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/*
* Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization.json
import kotlinx.serialization.*
import kotlinx.serialization.json.internal.*
import kotlinx.serialization.modules.EmptySerializersModule
import kotlinx.serialization.modules.SerializersModule
import kotlinx.serialization.test.*
import kotlin.test.assertEquals
enum class JsonTestingMode {
STREAMING,
TREE,
JAVA_STREAMS;
companion object {
fun value(i: Int) = values()[i]
}
}
abstract class JsonTestBase {
protected val default = Json { encodeDefaults = true }
protected val lenient = Json { isLenient = true; ignoreUnknownKeys = true; allowSpecialFloatingPointValues = true }
internal inline fun <reified T : Any> Json.encodeToString(value: T, jsonTestingMode: JsonTestingMode): String {
val serializer = serializersModule.serializer<T>()
return encodeToString(serializer, value, jsonTestingMode)
}
internal fun <T> Json.encodeToString(
serializer: SerializationStrategy<T>,
value: T,
jsonTestingMode: JsonTestingMode
): String =
when (jsonTestingMode) {
JsonTestingMode.STREAMING -> {
encodeToString(serializer, value)
}
JsonTestingMode.JAVA_STREAMS -> {
encodeViaStream(serializer, value)
}
JsonTestingMode.TREE -> {
val tree = writeJson(value, serializer)
encodeToString(tree)
}
}
internal inline fun <reified T : Any> Json.decodeFromString(source: String, jsonTestingMode: JsonTestingMode): T {
val deserializer = serializersModule.serializer<T>()
return decodeFromString(deserializer, source, jsonTestingMode)
}
internal fun <T> Json.decodeFromString(
deserializer: DeserializationStrategy<T>,
source: String,
jsonTestingMode: JsonTestingMode
): T =
when (jsonTestingMode) {
JsonTestingMode.STREAMING -> {
decodeFromString(deserializer, source)
}
JsonTestingMode.JAVA_STREAMS -> {
decodeViaStream(deserializer, source)
}
JsonTestingMode.TREE -> {
val lexer = StringJsonLexer(source)
val input = StreamingJsonDecoder(this, WriteMode.OBJ, lexer, deserializer.descriptor)
val tree = input.decodeJsonElement()
lexer.expectEof()
readJson(tree, deserializer)
}
}
protected open fun parametrizedTest(test: (JsonTestingMode) -> Unit) {
processResults(buildList {
add(runCatching { test(JsonTestingMode.STREAMING) })
add(runCatching { test(JsonTestingMode.TREE) })
if (isJvm()) {
add(runCatching { test(JsonTestingMode.JAVA_STREAMS) })
}
})
}
private inner class SwitchableJson(
val json: Json,
val jsonTestingMode: JsonTestingMode,
override val serializersModule: SerializersModule = EmptySerializersModule
) : StringFormat {
override fun <T> encodeToString(serializer: SerializationStrategy<T>, value: T): String {
return json.encodeToString(serializer, value, jsonTestingMode)
}
override fun <T> decodeFromString(deserializer: DeserializationStrategy<T>, string: String): T {
return json.decodeFromString(deserializer, string, jsonTestingMode)
}
}
protected fun parametrizedTest(json: Json, test: StringFormat.() -> Unit) {
val streamingResult = runCatching { SwitchableJson(json, JsonTestingMode.STREAMING).test() }
val treeResult = runCatching { SwitchableJson(json, JsonTestingMode.TREE).test() }
processResults(listOf(streamingResult, treeResult))
}
protected fun processResults(results: List<Result<*>>) {
results.forEachIndexed { i, result ->
result.onFailure {
println("Failed test for ${JsonTestingMode.value(i)}")
throw it
}
}
for (i in results.indices) {
for (j in results.indices) {
if (i == j) continue
assertEquals(
results[i].getOrNull()!!,
results[j].getOrNull()!!,
"Results differ for ${JsonTestingMode.value(i)} and ${JsonTestingMode.value(j)}"
)
}
}
}
/**
* Same as [assertStringFormAndRestored], but tests both json converters (streaming and tree)
* via [parametrizedTest]
*/
internal fun <T> assertJsonFormAndRestored(
serializer: KSerializer<T>,
data: T,
expected: String,
json: Json = default
) {
parametrizedTest { jsonTestingMode ->
val serialized = json.encodeToString(serializer, data, jsonTestingMode)
assertEquals(expected, serialized, "Failed with streaming = $jsonTestingMode")
val deserialized: T = json.decodeFromString(serializer, serialized, jsonTestingMode)
assertEquals(data, deserialized, "Failed with streaming = $jsonTestingMode")
}
}
}
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