test(Tasks): add test suite for multi-select-utils

frontend/src/components/HomeComponents/Tasks/__tests__/multi-select-utils.test.ts

@@ -0,0 +1,96 @@
+import {
+  getFilteredItems,
+  shouldShowCreateOption,
+} from '../multi-select-utils';
+
+describe('getFilteredItems', () => {
+  it('should return items matching the search term', () => {
+    const result = getFilteredItems(['apple', 'banana', 'apricot'], [], 'ap');
+    expect(result).toEqual(['apple', 'apricot']);
+  });
+
+  it('should perform case insensitive matching', () => {
+    const result = getFilteredItems(['Apple', 'BANANA', 'apricot'], [], 'ap');
+    expect(result).toEqual(['Apple', 'apricot']);
+  });
+
+  it('should exclude already selected items', () => {
+    const result = getFilteredItems(
+      ['apple', 'banana', 'apricot'],
+      ['apple'],
+      'ap'
+    );
+    expect(result).toEqual(['apricot']);
+  });
+
+  it('should return an empty array when no items match', () => {
+    const result = getFilteredItems(['apple', 'banana'], [], 'xyz');
+    expect(result).toEqual([]);
+  });
+
+  it('should return an empty array when all matching items are selected', () => {
+    const result = getFilteredItems(
+      ['apple', 'apricot'],
+      ['apple', 'apricot'],
+      'ap'
+    );
+    expect(result).toEqual([]);
+  });
+
+  it('should return all unselected items when search term is empty', () => {
+    const result = getFilteredItems(['apple', 'banana'], ['banana'], '');
+    expect(result).toEqual(['apple']);
+  });
+
+  it('should return an empty array when availableItems is empty', () => {
+    const result = getFilteredItems([], [], 'ap');
+    expect(result).toEqual([]);
+  });
+
+  it('should return all items when selectedItems is empty and search term is empty', () => {
+    const result = getFilteredItems(['apple', 'banana'], [], '');
+    expect(result).toEqual(['apple', 'banana']);
+  });
+});
+
+describe('shouldShowCreateOption', () => {
+  it('should return true when the search term is not in either of the lists', () => {
+    const result = shouldShowCreateOption('cherry', ['apple', 'banana'], []);
+    expect(result).toBe(true);
+  });
+
+  it('should return false if the search term exists in availableItems', () => {
+    const result = shouldShowCreateOption('apple', ['apple', 'banana'], []);
+    expect(result).toBe(false);
+  });
+
+  it('should return false when search term exists in selectedItems', () => {
+    const result = shouldShowCreateOption('apple', [], ['apple']);
+    expect(result).toBe(false);
+  });
+
+  it('should return false when the search term is already empty', () => {
+    const result = shouldShowCreateOption('', ['apple'], []);
+    expect(result).toBe(false);
+  });
+
+  it('should return false when the search term is only whitespace', () => {
+    const result = shouldShowCreateOption('   ', ['apple'], []);
+    expect(result).toBe(false);
+  });
+
+  it('should trim whitespace before comparing', () => {
+    const result = shouldShowCreateOption('  cherry  ', ['apple'], []);
+    expect(result).toBe(true);
+  });
+
+  it('should return false when the trimmed search term matches an available item', () => {
+    const result = shouldShowCreateOption('  apple  ', ['apple'], []);
+    expect(result).toBe(false);
+  });
+
+  it('should return true when both the lists are empty and search term is provided', () => {
+    const result = shouldShowCreateOption('newItem', [], []);
+    expect(result).toBe(true);
+  });
+});