Add test for @JsonAnySetter deserialization failure in 2.18.0

Author: dinomite

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub832.kt

@@ -0,0 +1,32 @@
+package com.fasterxml.jackson.module.kotlin.test.github
+
+import com.fasterxml.jackson.annotation.JsonAnyGetter
+import com.fasterxml.jackson.annotation.JsonAnySetter
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.KotlinModule
+import com.fasterxml.jackson.module.kotlin.readValue
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class GitHub832 {
+    data class AnySetter @JvmOverloads constructor(
+        val test: String? = null,
+        @JsonAnySetter
+        @get:JsonAnyGetter
+        val anything: Map<String, Any?> = mutableMapOf(),
+    )
+
+    @Test
+    fun testDeserialization() {
+        val json = """
+            {
+                "widget": {
+                    "debug": "on"
+                 }
+             }     """.trimMargin()
+        val jacksonMapper = ObjectMapper()
+        jacksonMapper.registerModules(KotlinModule.Builder().build())
+        val anySetter = jacksonMapper.readValue<AnySetter>(json)
+        assertEquals("widget", anySetter.anything.entries.first().key)
+    }
+}