1 files changed, 29 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonRootLevelNullTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonRootLevelNullTest.kt
new file mode 100644
index 00000000..69397764
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonRootLevelNullTest.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.serialization.json
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.*
+import kotlin.test.*
+
+class JsonRootLevelNullTest : JsonTestBase() {
+
+    @Serializable
+    private data class Simple(val a: Int = 42)
+
+    @Test
+    fun testNullableEncode() {
+        // Top-level nulls in tagged encoder is not yet supported, no parametrized test
+        val obj: Simple? = null
+        val json = default.encodeToString(Simple.serializer().nullable, obj)
+        assertEquals("null", json)
+    }
+
+    @Test
+    fun testNullableDecode() = parametrizedTest { jsonTestingMode ->
+        val result = default.decodeFromString(Simple.serializer().nullable, "null", jsonTestingMode)
+        assertNull(result)
+    }
+}