Add UTF-16 surrogate pair decode support

- Add tests for UTF-16 decoding and failures
- Add getutf8.pl to assist with UTF-16 decode testing

- Re-add test_decode_cycle() which was accidentally removed earlier
- Rename bytestring.dat to octets-escaped.dat

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/common.lua b/tests/common.lua
index 9a7ed19..b8ce01d 100644
--- a/tests/common.lua
+++ b/tests/common.lua
@@ -99,6 +99,10 @@ function file_load(filename)
     local data = file:read("*a")
     file:close()
 
+    if data == nil then
+        error("Failed to read " .. filename)
+    end
+
     return data
 end