add big decimal tests

[pjfanning]

Currently broken. CBOR and Smile tests based on FasterXML/jackson-databind#4917

These are round trip tests and I would have expected that the binary data that is serialized to be ok to read back (deserialized).

The tests fail with exceptions like:

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.math.BigDecimal` from Object value (token `JsonToken.FIELD_NAME`)
 at [Source: (byte[])[46 bytes]; byte offset: #16] (through reference chain: com.fasterxml.jackson.dataformat.cbor.mapper.NumberBeanTest$DeserializationIssue4917["decimalHolder"])

	at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
	at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1794)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1568)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1515)
	at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$BigDecimalDeserializer.deserialize(NumberDeserializers.java:1034)
	at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$BigDecimalDeserializer.deserialize(NumberDeserializers.java:988)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1492)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:348)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:185)

[pjfanning]

@cowtowncoder I don't a great deal about CBOR and Smile but I thought these scenarios should have worked without too much stress. Would you have a look?

[cowtowncoder]

That looks very odd -- tests do indeed look simple. I'll need to dig deeper later on.

One thing that might help is to try to create alternate tests that just use streaming API, trying to replicate what databind does. There must be some incomplete state update somewhere.
Interesting that both CBOR and Smile have (it seems) same issue.

EDIT: I was too quick -- test itself has an issue, see below.

[cowtowncoder]

@pjfanning Ah. Tests are not valid -- it's not round-tripping: Serialization with wrapper is as

{
  "decimalHolder" : {
    "value" : 1E+2
  },
  "number" : 50.0
}

but due to

@JsonCreator(mode = JsonCreator.Mode.DELEGATING)
        static DecimalHolder4917 of(BigDecimal value) {
            return new DecimalHolder4917(value);
        }

deserializer instead expects structure like:

{
  "decimalHolder" :  1E+2
  "number" : 50.0
}

so it's DELEGATING vs actually PROPERTIES style serialization.

Same problem would happen with JSON and other formats.

[cowtowncoder]

@pjfanning I fixed the tests by adding @JsonValue to make serialization work the way deserialization expects.