### Question:
RadioGroupFieldProvider extends SelectorFieldProvider<RadioGroupBaseDefinition> { @Override public RadioGroupBaseDefinition getDefaultField() { return new StringRadioGroupFieldDefinition(); }  @Override Class<RadioGroupFieldType> getFieldType(); @Override String getFieldTypeName(); @Override int getPriority(); @Override RadioGroupBaseDefinition getDefaultField(); @Override RadioGroupBaseDefinition createFieldByType(TypeInfo typeInfo);  }### Answer:
@Test public void testGetDefaultField() { RadioGroupBaseDefinition fieldDef = provider.getDefaultField(); assertEquals(StringRadioGroupFieldDefinition.class, fieldDef.getClass()); }