duplicate tool service and testCases, then updated index file

src/pages/list/duplicate/duplicate.service.test.ts

@@ -0,0 +1,62 @@
+import { expect, describe, it } from 'vitest';
+import { duplicateList } from './service';
+
+describe('duplicateList function', () => {
+    it('should duplicate elements correctly with symbol split', () => {
+        const input = "Hello World";
+        const result = duplicateList('symbol', ' ', ' ', input, true, false, 2);
+        expect(result).toBe("Hello World Hello World");
+    });
+
+    it('should duplicate elements correctly with regex split', () => {
+        const input = "Hello||World";
+        const result = duplicateList('regex', '\\|\\|', ' ', input, true, false, 2);
+        expect(result).toBe("Hello World Hello World");
+    });
+
+    it('should handle fractional duplication', () => {
+        const input = "Hello World";
+        const result = duplicateList('symbol', ' ', ' ', input, true, false, 1.5);
+        expect(result).toBe("Hello World Hello");
+    });
+
+    it('should handle reverse option correctly', () => {
+        const input = "Hello World";
+        const result = duplicateList('symbol', ' ', ' ', input, true, true, 2);
+        expect(result).toBe("Hello World World Hello");
+    });
+
+    it('should handle concatenate option correctly', () => {
+        const input = "Hello World";
+        const result = duplicateList('symbol', ' ', ' ', input, false, false, 2);
+        expect(result).toBe("Hello Hello World World");
+    });
+
+    it('should handle interweaving option correctly', () => {
+        const input = "Hello World";
+        const result = duplicateList('symbol', ' ', ' ', input, false, false, 2);
+        expect(result).toBe("Hello Hello World World");
+    });
+
+    it('should throw an error for negative copies', () => {
+        expect(() => duplicateList('symbol', ' ', ' ', "Hello World", true, false, -1)).toThrow("Number of copies cannot be negative");
+    });
+
+    it('should handle interweaving option correctly 2', () => {
+        const input = "je m'appelle king";
+        const result = duplicateList('symbol', ' ', ', ', input, false, true, 2.1);
+        expect(result).toBe("je, king, m'appelle, m'appelle, king, je");
+    });
+
+    it('should handle interweaving option correctly 3', () => {
+        const input = "je m'appelle king";
+        const result = duplicateList('symbol', ' ', ', ', input, false, true, 1);
+        expect(result).toBe("je, m'appelle, king");
+    });
+
+    it('should handle interweaving option correctly 3', () => {
+        const input = "je m'appelle king";
+        const result = duplicateList('symbol', ' ', ', ', input, true, true, 2.7);
+        expect(result).toBe("je, m'appelle, king, king, m'appelle, je, king, m'appelle");
+    });
+});