diff --git a/lab1/main_test.js b/lab1/main_test.js
index 74a716b..a6d33a6 100644
--- a/lab1/main_test.js
+++ b/lab1/main_test.js
@@ -3,21 +3,47 @@ const assert = require('assert');
 const { MyClass, Student } = require('./main');
 
 test("Test MyClass's addStudent", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const Class = new MyClass();
+    const student = new Student();
+    const id = Class.addStudent(student);
+    assert.strictEqual(id, 0);
+    assert.strictEqual(Class.addStudent({}), -1);
 });
 
 test("Test MyClass's getStudentById", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const Class =  new MyClass();
+    const student = new Student();
+    student.setName("John");
+
+    const id = Class.addStudent(student);
+    const StudentID = Class.getStudentById(id);
+
+    assert.strictEqual(StudentID.getName(), "John");
+    assert.strictEqual(Class.getStudentById(-1), null); 
+    assert.strictEqual(Class.getStudentById(999), null);
+
 });
 
 test("Test Student's setName", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const student = new Student();
+    student.setName(123);  
+    assert.strictEqual(student.getName(), "");
+
+    student.setName("John");
+    const StudentName = student.getName();
+
+    
+    assert.strictEqual(StudentName, "John");
+    
 });
 
 test("Test Student's getName", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    const student = new Student();
+
+    // "" in default
+    assert.strictEqual(student.getName(), "");
+    
+    student.setName("John");
+    const StudentName = student.getName();
+    assert.strictEqual(StudentName, "John");
 });
\ No newline at end of file