Provide factory function to file-saver mock

Author: limzykenneth

test/unit/image/downloading.js

@@ -6,7 +6,11 @@ import files from '../../../src/io/files';
 import loading from '../../../src/image/loading_displaying';
 import p5Image from '../../../src/image/p5.Image';
 
-vi.mock('file-saver');
+vi.mock('file-saver', () => {
+  return {
+    saveAs: vi.fn()
+  };
+});
 
 expect.extend({
   tobeGif: received => {

test/unit/io/files.js

@@ -3,7 +3,11 @@ import files from '../../../src/io/files';
 import { vi } from 'vitest';
 import * as fileSaver from 'file-saver';
 
-vi.mock('file-saver');
+vi.mock('file-saver', () => {
+  return {
+    saveAs: vi.fn()
+  };
+});
 
 suite('Files', function() {
   beforeAll(async function() {

test/unit/io/saveTable.js

@@ -5,7 +5,11 @@ import files from '../../../src/io/files';
 import table from '../../../src/io/p5.Table';
 import tableRow from '../../../src/io/p5.TableRow';
 
-vi.mock('file-saver');
+vi.mock('file-saver', () => {
+  return {
+    saveAs: vi.fn()
+  };
+});
 
 suite('saveTable', function() {
   const validFile = '/test/unit/assets/csv.csv';

test/unit/webgl/p5.Framebuffer.js

@@ -1,7 +1,11 @@
 import p5 from '../../../src/app.js';
 import { vi } from 'vitest';
 import * as fileSaver from 'file-saver';
-vi.mock('file-saver');
+vi.mock('file-saver', () => {
+  return {
+    saveAs: vi.fn()
+  };
+});
 
 expect.extend({
   tobePng: received => {