DESIGN LEVEL CLASS DIAGRAM WITH TEST DRIVEN DEVELOPMENT APPROACH

What is TDD?
If somebody asks me to explain TDD in few words, I say TDD is a development of tests before a feature implementation. You can argue that it’s hard to test things which are not existing yet. And Kent Beck will probably give you a slap for this.

So how is it possible? It can be described by following steps:

1. You read and understand requirements for a particular feature.
2. You develop a set of tests which check the feature. All of the tests are red, due to absence of the feature implementation.
3. You develop the feature until all tests become green.
4. Refactor the code.

Here this Java Program for Hospital Management System with JUnit in Eclipse.

AllTests.java

package SMD7;

import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;

@RunWith(Suite.class)
@SuiteClasses({ DoctorTest.class, ReceptionistTest.class })
public class AllTests {

}

Receptionist.java

package SMD7;

public class Receptionist {

 private int id =101;
 private String name = "Raju";
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 
}

ReceptionistTest.java

package SMD7;

import static org.junit.Assert.*;

import org.junit.Test;

public class ReceptionistTest {

 @Test
 public void test() {
  Receptionist R = new Receptionist();
  int id = R.getId();
  String name = R.getName();
  assertEquals(101, id);
  assertEquals("Raju", name);
 }

}

Doctor.java

package SMD7;

public class Doctor {

 private int id =201;
 private String name = "Rastogi";
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 
}

DoctorTest.java

package SMD7;

import static org.junit.Assert.*;

import org.junit.Test;

public class DoctorTest {

 @Test
 public void test() {
  Doctor R = new Doctor();
  int id = R.getId();
  String name = R.getName();
  assertEquals(201, id);
  assertEquals("Rastogi", name);
 }

}

This video might be helpful.