Added support for null values for nullable enums in lanient mode (#2176)

Fixed #2170

Co-authored-by: Leonid Startsev <sandwwraith@users.noreply.github.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonCoerceInputValuesTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonCoerceInputValuesTest.kt
index fd8d516c..ecb946cb 100644
--- a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonCoerceInputValuesTest.kt
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonCoerceInputValuesTest.kt
@@ -5,7 +5,6 @@
 package kotlinx.serialization.json
 
 import kotlinx.serialization.*
-import kotlinx.serialization.json.internal.*
 import kotlinx.serialization.test.assertFailsWithSerial
 import kotlin.test.*
 
@@ -25,6 +24,11 @@ class JsonCoerceInputValuesTest : JsonTestBase() {
         val foo: String
     )
 
+    @Serializable
+    data class NullableEnumHolder(
+        val enum: SampleEnum?
+    )
+
     val json = Json {
         coerceInputValues = true
         isLenient = true
@@ -99,4 +103,13 @@ class JsonCoerceInputValuesTest : JsonTestBase() {
             assertEquals(expected, json.decodeFromString(MultipleValues.serializer(), input), "Failed on input: $input")
         }
     }
+
+    @Test
+    fun testNullSupportForEnums() = parametrizedTest(json) {
+        var decoded = decodeFromString<NullableEnumHolder>("""{"enum": null}""")
+        assertNull(decoded.enum)
+
+        decoded = decodeFromString<NullableEnumHolder>("""{"enum": OptionA}""")
+        assertEquals(SampleEnum.OptionA, decoded.enum)
+    }
 }