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package kotlinx.serialization.json
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlin.test.*
class JsonElementDecodingTest : JsonTestBase() {
@Serializable
data class A(val a: Int = 42)
@Test
fun testTopLevelClass() = assertSerializedForm(A(), """{}""".trimMargin())
@Test
fun testTopLevelNullableClass() {
assertSerializedForm<A?>(A(), """{}""")
assertSerializedForm<A?>(null, "null")
}
@Test
fun testTopLevelPrimitive() = assertSerializedForm(42, """42""")
@Test
fun testTopLevelNullablePrimitive() {
assertSerializedForm<Int?>(42, """42""")
assertSerializedForm<Int?>(null, """null""")
}
@Test
fun testTopLevelList() = assertSerializedForm(listOf(42), """[42]""")
@Test
fun testTopLevelNullableList() {
assertSerializedForm<List<Int>?>(listOf(42), """[42]""")
assertSerializedForm<List<Int>?>(null, """null""")
}
private inline fun <reified T> assertSerializedForm(value: T, expectedString: String) {
val element = Json.encodeToJsonElement(value)
assertEquals(expectedString, element.toString())
assertEquals(value, Json.decodeFromJsonElement(element))
}
@Test
fun testDeepRecursion() {
// Reported as https://github.com/Kotlin/kotlinx.serialization/issues/1594
var json = """{ "a": %}"""
for (i in 0..12) {
json = json.replace("%", json)
}
json = json.replace("%", "0")
Json.parseToJsonElement(json)
}
private open class NullAsElementSerializer<T : Any>(private val serializer: KSerializer<T>, val nullElement: T) : KSerializer<T?> {
final override val descriptor: SerialDescriptor = serializer.descriptor.nullable
final override fun serialize(encoder: Encoder, value: T?) {
serializer.serialize(encoder, value ?: nullElement)
}
final override fun deserialize(decoder: Decoder): T = serializer.deserialize(decoder)
}
private object NullAsJsonNullJsonElementSerializer : NullAsElementSerializer<JsonElement>(JsonElement.serializer(), JsonNull)
private object NullAsJsonNullJsonPrimitiveSerializer : NullAsElementSerializer<JsonPrimitive>(JsonPrimitive.serializer(), JsonNull)
private object NullAsJsonNullJsonNullSerializer : NullAsElementSerializer<JsonNull>(JsonNull.serializer(), JsonNull)
private val noExplicitNullsOrDefaultsJson = Json {
explicitNulls = false
encodeDefaults = false
}
@Test
fun testNullableJsonElementDecoding() {
@Serializable
data class Wrapper(
@Serializable(NullAsJsonNullJsonElementSerializer::class)
val value: JsonElement? = null,
)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = JsonNull), """{"value":null}""", noExplicitNullsOrDefaultsJson)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = null), """{}""", noExplicitNullsOrDefaultsJson)
}
@Test
fun testNullableJsonPrimitiveDecoding() {
@Serializable
data class Wrapper(
@Serializable(NullAsJsonNullJsonPrimitiveSerializer::class)
val value: JsonPrimitive? = null,
)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = JsonNull), """{"value":null}""", noExplicitNullsOrDefaultsJson)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = null), """{}""", noExplicitNullsOrDefaultsJson)
}
@Test
fun testNullableJsonNullDecoding() {
@Serializable
data class Wrapper(
@Serializable(NullAsJsonNullJsonNullSerializer::class)
val value: JsonNull? = null,
)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = JsonNull), """{"value":null}""", noExplicitNullsOrDefaultsJson)
assertJsonFormAndRestored(Wrapper.serializer(), Wrapper(value = null), """{}""", noExplicitNullsOrDefaultsJson)
}
}
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