TestHelper.java

import com.google.common.base.Joiner;
import com.google.common.base.Objects;
import com.google.common.collect.Lists;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.List;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertTrue;
import static junit.framework.Assert.fail;

public class TestHelper {

  public static void assertReflectiveEquals(String message, Object expected, Object actual) {
    String assertionMessage = "Classes are not equal";
    if (message != null) {
      assertionMessage = message + "; " + assertionMessage;
    }
    assertEquals(assertionMessage, expected.getClass(), actual.getClass());

    List<String> notEqualFields = Lists.newArrayList();
    for (Field field : expected.getClass().getDeclaredFields()) {
      if (Modifier.isStatic(field.getModifiers())) {
        continue;
      }
      try {
        field.setAccessible(true);
        Object expectedValue = field.get(expected);
        Object actualValue = field.get(actual);

        if (!Objects.equal(expectedValue, actualValue)) {
          notEqualFields.add(
              field.getName() + " is not equal (expected = " + field.get(expected) +
                  ", actual = " + field.get(actual) + ")");
        }
      } catch (IllegalAccessException e) {
        fail();
      }
    }

    assertTrue(Joiner.on(", ").join(notEqualFields), notEqualFields.isEmpty());
  }
}