Fix #3522: support serialization of ByteArrayOutputStream instances

Author: cowtowncoder

release-notes/VERSION

@@ -62,6 +62,7 @@ Versions: 3.x (for earlier see VERSION-2.x)
 #3046: Rename `JsonSerializable` as `JacksonSerializable`
 #3047: Rename `Bean[De]SerializerModifier` as `Value[De]SerializerModifier`
 #3070: Change default for `SerializationFeature.FAIL_ON_EMPTY_BEANS` to `false`
+#3522: Support serializing `ByteArrayOutputStream` as "simple" Binary value
 #3536: Create new exception type `JsonNodeException` for use by `JsonNode`-related problems
 #3542: Rename "com.fasterxml.jackson" -> "tools.jackson"
 #3561: Add `DeserializationContext` as an argument for `SettableBeanProperty.set(...)`

src/test/java/tools/jackson/databind/ser/jdk/JDKTypeSerializationTest.java

@@ -258,4 +258,15 @@ public void testThreadSerialization() throws Exception
         assertNotNull(cl);
         assertEquals(0, cl.size());
     }
+
+    // [databind#3522]: ByteArrayOutputStream 
+    @Test
+    public void testByteArrayOutputStreamSerialization() throws Exception
+    {
+        byte[] bytes = new byte[] { 1, 11, 111 };
+        final String exp = MAPPER.writeValueAsString(bytes);
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        baos.write(bytes);
+        assertEquals(exp, MAPPER.writeValueAsString(baos));
+    }
 }

src/test/java/tools/jackson/databind/ser/jdk/JavaUtilDateSerializationTest.java

@@ -433,10 +433,4 @@ private void serialize(ObjectWriter w, Object date, List<String> expected) throw
         String result = w.writeValueAsString(date);
         assertTrue(expected.contains(result), "unexpected result: " + result);
     }
-
-    private String zoneOffset(String raw) {
-        // Add colon or not -- difference between 2.10 and earlier, 2.11 and later
-        return raw.substring(0, 2) + ":" + raw.substring(2); // 2.11 and later
-//        return raw; // 2.10 and earlier
-    }
 }