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/*
* Copyright 2017-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization
import kotlinx.serialization.json.*
import kotlinx.serialization.test.*
import kotlin.test.*
class JsonPathTest : JsonTestBase() {
@Serializable
class Outer(val a: Int, val i: Inner)
@Serializable
class Inner(val a: Int, val b: String, val c: List<String>, val d: Map<Int, Box>)
@Serializable
class Box(val s: String)
@Test
fun testBasicError() {
expectPath("$.a") { Json.decodeFromString<Outer>("""{"a":foo}""") }
expectPath("$.i") { Json.decodeFromString<Outer>("""{"a":42, "i":[]}""") }
expectPath("$.i.b") { Json.decodeFromString<Outer>("""{"a":42, "i":{"a":43, "b":42}""") }
expectPath("$.i.b") { Json.decodeFromString<Outer>("""{"a":42, "i":{"b":42}""") }
}
@Test
fun testMissingKey() {
expectPath("$.i.d['1']") { Json.decodeFromString<Outer>("""{"a":42, "i":{"d":{1:{}}""") }
}
@Test
fun testUnknownKeyIsProperlyReported() {
expectPath("$.i") { Json.decodeFromString<Outer>("""{"a":42, "i":{"foo":42}""") }
expectPath("$") { Json.decodeFromString<Outer>("""{"x":{}, "a": 42}""") }
// The only place we have misattribution in
// Json.decodeFromString<Outer>("""{"a":42, "x":{}}""")
}
@Test
fun testMalformedRootObject() {
expectPath("$") { Json.decodeFromString<Outer>("""{{""") }
}
@Test
fun testArrayIndex() {
expectPath("$.i.c[1]") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "c": ["a", 2]}""") }
expectPath("$[2]") { Json.decodeFromString<List<String>>("""["a", "2", 3]""") }
}
@Test
fun testArrayIndexMalformedArray() {
// Also zeroes as we cannot distinguish what exactly wen wrong is such cases
expectPath("$.i.c[0]") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "c": [[""") }
expectPath("$[0]") { Json.decodeFromString<List<String>>("""[[""") }
// But we can here
expectPath("$.i.c\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "c": {}}}""") }
expectPath("$\n") { Json.decodeFromString<List<String>>("""{""") }
}
@Test
fun testMapKey() {
expectPath("$.i.d\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "d": {"foo": {}}""") }
expectPath("$.i.d\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "d": {42: {"s":"s"}, 42.0:{}}""") }
expectPath("$\n") { Json.decodeFromString<Map<Int, String>>("""{"foo":"bar"}""") }
expectPath("$\n") { Json.decodeFromString<Map<Int, String>>("""{42:"bar", "foo":"bar"}""") }
expectPath("$['42']['foo']") { Json.decodeFromString<Map<Int, Map<String, Int>>>("""{42: {"foo":"bar"}""") }
}
@Test
fun testMalformedMap() {
expectPath("$.i.d\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "d": []""") }
expectPath("$\n") { Json.decodeFromString<Map<Int, String>>("""[]""") }
}
@Test
fun testMapValue() {
expectPath("$.i.d['42']\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "d": {42: {"xx":"bar"}}""") }
expectPath("$.i.d['43']\n") { Json.decodeFromString<Outer>("""{"a":42, "i":{ "d": {42: {"s":"s"}, 43: {"xx":"bar"}}}""") }
expectPath("$['239']") { Json.decodeFromString<Map<Int, String>>("""{239:bar}""") }
}
@Serializable
class Fp(val d: Double)
@Test
fun testInvalidFp() {
expectPath("$.d") { Json.decodeFromString<Fp>("""{"d": NaN}""") }
}
@Serializable
class EH(val e: E)
enum class E
@Test
fun testUnknownEnum() {
expectPath("$.e") { Json.decodeFromString<EH>("""{"e": "foo"}""") }
}
@Serializable
@SerialName("f")
sealed class Sealed {
@Serializable
@SerialName("n")
class Nesting(val f: Sealed) : Sealed()
@Serializable
@SerialName("b")
class Box(val s: String) : Sealed()
@Serializable
@SerialName("d")
class DoubleNesting(val f: Sealed, val f2: Sealed) : Sealed()
}
// TODO use non-array polymorphism when https://github.com/Kotlin/kotlinx.serialization/issues/1839 is fixed
@Test
fun testHugeNestingToCheckResize() = jvmOnly {
val json = Json { useArrayPolymorphism = true }
var outer = Sealed.Nesting(Sealed.Box("value"))
repeat(100) {
outer = Sealed.Nesting(outer)
}
val str = json.encodeToString(Sealed.serializer(), outer)
// throw-away data
json.decodeFromString(Sealed.serializer(), str)
val malformed = str.replace("\"value\"", "42")
val expectedPath = "$" + ".value.f".repeat(101) + ".value.s"
expectPath(expectedPath) { json.decodeFromString(Sealed.serializer(), malformed) }
}
@Test
fun testDoubleNesting() = jvmOnly {
val json = Json { useArrayPolymorphism = true }
var outer1 = Sealed.Nesting(Sealed.Box("correct"))
repeat(64) {
outer1 = Sealed.Nesting(outer1)
}
var outer2 = Sealed.Nesting(Sealed.Box("incorrect"))
repeat(33) {
outer2 = Sealed.Nesting(outer2)
}
val str = json.encodeToString(Sealed.serializer(), Sealed.DoubleNesting(outer1, outer2))
// throw-away data
json.decodeFromString(Sealed.serializer(), str)
val malformed = str.replace("\"incorrect\"", "42")
val expectedPath = "$.value.f2" + ".value.f".repeat(34) + ".value.s"
expectPath(expectedPath) { json.decodeFromString(Sealed.serializer(), malformed) }
}
private inline fun expectPath(path: String, block: () -> Unit) {
val message = runCatching { block() }
.exceptionOrNull()!!.message!!
assertContains(message, path)
}
}
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