JSONAssertsで遊ぶ

import org.json.JSONException;
import org.junit.jupiter.api.Test;
import org.skyscreamer.jsonassert.JSONAssert;
import org.skyscreamer.jsonassert.CustomComparator;
import org.skyscreamer.jsonassert.JSONCompareMode;
import org.skyscreamer.jsonassert.comparator.Customization;

public class JsonComparisonTest {

    @Test
    void test_01() throws JSONException {
        // language=json
        String expect = "{ \"time\" : {\n" +
                "  \"insertTime\": \"201912010023\",\n" +
                "  \"updateTime\": \"202008111234\"\n" +
                "},\n" +
                "\"animal\": \"gorilla\"}\n";

        // language=json
        String actual = "{ \"time\" : {\n" +
                "  \"insertTime\": null,\n" +
                "  \"updateTime\": \"999999999999\"\n" +
                "},\n" +
                "\"animal\": \"gorilla\"}\n";

        JSONAssert.assertEquals(expect, actual,
                new CustomComparator(JSONCompareMode.STRICT,
                        new Customization("time.insertTime", (o1, o2) -> {
                            if (o2 == null) return true; // actualがnullの場合は無視
                            if (o1 instanceof String && o2 instanceof String) {
                                return ((String) o2).matches("201912010023"); // 正規表現で比較
                            }
                            return false;
                        }),
                        new Customization("time.updateTime", (o1, o2) -> {
                            if (o2 == null) return true; // actualがnullの場合は無視
                            if (o1 instanceof String && o2 instanceof String) {
                                return ((String) o2).matches(".*"); // 正規表現で比較
                            }
                            return false;
                        })
                )
        );
    }
}