Added helpers tests

src/__tests__/helpers/generateListURL.test.ts

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+import jwt from 'jsonwebtoken';
+import { config } from '../../configuration/config';
+import shareList from '../../helpers/generateListURL';
+
+jest.mock('jsonwebtoken');
+
+describe('generateListURL', () => {
+  const mockToken = 'mockToken';
+  const mockUrl = 'http://localhost:3000/lists/mockToken';
+  const mockListId = 1;
+
+  beforeAll(() => {
+    (jwt.sign as jest.Mock).mockReturnValue(mockToken);
+  });
+
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+
+  describe('shareList', () => {
+    it('should generate a shareable URL for a given list ID', () => {
+      const result = shareList(mockListId);
+
+      expect(jwt.sign).toHaveBeenCalledWith(String(mockListId), config.jwtSecretKey);
+      expect(result).toBe(mockUrl);
+    });
+  });
+});

src/__tests__/helpers/setTaskPriority.test.ts

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+import setTaskPriority from '../../helpers/setTaskPriority';
+import Task from '../../types/Task.type';
+
+describe('setTaskPriority', () => {
+  it('should set task priority to 1 if t_priority is "low"', () => {
+    const task = { t_priority: 'low' };
+    setTaskPriority(task as Task);
+    expect(task.t_priority).toBe(1);
+  });
+
+  it('should set task priority to 2 if t_priority is "medium"', () => {
+    const task = { t_priority: 'medium' };
+    setTaskPriority(task as Task);
+    expect(task.t_priority).toBe(2);
+  });
+
+  it('should set task priority to 3 if t_priority is "high"', () => {
+    const task = { t_priority: 'high' };
+    setTaskPriority(task as Task);
+    expect(task.t_priority).toBe(3);
+  });
+
+  it('should throw error if t_priority is not set', () => {
+    const task = {};
+    expect(() => setTaskPriority(task as Task)).toThrowError('Invalid priority. Must be "low", "medium", or "high"');
+  });
+
+  it('should not modify task priority if t_priority is not "low", "medium", or "high"', () => {
+    const task = { t_priority: 'urgent' };
+    expect(() => setTaskPriority(task as Task)).toThrowError('Invalid priority. Must be "low", "medium", or "high"');
+  });
+});