add failing test case for issue #270

Author: apatrida

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/failing/Github270.kt

@@ -0,0 +1,19 @@
+package com.fasterxml.jackson.module.kotlin.test.failing
+
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class TestGithub270 {
+    data class Wrapper(private val field: String) {
+        val upper = field.toUpperCase()
+        fun field() = field
+        fun stillAField() = field
+    }
+
+    @Test
+    fun testPublicFieldOverlappingFunction() {
+        val json = jacksonObjectMapper().writeValueAsString(Wrapper("Hello"))
+        assertEquals("""{"upper":"HELLO"}""", json)
+    }
+}