Add Jest as dev dependency

Author: SeanChen327

code/frontend/package.json

@@ -7,7 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "jest"
   },
   "dependencies": {
     "bootstrap": "^5.3.8",

code/frontend/src/tests/Content.test.ts

@@ -0,0 +1,8 @@
+// This is just for testing if jest works correctly, you can delete it after testing.
+function sum(a, b) {
+  return a + b;
+}
+
+test('adds 1 + 2 to equal 3', () => {
+  expect(sum(1, 2)).toBe(3);
+});

code/frontend/src/tests/Login.test.ts

@@ -0,0 +1,8 @@
+// This is just for testing if jest works correctly, you can delete it after testing.
+function sum(a, b) {
+  return a + b;
+}
+
+test('adds 1 + 2 to equal 3', () => {
+  expect(sum(1, 2)).toBe(3);
+});

code/frontend/src/tests/Registration.test.ts

@@ -0,0 +1,8 @@
+// This is just for testing if jest works correctly, you can delete it after testing.
+function sum(a, b) {
+  return a + b;
+}
+
+test('adds 1 + 2 to equal 3', () => {
+  expect(sum(1, 2)).toBe(3);
+});