Support previous encoding versions. (#901)

1 files changed, 8 insertions, 1 deletions

diff --git a/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextDeserializationTest.java b/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextDeserializationTest.java
index c465ee94..8db0e389 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextDeserializationTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextDeserializationTest.java
@@ -296,10 +296,17 @@ public class TagContextDeserializationTest {
   @Test
   public void testDeserializeWrongVersionId() throws TagContextDeserializationException {
     thrown.expect(TagContextDeserializationException.class);
-    thrown.expectMessage("Wrong Version ID: 1. Currently supported version is: 0");
+    thrown.expectMessage("Wrong Version ID: 1. Currently supports version up to: 0");
     serializer.fromByteArray(new byte[] {(byte) (SerializationUtils.VERSION_ID + 1)});
   }
 
+  @Test
+  public void testDeserializeNegativeVersionId() throws TagContextDeserializationException {
+    thrown.expect(TagContextDeserializationException.class);
+    thrown.expectMessage("Wrong Version ID: -1. Currently supports version up to: 0");
+    serializer.fromByteArray(new byte[] {(byte) -1});
+  }
+
   //     <tag_encoding> ==
   //       <tag_key_len><tag_key><tag_val_len><tag_val>
   //         <tag_key_len> == varint encoded integer