Backport #620 into 2.x

Author: cowtowncoder

ion/src/test/java/com/fasterxml/jackson/dataformat/ion/ionvalue/IonValueDeserializerTest.java

@@ -1,6 +1,6 @@
 package com.fasterxml.jackson.dataformat.ion.ionvalue;
 
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Objects;
 
@@ -25,7 +25,7 @@
 
 public class IonValueDeserializerTest {
     private static class Data<T> {
-        private final Map<String, T> map = new HashMap<>();
+        private final Map<String, T> map = new LinkedHashMap<>();
 
         protected Data() { }