How Mean Bean tests getter and setter methods

In my previous post, I explained about mean bean and given you an example that tests Employee bean. In this post, I am going to explain the implementation of testBean method.

As per the documentation of mean bean, the testBean method implemented like below.

for i in 1 .. numberOfIterations do
  for each property in public getter/setter method pairs do
    generate suitable test data for property
    invoke setter with test data
    invoke getter
    test that getter returned same value as passed to setter
  end for
end for

For every iteration, ‘mean bean’ sets a public property and call the respective getter property. Test will pass, if the getter method return same value as passed to setter. The default iterations are 100.

You can set number of iterations to perform by using setIterations method.

BeanTester beanTester = new BeanTester();

beanTester.setIterations(15);

If the getter method doesn’t return the same value that is set by setter method, test will fail with proper message.

Employee.java

public class Employee {
  private String name;
  private int id;

  public String getName() {
    return name.toUpperCase();
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("Employee [name=").append(name).append(", id=")
        .append(id).append("]");
    return builder.toString();
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + id;
    result = prime * result + ((name == null) ? 0 : name.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    Employee other = (Employee) obj;
    if (id != other.id)
      return false;
    if (name == null) {
      if (other.name != null)
        return false;
    } else if (!name.equals(other.name))
      return false;
    return true;
  }

}

getName() function is implemented like below. It converts the name to uppercase and return.

public String getName() {

         return name.toUpperCase();

}

When you run testBean method on Employee class, test will fail, because getName() function don’t return the same value set by setName() method, it is returning the uppercase version of string.

import org.junit.Test;
import org.meanbean.test.BeanTester;

public class TestBean {

  @Test
  public void testEmployee() {
    BeanTester beanTester = new BeanTester();
    beanTester.testBean(Employee.class);
  }
}

Run TestBean.java, you will get following error in console.

Apr 15, 2016 6:16:15 PM org.meanbean.test.BeanPropertyTester testProperty

INFO: testProperty: Property [name] getter did not return test value. Expected [TestString:[6857449200479584740]] but getter returned [TESTSTRING:[6857449200479584740]].

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