chore: add ESLint, Prettier and Jest configuration

server/__tests__/validators.test.js

@@ -0,0 +1,55 @@
+const {
+  isNonEmptyString,
+  isValidMonth,
+  isValidDateTime,
+  validateRecordPayload,
+} = require('../utils/validators');
+
+describe('Validators', () => {
+  describe('isNonEmptyString', () => {
+    test('returns true for non-empty string', () => {
+      expect(isNonEmptyString('hello')).toBe(true);
+    });
+
+    test('returns false for empty string', () => {
+      expect(isNonEmptyString('')).toBe(false);
+    });
+
+    test('returns false for non-string', () => {
+      expect(isNonEmptyString(123)).toBe(false);
+      expect(isNonEmptyString(null)).toBe(false);
+    });
+  });
+
+  describe('isValidMonth', () => {
+    test('returns true for valid month format', () => {
+      expect(isValidMonth('2024-01')).toBe(true);
+    });
+
+    test('returns false for invalid month format', () => {
+      expect(isValidMonth('2024-1')).toBe(false);
+    });
+  });
+
+  describe('validateRecordPayload', () => {
+    test('returns null for valid payload', () => {
+      const payload = {
+        type: 'expense',
+        amount: 100,
+        category: '餐饮',
+        date: '2024-01-15',
+      };
+      expect(validateRecordPayload(payload)).toBeNull();
+    });
+
+    test('returns error for invalid type', () => {
+      const payload = {
+        type: 'invalid',
+        amount: 100,
+        category: '餐饮',
+        date: '2024-01-15',
+      };
+      expect(validateRecordPayload(payload)).toBe('账目类型错误');
+    });
+  });
+});