel/core": ">=7.0.0-beta.0 <8",
+        "@jest/transform": "^29.0.0 || ^30.0.0",
+        "@jest/types": "^29.0.0 || ^30.0.0",
+        "babel-jest": "^29.0.0 || ^30.0.0",
+        "jest": "^29.0.0 || ^30.0.0",
+        "jest-util": "^29.0.0 || ^30.0.0",
+        "typescript": ">=4.3 <6"
+      },
+      "peerDependenciesMeta": {
+        "@babel/core": {
+          "optional": true
+        },
+        "@jest/transform": {
+          "optional": true
+        },
+        "@jest/types": {
+          "optional": true
+        },
+        "babel-jest": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jest-util": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ts-jest/node_modules/semver": {
+      "version": "7.7.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
+      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/ts-jest/node_modules/type-fest": {
+      "version": "4.41.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz",
+      "integrity": "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA==",
+      "dev": true,
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/ts-node": {
       "version": "10.9.2",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
diff --git a/package.json b/package.json
index f9371ee..00e6f25 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,16 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "jest"
+    "test": "jest",
+    "test:coverage": "jest --coverage" 
+  },
+  "jest": {
+    "preset": "ts-jest",
+    "testEnvironment": "node"
+    
+  },
+  "compilerOptions": {
+    "esModuleInterop": true
   },
   "repository": {
     "type": "git",
@@ -22,7 +31,9 @@
   "devDependencies": {
     "@types/jest": "^30.0.0",
     "jest": "^30.0.4",
+    "ts-jest": "^29.4.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.8.3"
   }
+  
 }
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..5c2b3a4
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules"]
+}