Minor rewrite of test from #4012, to easy merge to master

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/deser/jdk/LocaleDeser4009Test.java

@@ -1,47 +1,26 @@
 package com.fasterxml.jackson.databind.deser.jdk;
 
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.BaseMapTest;
-import com.fasterxml.jackson.databind.DeserializationFeature;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.ObjectReader;
 import java.util.Locale;
 
+import com.fasterxml.jackson.databind.*;
+
 // [databind#4009] Locale "" is deserialised as NULL if ACCEPT_EMPTY_STRING_AS_NULL_OBJECT is true
 public class LocaleDeser4009Test extends BaseMapTest 
 {
-
-    static class MyPojo {
-        public String field;
-    }
-    final ObjectMapper mapper = newJsonMapper();
-    
-    final ObjectReader DISABLED_READER = mapper.reader()
-            .without(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
-    
-    final ObjectReader ENABLED_READER = mapper.reader()
-            .with(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
-
-    public void testPOJOWithFeatureDisabled() 
-    {
-        assertThrows(JsonProcessingException.class, () -> {
-            DISABLED_READER.readValue("\"\"", MyPojo.class);
-        });
-    }
-
-    public void testPOJOWithFeatureEnabled() throws Exception 
-    {
-        assertNull(ENABLED_READER.readValue("\"\"", MyPojo.class));
-    }
+    private final ObjectMapper MAPPER = newJsonMapper();
 
     public void testLocaleWithFeatureDisabled() throws Exception 
     {
-        assertEquals(Locale.ROOT, DISABLED_READER.readValue("\"\"", Locale.class));
+        assertEquals(Locale.ROOT,
+                MAPPER.readerFor(Locale.class)
+                    .without(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT)
+                        .readValue("\"\""));
     }
 
     public void testLocaleWithFeatureEnabled() throws Exception 
     {
-        assertNull(ENABLED_READER.readValue("\"\"", Locale.class));
+        assertNull(MAPPER.readerFor(Locale.class)
+                .with(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT)
+                    .readValue("\"\""));
     }
 }