pass JSONCompareMode to JSONAssert when testing with WebTestClient

ExampleTest.kt

@RunWith(SpringRunner::class)
@SpringBootTest
@AutoConfigureWebTestClient
class ExampleTests {
    @Autowired
    private lateinit var client: WebTestClient

    @Test
    fun test_of_get() {
        client.get().uri("/api/todo")
                .exchange()
                .expectStatus().isOk
                .expectBody()
                .jsonInStrict("""
                {
                  "id": 1,
                  "description": "write webflux blog"
                }
                """.trimIndent())
    }
}

JsonVerifier.kt

import org.skyscreamer.jsonassert.JSONAssert
import org.skyscreamer.jsonassert.JSONCompareMode
import org.springframework.test.web.reactive.server.EntityExchangeResult
import org.springframework.test.web.reactive.server.WebTestClient
import java.nio.charset.StandardCharsets.UTF_8
import java.util.function.Consumer

class JsonVerifier(
        private val json: String,
        private val mode: JSONCompareMode
) : Consumer<EntityExchangeResult<ByteArray>> {

    override fun accept(result: EntityExchangeResult<ByteArray>) {
        try {
            JSONAssert.assertEquals(json, getBodyAsString(result), mode)
        } catch (ex: Exception) {
            throw AssertionError("JSON parsing error", ex)
        }
    }

    private fun getBodyAsString(result: EntityExchangeResult<ByteArray>): String {
        val body = result.responseBody
        if (body == null || body.isEmpty()) {
            return ""
        }
        val mediaType = result.responseHeaders.contentType
        val charset = mediaType?.charset ?: UTF_8
        return String(body, charset)
    }
}

fun WebTestClient.BodyContentSpec.jsonInStrict(json: String) = consumeWith(JsonVerifier(json, JSONCompareMode.STRICT))