test: restore compatibility with upstream test changes

- fix addEventListener spy usage in trash tests
- add ErrorHandler mocks for IntervalsBlocks tests
- update canvas and DOM test mocks after rebase
- resolve test failures introduced during conflict resolution

Author: mahesh-09-12

js/__tests__/IntervalsBlocks.test.js

@@ -103,6 +103,11 @@ global.Singer = {
     }
 };
 
+global.ErrorHandler = {
+    warn: jest.fn(),
+    error: jest.fn()
+};
+
 const { setupIntervalsBlocks } = require("../blocks/IntervalsBlocks.js");
 
 function makeTurSinger(overrides = {}) {

js/__tests__/trash.test.js

@@ -112,7 +112,9 @@ describe("Trashcan Class", () => {
     });
 
     it("should resize and debounce the event listener", () => {
-        jest.spyOn(window, "addEventListener").mockImplementation(() => {});
+        const addEventListenerSpy = jest
+            .spyOn(window, "addEventListener")
+            .mockImplementation(() => {});
         trashcan.resizeEvent(1);
         const resizeFn = addEventListenerSpy.mock.calls[0][1];
         resizeFn(); // simulate resize

js/blocks/__tests__/IntervalsBlocks.test.js

@@ -22,6 +22,11 @@
 
 const { setupIntervalsBlocks } = require("../IntervalsBlocks");
 
+global.ErrorHandler = {
+    warn: jest.fn(),
+    error: jest.fn()
+};
+
 describe("setupIntervalsBlocks", () => {
     let activity;
     let logo;

test/setupTests.js

@@ -3,5 +3,20 @@ afterEach(() => {
     jest.restoreAllMocks();
 });
 
+HTMLCanvasElement.prototype.getContext = jest.fn(() => ({
+    rect: jest.fn(),
+    getImageData: jest.fn(() => ({ data: [] })),
+    putImageData: jest.fn(),
+    beginPath: jest.fn(),
+    moveTo: jest.fn(),
+    lineTo: jest.fn(),
+    stroke: jest.fn(),
+    closePath: jest.fn(),
+    arc: jest.fn(),
+    fill: jest.fn(),
+    clearRect: jest.fn(),
+    canvas: { width: 800, height: 600 }
+}));
+
 // Minimal globals (ONLY safe defaults)
 global.requestAnimationFrame = cb => setTimeout(cb, 0);