assertTrue(firstNullsSuppressed);

        boolean firstPrettyPrintSuppressed = provider.isPrettyPrintSuppressed();
        boolean secondPrettyPrintSuppressed = provider.isPrettyPrintSuppressed();
        boolean thirdPrettyPrintSuppressed = provider.isPrettyPrintSuppressed();

        assertEquals(firstPrettyPrintSuppressed, secondPrettyPrintSuppressed);

public class FessJsonResourceProvider implements JsonResourceProvider {
    @Override
    public boolean isNullsSuppressed() {
        return true;
    }

    @Override
    public boolean isPrettyPrintSuppressed() {
        return false;
    }

    @Override
    public JsonMappingOption provideMappingOption() {
        return new JsonMappingOption().asFieldNaming(JsonFieldNaming.CAMEL_TO_LOWER_SNAKE);
    }