try to fix odd CI test fail

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/BaseMapTest.java

@@ -280,13 +280,13 @@ protected String serializeAsString(ObjectMapper m, Object value)
     protected String serializeAsString(Object value)
         throws IOException
     {
-        return serializeAsString(SHARED_MAPPER, value);
+        return serializeAsString(objectMapper(), value);
     }
 
     protected String asJSONObjectValueString(Object... args)
         throws IOException
     {
-        return asJSONObjectValueString(SHARED_MAPPER, args);
+        return asJSONObjectValueString(objectMapper(), args);
     }
 
     protected String asJSONObjectValueString(ObjectMapper m, Object... args)
@@ -308,7 +308,7 @@ protected String asJSONObjectValueString(ObjectMapper m, Object... args)
     protected <T> T readAndMapFromString(String input, Class<T> cls)
         throws IOException
     {
-        return readAndMapFromString(SHARED_MAPPER, input, cls);
+        return readAndMapFromString(objectMapper(), input, cls);
     }
 
     protected <T> T readAndMapFromString(ObjectMapper m, String input, Class<T> cls) throws IOException

src/test/java/com/fasterxml/jackson/databind/views/TestViewSerialization.java

@@ -159,7 +159,7 @@ public void testDefaultExclusion() throws IOException
      */
     public void testImplicitAutoDetection() throws Exception
     {
-    	assertEquals("{\"a\":1}", serializeAsString(new ImplicitBean()));
+        assertEquals("{\"a\":1}", objectMapper().writeValueAsString(new ImplicitBean()));
     }
 
     public void testVisibility() throws Exception