feat: finish test of main.js

lab1/main_test.js

@@ -1,23 +1,48 @@
-const test = require('node:test');
-const assert = require('assert');
-const { MyClass, Student } = require('./main');
+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");
+    let myClass = new MyClass();
+    // test if the type of the student is not Student
+    assert.strictEqual(myClass.addStudent("not a student"), -1);
+
+    // test if there is no student in MyClass
+    assert.strictEqual(myClass.students.length, 0);
+
+    // test if there is one student in MyClass
+    let student = new Student();
+    student.setName("John");
+    myClass.addStudent(student);
+    assert.strictEqual(myClass.students.length, 1);
 });
 
 test("Test MyClass's getStudentById", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    let myClass = new MyClass();
+    // test if the search id is not a number
+    assert.strictEqual(myClass.getStudentById("not a number"), undefined);
+
+    // test if student id is out of range
+    assert.strictEqual(myClass.getStudentById(-1), null);
+    assert.strictEqual(myClass.getStudentById(0), null);
+
+    // test if the student is found
+    let student = new Student();
+    student.setName("John");
+    myClass.addStudent(student);
+    assert.strictEqual(myClass.getStudentById(0), student);
 });
 
 test("Test Student's setName", () => {
-    // TODO
-    throw new Error("Test not implemented");
+    let student = new Student();
+    assert.strictEqual(student.setName(123), undefined);
+    student.setName("John");
+    assert.strictEqual(student.name, "John");
 });
 
 test("Test Student's getName", () => {
-    // TODO
-    throw new Error("Test not implemented");
-});
+    let student = new Student();
+    assert.strictEqual(student.getName(), "");
+    student.setName("John");
+    assert.strictEqual(student.getName(), "John");
+});