TypeScript Unit testing from sractch

unit_testing_from_sratch.ts

//this is test framework
class TestCase {
	protected assertEquals(a,b){
		if(a === b){
			return true;
		}else{
			throw new Error(`Equals failed: "${a}" is not equal "${b}"`);
		}
	}
}

class TestRunner {
	private testCases: Array<typeof TestCase>;
	
	constructor(){
		this.testCases = [];
	}
	
	addTestCase(testCase: typeof TestCase){
		this.testCases.push(testCase);
	}
	
	run(){
		this.testCases.forEach(testCase => {
			let testCaseInstance = new testCase();
			
			Object.getOwnPropertyNames(testCase.prototype).forEach(methodName => {
				if(/^test/.test(methodName)) {
					try{
						testCaseInstance[methodName]();
						console.log(`Test "${methodName}" [passed]`);						
					}catch(err){
						console.error(err.stack);
					}
				}
			})
		});
	}
}


//example

//testing target
class Student {
	private firstName: String;
	private lastName: String;
	
	constructor(firstName,lastName){
		this.firstName = firstName;
		this.lastName = lastName;
	}
	
	
	print(){
		return `${this.firstName}  ${this.lastName}`;
	}
}

//my test example
class StudentTest extends TestCase{
	testConstructor(){
		let s = new Student('','');
		this.assertEquals(s instanceof Student, true);
	}
	
	testPrint() {
	  let firstName = 'Tom',
	   lastName = 'Doe';
	   
	   let studentExample = new Student(firstName,lastName);
	   let printResult = studentExample.print();
	   
	   this.assertEquals(printResult,firstName + ' ' + lastName);
	}
	
	testFoo(){
		this.assertEquals(true,true);
	}
	
	
	testFoo2(){
		this.assertEquals(true,true);
	}
	
	
	testFoo3(){
		this.assertEquals(true,true);
	}
}

//run tests
let testRunner = new TestRunner();
testRunner.addTestCase(StudentTest);
testRunner.run()