1 files changed, 41 insertions, 0 deletions
diff --git a/formats/json-tests/jvmTest/src/kotlinx/serialization/features/ContextualSerializationOnFileTest.kt b/formats/json-tests/jvmTest/src/kotlinx/serialization/features/ContextualSerializationOnFileTest.kt
new file mode 100644
index 00000000..a190a483
--- /dev/null
+++ b/formats/json-tests/jvmTest/src/kotlinx/serialization/features/ContextualSerializationOnFileTest.kt
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+// TODO: Move to common tests after https://youtrack.jetbrains.com/issue/KT-28927 is fixed
+
+@file:UseContextualSerialization(Int::class, IntHolder::class)
+
+package kotlinx.serialization.features
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
+import kotlinx.serialization.modules.*
+import kotlin.test.*
+
+@Serializable
+data class Carrier3(
+    val a: IntHolder,
+    val i: Int,
+    val nullable: Int?,
+    val nullableIntHolder: IntHolder?,
+    val nullableIntList: List<Int?> = emptyList(),
+    val nullableIntHolderNullableList: List<IntHolder?>? = null
+)
+
+class ContextualSerializationOnFileTest {
+    val module = SerializersModule {
+        contextual(DividingIntSerializer)
+        contextual(MultiplyingIntHolderSerializer)
+    }
+    val json = Json { serializersModule = module; encodeDefaults = true }
+
+    @Test
+    fun testOnFile() {
+        val str = json.encodeToString(Carrier3.serializer(), Carrier3(IntHolder(42), 8, 8, IntHolder(42)))
+        assertEquals(
+            """{"a":84,"i":4,"nullable":4,"nullableIntHolder":84,"nullableIntList":[],"nullableIntHolderNullableList":null}""",
+            str
+        )
+    }
+}