这是indexloc提供的服务，不要输入任何密码
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Nov 5, 2025
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BAEL-9222 #18905

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59 changes: 59 additions & 0 deletions json-modules/json-3/src/test/java/com/baeldung/jsonexception/JsonParsingUnitTest.java
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package com.baeldung.jsonexception;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.junit.jupiter.api.Test;

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

class JsonParsingUnitTest {

@Test
void givenArrayString_whenParsedAsObject_thenThrowException() {
String jsonArray = "[{\"id\":1, \"name\":\"Alice\"}]";
assertThrows(JSONException.class, () -> new JSONObject(jsonArray));
}

@Test
void givenArrayString_whenParsedAsArray_thenSuccess() {
String jsonArray = "[{\"id\":1, \"name\":\"Alice\"}]";
JSONArray array = new JSONArray(jsonArray);
assertEquals("Alice", array.getJSONObject(0).getString("name"));
}

@Test
void givenInvalidJson_whenParsed_thenThrowException() {
String invalid = "<html>Server Error</html>";
assertThrows(JSONException.class, () -> new JSONObject(invalid));
}

@Test
void givenEmptyString_whenParsed_thenThrowException() {
String empty = "";
assertThrows(JSONException.class, () -> new JSONObject(empty));
}

@Test
void givenValidJson_whenParsed_thenReturnExpectedValue() {
String json = "{\"id\":101, \"status\":\"success\"}";
JSONObject obj = new JSONObject(json);
assertEquals(101, obj.getInt("id"));
assertEquals("success", obj.getString("status"));
}

@Test
void givenUnknownJsonType_whenValidated_thenHandledGracefully() {
String response = "[{\"id\":1}]";
Object parsed;
if (response.trim().startsWith("{")) {
parsed = new JSONObject(response);
} else if (response.trim().startsWith("[")) {
parsed = new JSONArray(response);
} else {
throw new JSONException("Invalid JSON");
}
assertInstanceOf(JSONArray.class, parsed);
}
}