Test suite for turtle-painter.js (#4368)

* creating test suite for turtle-painter.js

* Exporting modules for test

Author: omsuneri

js/__tests__/turtle-painter.test.js

@@ -0,0 +1,67 @@
+const Painter = require("../turtle-painter"); 
+global.WRAP = true;  
+const mockTurtle = {
+    turtles: { 
+        screenX2turtleX: jest.fn(), 
+        screenY2turtleY: jest.fn(), 
+        turtleX2screenX: jest.fn(), 
+        turtleY2screenY: jest.fn(), 
+        scale: 1 
+    },
+    activity: { refreshCanvas: jest.fn() },
+    container: { x: 0, y: 0, rotation: 0 },
+    ctx: { 
+        beginPath: jest.fn(), 
+        clearRect: jest.fn(), 
+        stroke: jest.fn(), 
+        closePath: jest.fn(), 
+        moveTo: jest.fn(), 
+        lineTo: jest.fn(), 
+        arc: jest.fn(),
+        canvas: { width: 800, height: 600 }
+    },
+    penstrokes: { image: null },
+    orientation: 0,
+    updateCache: jest.fn(),
+    blinking: jest.fn().mockReturnValue(false)
+};
+
+describe("Painter Class", () => {
+    let painter;
+
+    beforeEach(() => {
+        painter = new Painter(mockTurtle);
+    });
+
+    describe("Constructor", () => {
+        test("should initialize with default values", () => {
+            expect(painter._color).toBe(0);
+            expect(painter._stroke).toBe(5);
+            expect(painter._penDown).toBe(true);
+        });
+    });
+
+    describe("Setters and Getters", () => {
+        test("should set and get color", () => {
+            painter.color = 10;
+            expect(painter.color).toBe(10);
+        });
+
+        test("should set and get stroke", () => {
+            painter.stroke = 8;
+            expect(painter.stroke).toBe(8);
+        });
+    });
+
+    describe("Actions", () => {
+        test("should move forward", () => {
+            painter.doForward(10);
+            expect(mockTurtle.activity.refreshCanvas).toHaveBeenCalled();
+        });
+
+        test("should turn right", () => {
+            painter.doRight(90);
+            expect(mockTurtle.orientation).toBe(90);
+        });
+    });
+});

js/turtle-painter.js

@@ -1473,3 +1473,7 @@ class Painter {
         this.turtle.updateCache();
     }
 }
+
+if (typeof module !== "undefined" && module.exports) {
+module.exports = Painter;
+}