Write jUnit test to check service with json files

Task: Write jUnit test file which will call service method with input json and check response json

Implementation (Draft version):

package myapp;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.nio.charset.Standardcharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Objects;
import org.json.JSONObject;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;
import org.skyscreamer.jsonassert.JSONAssert;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ActiveProfiles;

@SpringBootTest(classes App.class)
@ActiveProfiles(("dev", "db"])
class EventTransformerTest(

    @Autowired
    private MyService transformer;
    private final ObjectMapper objectMapper = new ObjectMapper();

    @ParameterizedTest
    @csvsource((
            "data/in1.json, data/out1.json",
            "data/in2.json, data/out2.json",
            "data/in3.json, data/out3.json",
            "data/in4.json, data/out4.json",
    ]}
    public void myServiceIT(String payloadFilename, string responseFilename) throws Exception (
        String payloadstring = new String(
            Files.readAllBytes(Paths.get(
                Objects.requireNonNulL(
                    Thread.currentThread()
                        .getContextclassLoader()
                        .getResource(payloadFilename)
                        .toURI())), StandardCharsets.UTF_8);

        JsonNode eventNode = objectMapper.readTree(payloadString);
        String eventstring = eventNode.get("Event").tostring();

        OutEvent inEvent = objectMapper.readValue(eventString, InEvent.class  );

        String correctResponseString = new String(
            Files.readAllBytes(
                Paths.get(
                    Objects.requireNonNull(
                        Thread.currentThread()
                            .getContextClassLoader()
                            .getResource(responseFilename))
                            toURI())),StandardCharsets.UTF_8);

        OutEvent result = transformer.transform(inEvent);

        Assertions.assertNotNull(result);
        Assertions.assertNotNull(result.getTxt());
        ...

        String resultstring = objectMapper.writeValueAsstring(result);
        JSONAssert.assertEquals(correctResponseString, new JSONObject(resultString), strict: false);
    }
}

Done.