feat: Add unit tests for backend validators and configure Jest.

Backend/tests/unit/validators/CoursesInstructor.validator.test.ts

@@ -0,0 +1,150 @@
+import {
+    CreateCourseValidator,
+    UpdateCourseValidator,
+    CloneCourseValidator,
+    addInstructorCourseValidator,
+} from '@/validators/CoursesInstructor.validator';
+
+// ============================================================
+// addInstructorCourseValidator
+// ============================================================
+
+describe('addInstructorCourseValidator', () => {
+    it('should pass with valid user_id and course_id', () => {
+        const { error } = addInstructorCourseValidator.validate({
+            user_id: 1,
+            course_id: 2,
+        });
+        expect(error).toBeUndefined();
+    });
+
+    it('should fail without user_id', () => {
+        const { error } = addInstructorCourseValidator.validate({ course_id: 2 });
+        expect(error).toBeDefined();
+    });
+
+    it('should fail without course_id', () => {
+        const { error } = addInstructorCourseValidator.validate({ user_id: 1 });
+        expect(error).toBeDefined();
+    });
+});
+
+// ============================================================
+// CreateCourseValidator
+// ============================================================
+
+describe('CreateCourseValidator', () => {
+    const validPayload = {
+        category_id: 1,
+        title: { th: 'คอร์สทดสอบ', en: 'Test Course' },
+        slug: 'test-course',
+        description: { th: 'คำอธิบาย', en: 'Description' },
+        price: 500,
+        is_free: false,
+        have_certificate: true,
+    };
+
+    it('should pass with all required fields', () => {
+        const { error } = CreateCourseValidator.validate(validPayload);
+        expect(error).toBeUndefined();
+    });
+
+    it('should fail if title.th is missing', () => {
+        const { error } = CreateCourseValidator.validate({
+            ...validPayload,
+            title: { en: 'Test Course' },
+        });
+        expect(error).toBeDefined();
+    });
+
+    it('should fail if slug is missing', () => {
+        const { error } = CreateCourseValidator.validate({
+            ...validPayload,
+            slug: undefined,
+        });
+        expect(error).toBeDefined();
+    });
+
+    it('should fail if price is missing', () => {
+        const { error } = CreateCourseValidator.validate({
+            ...validPayload,
+            price: undefined,
+        });
+        expect(error).toBeDefined();
+    });
+
+    it('should fail if is_free is missing', () => {
+        const { error } = CreateCourseValidator.validate({
+            ...validPayload,
+            is_free: undefined,
+        });
+        expect(error).toBeDefined();
+    });
+
+    it('should allow price = 0 (free course)', () => {
+        const { error } = CreateCourseValidator.validate({
+            ...validPayload,
+            price: 0,
+            is_free: true,
+        });
+        expect(error).toBeUndefined();
+    });
+});
+
+// ============================================================
+// UpdateCourseValidator
+// ============================================================
+
+describe('UpdateCourseValidator', () => {
+    it('should pass with empty object (all optional)', () => {
+        const { error } = UpdateCourseValidator.validate({});
+        expect(error).toBeUndefined();
+    });
+
+    it('should pass with partial update', () => {
+        const { error } = UpdateCourseValidator.validate({ price: 999 });
+        expect(error).toBeUndefined();
+    });
+
+    it('should pass with title partial update (th only)', () => {
+        const { error } = UpdateCourseValidator.validate({
+            title: { th: 'ชื่อใหม่' },
+        });
+        expect(error).toBeUndefined();
+    });
+});
+
+// ============================================================
+// CloneCourseValidator
+// ============================================================
+
+describe('CloneCourseValidator', () => {
+    it('should pass with valid title', () => {
+        const { error } = CloneCourseValidator.validate({
+            title: { th: 'คอร์ส Copy', en: 'Course Copy' },
+        });
+        expect(error).toBeUndefined();
+    });
+
+    it('should fail without title.th', () => {
+        const { error } = CloneCourseValidator.validate({
+            title: { en: 'Course Copy' },
+        });
+        expect(error).toBeDefined();
+        expect(error?.details[0].message).toMatch(/Thai title is required/i);
+    });
+
+    it('should fail without title.en', () => {
+        const { error } = CloneCourseValidator.validate({
+            title: { th: 'คอร์ส Copy' },
+        });
+        expect(error).toBeDefined();
+        expect(error?.details[0].message).toMatch(/English title is required/i);
+    });
+
+    it('should fail without title entirely', () => {
+        const { error } = CloneCourseValidator.validate({});
+        expect(error).toBeDefined();
+        expect(error?.details[0].message).toMatch(/Title is required/i);
+    });
+});