diff --git a/lab1/main_test.js b/lab1/main_test.js
index 74a716b4..2e8b75f5 100644
--- a/lab1/main_test.js
+++ b/lab1/main_test.js
@@ -1,23 +1,46 @@
-const test = require('node:test');
-const assert = require('assert');
-const { MyClass, Student } = require('./main');
-
-test("Test MyClass's addStudent", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
-
-test("Test MyClass's getStudentById", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
-
-test("Test Student's setName", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
-
-test("Test Student's getName", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
\ No newline at end of file
+const test = require('node:test');
+const assert = require('assert');
+const { MyClass, Student } = require('./main');
+
+test("Test MyClass's addStudent", () => {
+	const mc = new MyClass();
+	const st = new Student();
+	assert.strictEqual(mc.addStudent(mc), -1); // not Student class
+	assert.strictEqual(mc.addStudent(st), 0); // 1 students
+	assert.strictEqual(mc.addStudent(st), 1); // 2 students
+});
+
+test("Test MyClass's getStudentById", () => {
+	const mc = new MyClass();
+	
+	const st1 = new Student();
+	st1.setName("st1");
+	const st2 = new Student();
+	st2.setName("st2");
+	mc.addStudent(st1);
+	mc.addStudent(st2);
+	
+	assert.strictEqual(mc.getStudentById(-1), null); // id < 0
+	assert.strictEqual(mc.getStudentById(2), null); // id >= length
+	assert.strictEqual(mc.getStudentById(0), st1); // st1
+	assert.strictEqual(mc.getStudentById(1), st2); // st2
+});
+
+test("Test Student's setName", () => {
+	const st1 = new Student();
+	st1.setName("st1");
+	const st2 = new Student();
+	st2.setName(1);
+	
+	assert.strictEqual(st1.name, "st1"); // st1
+	assert.strictEqual(st2.name, undefined); // st2 not a string
+});
+
+test("Test Student's getName", () => {
+	const st1 = new Student();
+	st1.setName("st1");
+	const st2 = new Student();
+	
+	assert.strictEqual(st1.getName(), "st1"); // st1
+	assert.strictEqual(st2.getName(), ''); // st2
+});