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/removeDuplicate.spec.js

@@ -0,0 +1,38 @@
+import { removeDuplicate } from './removeDuplicate';
+
+describe('removeDuplicate', () => {
+  test('should remove duplicate elements of an array', () => {
+    const result = removeDuplicate([1, 1, 2, 3, 3, 4, 5]);
+    const expected = [1, 2, 3, 4, 5];
+    expect(result).toStrictEqual(expected);
+    expect(result.length).toBe(5);
+  });
+
+  test('should return an empty array', () => {
+    const result = removeDuplicate([]);
+    const expected = [];
+    expect(result).toStrictEqual(expected);
+    expect(result.length).toBe(0);
+  });
+
+  test('should return an array with the same element', () => {
+    const result = removeDuplicate([1]);
+    const expected = [1];
+    expect(result).toStrictEqual(expected);
+    expect(result.length).toBe(1);
+  });
+
+  test('should return an array with only one element', () => {
+    const result = removeDuplicate([1, 1, 1, 1]);
+    const expected = [1];
+    expect(result).toStrictEqual(expected);
+    expect(result.length).toBe(1);
+  });
+
+  test('should return an array with the unique elements in the same order as the original array', () => {
+    const result = removeDuplicate([1, 2, 3, 4, 5, 1, 2, 3, 4, 5]);
+    const expected = [1, 2, 3, 4, 5];
+    expect(result).toStrictEqual(expected);
+    expect(result.length).toBe(5);
+  });
+});