1 files changed, 62 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonUpdateModeTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonUpdateModeTest.kt
new file mode 100644
index 00000000..eccef39d
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonUpdateModeTest.kt
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.serialization.json
+
+import kotlinx.serialization.*
+import kotlin.test.*
+
+class JsonOverwriteTest : JsonTestBase() {
+    @Serializable
+    data class Updatable1(val l: List<Int>)
+
+    @Serializable
+    data class Data(val a: Int)
+
+    @Serializable
+    data class Updatable2(val l: List<Data>)
+
+    @Serializable
+    data class NullableInnerIntList(val data: List<Int?>)
+
+    @Serializable
+    data class NullableUpdatable(val data: List<Data>?)
+
+    @Test
+    fun testCanUpdatePrimitiveList() = parametrizedTest { jsonTestingMode ->
+        val parsed =
+            lenient.decodeFromString<Updatable1>(Updatable1.serializer(), """{"l":[1,2],"f":"foo","l":[3,4]}""", jsonTestingMode)
+        assertEquals(Updatable1(listOf(3, 4)), parsed)
+    }
+
+    @Test
+    fun testCanUpdateObjectList() = parametrizedTest { jsonTestingMode ->
+        val parsed = lenient.decodeFromString<Updatable2>(
+            Updatable2.serializer(),
+            """{"f":"bar","l":[{"a":42}],"l":[{"a":43}]}""",
+            jsonTestingMode
+        )
+        assertEquals(Updatable2(listOf(Data(43))), parsed)
+    }
+
+    @Test
+    fun testCanUpdateNullableValuesInside() = parametrizedTest { jsonTestingMode ->
+        val a1 = default.decodeFromString(NullableInnerIntList.serializer(), """{"data":[null],"data":[1]}""", jsonTestingMode)
+        assertEquals(NullableInnerIntList(listOf(1)), a1)
+        val a2 = default.decodeFromString(NullableInnerIntList.serializer(), """{"data":[42],"data":[null]}""", jsonTestingMode)
+        assertEquals(NullableInnerIntList(listOf(null)), a2)
+        val a3 = default.decodeFromString(NullableInnerIntList.serializer(), """{"data":[31],"data":[1]}""", jsonTestingMode)
+        assertEquals(NullableInnerIntList(listOf(1)), a3)
+    }
+
+    @Test
+    fun testCanUpdateNullableValues() = parametrizedTest { jsonTestingMode ->
+        val a1 = lenient.decodeFromString(NullableUpdatable.serializer(), """{"data":null,"data":[{"a":42}]}""", jsonTestingMode)
+        assertEquals(NullableUpdatable(listOf(Data(42))), a1)
+        val a2 = lenient.decodeFromString(NullableUpdatable.serializer(), """{"data":[{a:42}],"data":null}""", jsonTestingMode)
+        assertEquals(NullableUpdatable(null), a2)
+        val a3 = lenient.decodeFromString(NullableUpdatable.serializer(), """{"data":[{a:42}],"data":[{"a":43}]}""", jsonTestingMode)
+        assertEquals(NullableUpdatable(listOf(Data(43))), a3)
+    }
+}