### Question:
BooleanField implements FieldType<Boolean> { @Override public Boolean getDefaultValue() { return defaultValue; } BooleanField();  BooleanField(final Boolean defaultValue); @Override Types getType(); @Override Boolean getDefaultValue(); @Override boolean hasDefaultValue(); @Override Boolean convert(Object objValue); @Override JSONObject toJson();  }### Answer:
@Test public void testGetDefaultValue() { System.out.println("getDefaultValue"); BooleanField instance = new BooleanField(); assertEquals(null, instance.getDefaultValue()); instance = new BooleanField(true); assertTrue(instance.getDefaultValue()); instance = new BooleanField(false); assertFalse(instance.getDefaultValue()); }