Add serialization test with generics

ktor-client/ktor-client-tests/build.gradle.kts

@@ -59,6 +59,7 @@ kotlin.sourceSets {
             api(project(":ktor-server:ktor-server-jetty"))
             api(project(":ktor-features:ktor-auth"))
             api(project(":ktor-features:ktor-websockets"))
+            api(project(":ktor-features:ktor-serialization"))
             api("ch.qos.logback:logback-classic:$logback_version")
             api("junit:junit:$junit_version")
             api("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")

ktor-client/ktor-client-tests/common/test/io/ktor/client/tests/JsonTest.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2014-2020 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package io.ktor.client.tests
+
+import io.ktor.client.features.json.*
+import io.ktor.client.features.json.serializer.*
+import io.ktor.client.request.*
+import io.ktor.client.tests.utils.*
+import kotlinx.serialization.*
+import kotlin.test.*
+
+class JsonTest : ClientLoader() {
+
+
+    @Serializable
+    data class User(val name: String)
+
+    @Serializable
+    @Polymorphic
+    data class Result<T>(val message: String, val data: T)
+
+    @OptIn(ImplicitReflectionSerializer::class, ExperimentalStdlibApi::class)
+    @Test
+    fun testUserGenerics() = clientTests(listOf("js")) {
+        config {
+            install(JsonFeature) {
+                serializer = KotlinxSerializer()
+            }
+        }
+
+        test { client ->
+            val expected = Result<User>("ok", User("hello"))
+            val response = client.get<Result<User>>("$TEST_SERVER/json/user-generic")
+
+            assertEquals(expected, response)
+        }
+    }
+}

ktor-client/ktor-client-tests/jvm/src/io/ktor/client/tests/utils/ClientTestServer.kt

@@ -34,6 +34,7 @@ internal fun Application.tests() {
     buildersTest()
     downloadTest()
     uploadTest()
+    jsonTest()
 
     routing {
         post("/echo") {

ktor-client/ktor-client-tests/jvm/src/io/ktor/client/tests/utils/tests/Json.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2014-2020 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package io.ktor.client.tests.utils.tests
+
+import io.ktor.application.*
+import io.ktor.http.*
+import io.ktor.response.*
+import io.ktor.routing.*
+
+
+fun Application.jsonTest() {
+    routing {
+        route("json") {
+            get("user-generic") {
+                call.respondText(
+                    """
+                    {
+                        "message": "ok",
+                        "data": { "name": "hello" }
+                    }
+                """.trimIndent(), contentType = ContentType.Application.Json
+                )
+            }
+        }
+    }
+}