1 files changed, 32 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/features/UseSerializersTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/features/UseSerializersTest.kt
new file mode 100644
index 00000000..b5f332d7
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/features/UseSerializersTest.kt
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+@file:UseSerializers(MultiplyingIntHolderSerializer::class, MultiplyingIntSerializer::class)
+
+package kotlinx.serialization.features
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
+import kotlin.test.*
+
+@Serializable
+data class Carrier2(
+    val a: IntHolder,
+    val i: Int,
+    val nullable: Int?,
+    val nullableIntHolder: IntHolder?,
+    val nullableIntList: List<Int?> = emptyList(),
+    val nullableIntHolderNullableList: List<IntHolder?>? = null
+)
+
+class UseSerializersTest {
+    @Test
+    fun testOnFile() {
+        val str = Json { encodeDefaults = true }.encodeToString(
+            Carrier2.serializer(),
+            Carrier2(IntHolder(42), 2, 2, IntHolder(42))
+        )
+        assertEquals("""{"a":84,"i":4,"nullable":4,"nullableIntHolder":84,"nullableIntList":[],"nullableIntHolderNullableList":null}""", str)
+    }
+}