convertToJson.java

package com.example.helloworld3.app.welcome;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonConverter {

    public String convertToJson(Object object) throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.writeValueAsString(object);
    }
}

abcTest.java

package com.example.helloworld3.app.welcome;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

//import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import static org.junit.Assert.*;

import org.junit.Test;

public class abcTest {

    @Test
    public void testConvertToJsonThrowsException() {
        JsonConverter jsonConverter = new JsonConverter();
        
        // Test that calling convertToJson throws JsonProcessingException
        assertThrows(JsonProcessingException.class, () -> jsonConverter.convertToJson(new Object()));
    }
}