DATAMONGO-2250 - Add test case for Kotlin override properties.

Author: christophstrobl

spring-data-mongodb/src/test/kotlin/org/springframework/data/mongodb/core/OverridePropertyClasses.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.core
+
+import com.mongodb.MongoClient
+import org.junit.Test
+import org.springframework.data.mongodb.repository.MongoRepository
+import org.springframework.data.mongodb.repository.support.MongoRepositoryFactory
+import org.springframework.data.mongodb.test.util.Assertions.assertThat
+
+open class SuperType(open val field: Int)
+
+class SubType(val id: String, override var field: Int = 1) : SuperType(field)
+
+interface MyRepository : MongoRepository<SubType, String>
+
+class `KotlinOverridePropertyTests` {
+
+	val template = MongoTemplate(MongoClient(), "kotlin-tests")
+
+	@Test // DATAMONGO-2250
+	fun `Ambiguous field mapping for override val field`() {
+
+		val repository = MongoRepositoryFactory(template).getRepository(MyRepository::class.java)
+
+		var subType = SubType("id-1")
+		subType.field = 3
+
+		repository.save(subType)
+
+		assertThat(repository.findById(subType.id).get().field).isEqualTo(subType.field)
+	}
+}