1 files changed, 49 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/features/sealed/SealedDiamondTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/features/sealed/SealedDiamondTest.kt
new file mode 100644
index 00000000..6ba4713b
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/features/sealed/SealedDiamondTest.kt
@@ -0,0 +1,49 @@
+package kotlinx.serialization.features.sealed
+
+import kotlinx.serialization.*
+import kotlinx.serialization.descriptors.*
+import kotlinx.serialization.json.*
+import kotlin.test.*
+
+class SealedDiamondTest : JsonTestBase() {
+
+    @Serializable
+    sealed interface A {}
+
+    @Serializable
+    sealed interface B : A {}
+
+    @Serializable
+    sealed interface C : A {}
+
+    @Serializable
+    @SerialName("X")
+    data class X(val i: Int) : B, C
+
+    @Serializable
+    @SerialName("Y")
+    object Y : B, C
+
+    @SerialName("E")
+    enum class E : B, C {
+        Q, W
+    }
+
+    @Test
+    fun testMultipleSuperSealedInterfacesDescriptor() {
+        val subclasses = A.serializer().descriptor.getElementDescriptor(1).elementDescriptors.map { it.serialName }
+        assertEquals(listOf("E", "X", "Y"), subclasses)
+    }
+
+    @Test
+    fun testMultipleSuperSealedInterfaces() {
+        @Serializable
+        data class Carrier(val a: A, val b: B, val c: C)
+        assertJsonFormAndRestored(
+            Carrier.serializer(),
+            Carrier(X(1), X(2), Y),
+            """{"a":{"type":"X","i":1},"b":{"type":"X","i":2},"c":{"type":"Y"}}"""
+        )
+    }
+
+}