1 files changed, 27 insertions, 1 deletions
diff --git a/formats/protobuf/commonTest/src/kotlinx/serialization/protobuf/schema/SchemaValidationsTest.kt b/formats/protobuf/commonTest/src/kotlinx/serialization/protobuf/schema/SchemaValidationsTest.kt
index b7332312..03302502 100644
--- a/formats/protobuf/commonTest/src/kotlinx/serialization/protobuf/schema/SchemaValidationsTest.kt
+++ b/formats/protobuf/commonTest/src/kotlinx/serialization/protobuf/schema/SchemaValidationsTest.kt
@@ -3,7 +3,6 @@ package kotlinx.serialization.protobuf.schema
 import kotlinx.serialization.*
 import kotlinx.serialization.protobuf.*
 import kotlin.test.Test
-import kotlin.test.assertContains
 import kotlin.test.assertFailsWith
 
 class SchemaValidationsTest {
@@ -39,6 +38,33 @@ class SchemaValidationsTest {
         SECOND
     }
 
+    @Serializable
+    enum class EnumWithExplicitProtoNumberDuplicate {
+        @ProtoNumber(2)
+        FIRST,
+        @ProtoNumber(2)
+        SECOND,
+    }
+
+    @Serializable
+    enum class EnumWithImplicitProtoNumberDuplicate {
+        FIRST,
+        @ProtoNumber(0)
+        SECOND,
+    }
+
+    @Test
+    fun testExplicitDuplicateEnumElementProtoNumber() {
+        val descriptors = listOf(EnumWithExplicitProtoNumberDuplicate.serializer().descriptor)
+        assertFailsWith(IllegalArgumentException::class) { ProtoBufSchemaGenerator.generateSchemaText(descriptors) }
+    }
+
+    @Test
+    fun testImplicitDuplicateEnumElementProtoNumber() {
+        val descriptors = listOf(EnumWithImplicitProtoNumberDuplicate.serializer().descriptor)
+        assertFailsWith(IllegalArgumentException::class) { ProtoBufSchemaGenerator.generateSchemaText(descriptors) }
+    }
+
     @Test
     fun testInvalidEnumElementSerialName() {
         val descriptors = listOf(InvalidEnumElementName.serializer().descriptor)