BrokenQueryParamsTest.java

package org.example.queryparamsbugs;


import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.reactive.server.WebTestClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.Map;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class BrokenQueryParamsTest {

    @Autowired
    private WebTestClient webTestClient;

    @Test
    void unindexedStringArray() {
        final var expected = new ArrayDto(
            List.of("asd"),
            null
        );
       webTestClient.get()
           .uri("/array?stringList[]=asd")
           .exchange()
           .expectStatus()
           .is2xxSuccessful()
           .expectBody(ArrayDto.class)
           .isEqualTo(expected);
    }

    @Test
    void indexedIntArray() {
        final var expected = new ArrayDto(
            List.of("asd"),
            List.of(123)
        );
        webTestClient.get()
            .uri("/array?stringList[0]=asd&intList[0]=123")
            .exchange()
            .expectStatus()
            .is2xxSuccessful()
            .expectBody(ArrayDto.class)
            .isEqualTo(expected);
    }

    @Test
    void mapWithIntValues() {
        final var expected = new MapDto(
            Map.of(
                "key1", 123
            )
        );
        webTestClient.get()
            .uri("/map?intMap[key1]=123")
            .exchange()
            .expectStatus()
            .is2xxSuccessful()
            .expectBody(MapDto.class)
            .isEqualTo(expected);
    }
}

@RestController
class TestController {

    @GetMapping("/array")
    public Mono<ArrayDto> array(ArrayDto queryParams) {
        return Mono.just(queryParams);
    }

    @GetMapping("/map")
    public Mono<MapDto> array(MapDto queryParams) {
        return Mono.just(queryParams);
    }
}

record ArrayDto(
    List<String> stringList,
    List<Integer> intList
) {}

record MapDto(
    Map<String, Integer> intMap
) {}