feat: unit tests for utils (#92)

* init

* get unit test working for course.ts file

* added some other tests

* tests halfway + change config to accomodate js files

* utility functions tests done

* fix: config file + miscellaneous fixes

* fix: prepare script

* fix lock file

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

apps/dashboard/src/lib/utils/functions/date.spec.ts

@@ -0,0 +1,36 @@
+import { calDateDiff, getGreeting } from './date';
+
+describe('calDateDiff', () => {
+  test('should return the correct time difference when the input date is in the past', () => {
+    const inputDate = new Date('2022-01-01');
+    const expectedOutput = '2 years ago';
+
+    const result = calDateDiff(inputDate);
+
+    expect(result).toBe(expectedOutput);
+  });
+
+  test('should return the correct time difference when the input date is a number', () => {
+    const inputDate = new Date(1640995200000); // January 1, 2022
+    const expectedOutput = '2 years ago';
+
+    const result = calDateDiff(inputDate);
+
+    expect(result).toBe(expectedOutput);
+  });
+});
+
+describe('getGreeting', () => {
+  test("should return 'Good Morning' when the current time is before 12pm", () => {
+    jest.useFakeTimers().setSystemTime(new Date('2023-12-10T00:21:01.691Z'));
+    expect(getGreeting()).toBe('Good Morning');
+  });
+  test("should return 'Good Afternoon' when the current time is after 12pm", () => {
+    jest.useFakeTimers().setSystemTime(new Date('2023-12-10T14:21:01.691Z'));
+    expect(getGreeting()).toBe('Good Afternoon');
+  });
+  test("should return 'Good Evening' when the current time is after 6pm", () => {
+    jest.useFakeTimers().setSystemTime(new Date('2023-12-10T19:21:01.691Z'));
+    expect(getGreeting()).toBe('Good Evening');
+  });
+});