CreatorWithNamingStrategyTest.java

package tools.jackson.databind.deser.creators;

import org.junit.jupiter.api.Test;

import com.fasterxml.jackson.annotation.JsonCreator;

import tools.jackson.databind.*;
import tools.jackson.databind.cfg.MapperConfig;
import tools.jackson.databind.introspect.AnnotatedMember;
import tools.jackson.databind.introspect.AnnotatedParameter;
import tools.jackson.databind.introspect.JacksonAnnotationIntrospector;

import static org.junit.jupiter.api.Assertions.assertEquals;

import static tools.jackson.databind.testutil.DatabindTestUtil.jsonMapperBuilder;

public class CreatorWithNamingStrategyTest
{
    @SuppressWarnings("serial")
    static class MyParamIntrospector extends JacksonAnnotationIntrospector
    {
        @Override
        public String findImplicitPropertyName(MapperConfig<?> config, AnnotatedMember param) {
            if (param instanceof AnnotatedParameter ap) {
                return "paramName"+ap.getIndex();
            }
            return super.findImplicitPropertyName(config, param);
        }
    }

    // [databind#2051]
    static class OneProperty {
        public String paramName0;

        @JsonCreator
        public OneProperty(String bogus) {
            paramName0 = "CTOR:"+bogus;
        }
    }

    /*
    /**********************************************************
    /* Test methods
    /**********************************************************
     */

    // [databind#2051]
    @Test
    public void testSnakeCaseWithOneArg() throws Exception
    {
        ObjectMapper mapper = jsonMapperBuilder()
                .propertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE)
                .annotationIntrospector(new MyParamIntrospector())
                .build();
        final String MSG = "1st";
        OneProperty actual = mapper.readValue("{\"param_name0\":\""+MSG+"\"}",
                OneProperty.class);
        assertEquals("CTOR:"+MSG, actual.paramName0);
    }
}