Creating specific assertions

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Creating its own assertions is simple : create a class inheriting from AbstractAssert and add your custom assertions method.
To be easy to use, you should also add a static method assertThat to provide an handy entry point to your new assertion class.

Let's see how to do that on an example !

The example is taken from fest-examples and more specifically TolkienCharacterAssert.java.

The class we want to make assertion on is TolkienCharacter :

// getter/setter not shown for brievety
public class TolkienCharacter {
  private String name;
  private Race race;
  private int age;
}

A TolkienCharacter has Race, which is a simple class having only a name and an immortal attribute :

public class Race {
  private final String name;
  private final boolean immortal;
}