Hamcrest: Hello World Application

In this post, I am going to show, how to test model class employee.

Requirements

1. Employee should have fields id of type int, firstName of type String and lastName of type String

2. Model class always stores the firstName and lastName in capital letters

        

TestCase

Define Employee object and make sure id, firstName and lastName set correctly.

        

'org.hamcrest.MatcherAssert.assertThat' method is used to test given value against a matcher.

For example,

assertThat("Employee id should be equal to 1", emp.getId(), equalTo(1));

Above statement pass the test case, if getId() of emp returns 1, else fail the test case. 

First argument of assertThat method gives you the reason in failed test scenarios.

Find the below working application.

Employee.java

package com.sample.model;

public class Employee {
 private int id;
 private String firstName;
 private String lastName;
 
 public Employee(int id, String firstName, String lastName){
  this.id = id;
  this.firstName = firstName.toUpperCase();
  this.lastName = lastName.toUpperCase();
 }

 public int getId() {
  return id;
 }

 public String getFirstName() {
  return firstName;
 }

 public String getLastName() {
  return lastName;
 }

}

EmployeeTest.java

package com.sample.model;

import org.junit.Test;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;

public class EmployeeTest {

 @Test
 public void employeeConstructor_properInput_firstNameAndLastNameInUpper() {
  Employee emp = new Employee(1, "Chamu", "Majety");

  assertThat("Employee id should be equal to 1", emp.getId(), equalTo(1));
  assertThat("Employee firstName should be equal to CHAMU", emp.getFirstName(), equalTo("CHAMU"));
  assertThat("Employee lastName should be equal to MAJETY", emp.getLastName(), equalTo("MAJETY"));

 }
}

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