diff --git a/lab0/lab0.js b/lab0/lab0.js
index e69de29..fa2ad5c 100644
--- a/lab0/lab0.js
+++ b/lab0/lab0.js
@@ -0,0 +1 @@
+console.log("Hello world!");
diff --git a/lab1/main_test.js b/lab1/main_test.js
index 74a716b..a9c842a 100644
--- a/lab1/main_test.js
+++ b/lab1/main_test.js
@@ -3,21 +3,58 @@ const assert = require('assert');
 const { MyClass, Student } = require('./main');
 
 test("Test MyClass's addStudent", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const myClass = new MyClass();
+    const student = new Student();
+    
+    // Valid student case
+    const studentId = myClass.addStudent(student);
+    assert.strictEqual(studentId, 0);
+
+    // Invalid input case
+    const invalidId = myClass.addStudent({});
+    assert.strictEqual(invalidId, -1);
 });
 
 test("Test MyClass's getStudentById", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const myClass = new MyClass();
+    const student = new Student();
+    student.setName("John");
+    
+    const studentId = myClass.addStudent(student);
+    
+    // Valid retrieval
+    const retrievedStudent = myClass.getStudentById(studentId);
+    assert.ok(retrievedStudent instanceof Student);
+    assert.strictEqual(retrievedStudent.getName(), "John");
+
+    // Invalid ID cases
+    assert.strictEqual(myClass.getStudentById(-1), null);
+    assert.strictEqual(myClass.getStudentById(101), null);
 });
 
+
 test("Test Student's setName", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const student = new Student();
+    
+    // Valid name setting
+    student.setName("Jane");
+    assert.strictEqual(student.getName(), "Jane");
+
+    // Invalid input cases
+    student.setName(123);
+    assert.strictEqual(student.getName(), "Jane");  // Should not change
+
+    student.setName(null);
+    assert.strictEqual(student.getName(), "Jane");  // Should not change
 });
 
 test("Test Student's getName", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
\ No newline at end of file
+    const student = new Student();
+    
+    // Default value case
+    assert.strictEqual(student.getName(), '');
+
+    // After setting a valid name
+    student.setName("Alice");
+    assert.strictEqual(student.getName(), "Alice");
+});