1 files changed, 48 insertions, 0 deletions
diff --git a/runtime/commonTest/src/kotlinx/serialization/UnknownElementIndexTest.kt b/runtime/commonTest/src/kotlinx/serialization/UnknownElementIndexTest.kt
new file mode 100644
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+++ b/runtime/commonTest/src/kotlinx/serialization/UnknownElementIndexTest.kt
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2019 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlinx.serialization
+
+import kotlinx.serialization.CompositeDecoder.Companion.UNKNOWN_NAME
+import kotlinx.serialization.json.*
+import kotlin.test.Test
+import kotlin.test.assertFailsWith
+
+class UnknownElementIndexTest {
+    enum class Choices {A, B, C}
+    @Serializable data class Holder(val c: Choices)
+
+    class MalformedReader: ElementValueDecoder() {
+        override fun decodeElementIndex(desc: SerialDescriptor): Int {
+            return UNKNOWN_NAME
+        }
+    }
+
+    @Test
+    fun compilerComplainsAboutIncorrectIndex() {
+        assertFailsWith(UnknownFieldException::class) {
+            MalformedReader().decode(SerialNamesTest.WithNames.serializer())
+        }
+    }
+
+    @Test
+    fun errorMessage() {
+        val message = "kotlinx.serialization.UnknownElementIndexTest.Choices does not contain element with name 'D'"
+        assertFailsWith(SerializationException::class, message) {
+            Json.parse(Holder.serializer(), """{"c":"D"}""")
+        }
+    }
+}