Add tests, fix, for protobuf parser

Author: cowtowncoder

protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/ProtobufParser.java

@@ -1395,6 +1395,9 @@ public String getValueAsString() throws IOException
             }
             return _textBuffer.contentsAsString();
         }
+        if (_currToken == JsonToken.FIELD_NAME) {
+            return currentName();
+        }
         if (_currToken == null || _currToken == JsonToken.VALUE_NULL || !_currToken.isScalarValue()) {
             return null;
         }
@@ -1405,6 +1408,9 @@ public String getValueAsString() throws IOException
     public String getValueAsString(String defaultValue) throws IOException
     {
         if (_currToken != JsonToken.VALUE_STRING) {
+            if (_currToken == JsonToken.FIELD_NAME) {
+                return currentName();
+            }
             if (_currToken == null || _currToken == JsonToken.VALUE_NULL || !_currToken.isScalarValue()) {
                 return defaultValue;
             }

protobuf/src/test/java/com/fasterxml/jackson/dataformat/protobuf/ReadSimpleTest.java

@@ -137,12 +137,18 @@ public void testReadPointLong() throws Exception
             assertNull(p.currentName());
             assertToken(JsonToken.FIELD_NAME, p.nextToken());
             assertEquals("x", p.currentName());
+            assertEquals("x", p.getText());
+            assertEquals("x", p.getValueAsString());
+            assertEquals("x", p.getValueAsString("y"));
             assertToken(JsonToken.VALUE_NUMBER_INT, p.nextToken());
             assertEquals(NumberType.LONG, p.getNumberType());
             assertEquals(NumberTypeFP.UNKNOWN, p.getNumberTypeFP());
             assertEquals(input.x, p.getIntValue());
             assertToken(JsonToken.FIELD_NAME, p.nextToken());
             assertEquals("y", p.currentName());
+            assertEquals("y", p.getText());
+            assertEquals("y", p.getValueAsString());
+            assertEquals("y", p.getValueAsString("abc"));
             assertToken(JsonToken.VALUE_NUMBER_INT, p.nextToken());
             assertEquals(input.y, p.getIntValue());
             assertToken(JsonToken.END_OBJECT, p.nextToken());