Modify the alltypes test to check re-encoding through protoc.

This way we can verify that the message is encoded exactly the same way
as the official protobuf implementation would do it.

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/alltypes/SConscript b/tests/alltypes/SConscript
index 1dc6f87..9c9072b 100644
--- a/tests/alltypes/SConscript
+++ b/tests/alltypes/SConscript
@@ -7,6 +7,29 @@ env.NanopbProto(["alltypes", "alltypes.options"])
 enc = env.Program(["encode_alltypes.c", "alltypes.pb.c", "$COMMON/pb_encode.o"])
 dec = env.Program(["decode_alltypes.c", "alltypes.pb.c", "$COMMON/pb_decode.o"])
 
+# Test the round-trip from nanopb encoder to nanopb decoder
 env.RunTest(enc)
 env.RunTest([dec, "encode_alltypes.output"])
 
+# Re-encode the data using protoc, and check that the results from nanopb
+# match byte-per-byte to the protoc output.
+env.Decode("encode_alltypes.output.decoded",
+           ["encode_alltypes.output", "alltypes.proto"],
+           MESSAGE='AllTypes')
+env.Encode("encode_alltypes.output.recoded",
+           ["encode_alltypes.output.decoded", "alltypes.proto"],
+           MESSAGE='AllTypes')
+env.Compare(["encode_alltypes.output", "encode_alltypes.output.recoded"])
+
+# Do the same checks with the optional fields present.
+env.RunTest("optionals.output", enc, ARGS = ['1'])
+env.RunTest("optionals.decout", [dec, "optionals.output"], ARGS = ['1'])
+env.Decode("optionals.output.decoded",
+           ["optionals.output", "alltypes.proto"],
+           MESSAGE='AllTypes')
+env.Encode("optionals.output.recoded",
+           ["optionals.output.decoded", "alltypes.proto"],
+           MESSAGE='AllTypes')
+env.Compare(["optionals.output", "optionals.output.recoded"])
+
+