feat: frontend unit tests

frontend/tests/utils/helpers/log.test.ts

@@ -0,0 +1,54 @@
+import { warn, error } from '../../../src/static/js/utils/helpers/log';
+
+describe('js/utils/helpers', () => {
+    describe('log', () => {
+        beforeEach(() => {
+            // Setup console mocks - replaces global console methods with jest mocks
+            globalThis.console.warn = jest.fn();
+            globalThis.console.error = jest.fn();
+
+            jest.clearAllMocks();
+        });
+
+        afterEach(() => {
+            // Restore original console methods
+            jest.restoreAllMocks();
+        });
+
+        test('Warn proxies arguments to console.warn preserving order and count', () => {
+            warn('a', 'b', 'c');
+            expect(console.warn).toHaveBeenCalledTimes(1);
+            expect(console.warn).toHaveBeenCalledWith('a', 'b', 'c');
+        });
+
+        test('Error proxies arguments to console.error preserving order and count', () => {
+            error('x', 'y');
+            expect(console.error).toHaveBeenCalledTimes(1);
+            expect(console.error).toHaveBeenCalledWith('x', 'y');
+        });
+
+        test('Warn supports zero arguments', () => {
+            warn();
+            expect(console.warn).toHaveBeenCalledTimes(1);
+            expect((console.warn as jest.Mock).mock.calls[0].length).toBe(0);
+        });
+
+        test('Error supports zero arguments', () => {
+            error();
+            expect(console.error).toHaveBeenCalledTimes(1);
+            expect((console.error as jest.Mock).mock.calls[0].length).toBe(0);
+        });
+
+        test('Warn does not call console.error and error does not call console.warn', () => {
+            warn('only-warn');
+            expect(console.warn).toHaveBeenCalledTimes(1);
+            expect(console.error).not.toHaveBeenCalled();
+
+            jest.clearAllMocks();
+
+            error('only-error');
+            expect(console.error).toHaveBeenCalledTimes(1);
+            expect(console.warn).not.toHaveBeenCalled();
+        });
+    });
+});