package org.pojomatic.test;
   
   import org.pojomatic.Pojomatic;
   import org.pojomatic.annotations.AutoProperty;
   
   /**
    * Class where every instance is equal via {@link Pojomatic#equals(Object, Object)}, but never
    * by {@code this.equals(other)}.
    */
  @AutoProperty
  public class OnlyPojomaticEqual {
    @SuppressWarnings("unused")
    private final int number = 3;
  
    @Override
    public boolean equals(Object obj) {
      //cannot assert because only the unit under test should throw AssertionError
      if (!Pojomatic.equals(this, obj)) {
        throw new IllegalStateException("Invariant violated");
      }
      return false;
    }
  
    @Override
    public String toString() {
      return "toString";
    }
  }