Add regression test for issue #395
diff --git a/tests/regression/issue_395/SConscript b/tests/regression/issue_395/SConscript
new file mode 100644
index 0000000..8bc1030
--- /dev/null
+++ b/tests/regression/issue_395/SConscript
@@ -0,0 +1,14 @@
+# Regression test for #395:
+# Unexpected empty submessage in proto3 mode
+
+Import("env")
+
+env.NanopbProto(["test.proto", "test.options"])
+testprog = env.Program(["test.c",
+ "test.pb.c",
+ "$COMMON/pb_encode.o",
+ "$COMMON/pb_decode.o",
+ "$COMMON/pb_common.o"])
+
+env.RunTest(testprog)
+
diff --git a/tests/regression/issue_395/test.c b/tests/regression/issue_395/test.c
new file mode 100644
index 0000000..9578caf
--- /dev/null
+++ b/tests/regression/issue_395/test.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pb_encode.h>
+#include <pb_decode.h>
+#include "test.pb.h"
+#include "unittests.h"
+
+int main(int argc, char **argv)
+{
+ int status = 0;
+ uint8_t buffer[512] = {0};
+ int i;
+ pb_ostream_t ostream;
+
+ Reply reply = Reply_init_zero;
+ Reply_Result request_result = Reply_Result_OK;
+
+ ostream = pb_ostream_from_buffer(buffer, sizeof(buffer));
+ reply.result = request_result;
+ if (!pb_encode(&ostream, Reply_fields, &reply)) {
+ fprintf(stderr, "Encode failed: %s\n", PB_GET_ERROR(&ostream));
+ return 1;
+ }
+
+ printf("response payload (%d):", (int)ostream.bytes_written);
+ for (i = 0; i < ostream.bytes_written; i++) {
+ printf("%02X", buffer[i]);
+ }
+ printf("\n");
+
+ TEST(ostream.bytes_written == 2);
+ TEST(buffer[0] == 0x08);
+ TEST(buffer[1] == 0x01);
+
+ return status;
+}
+
diff --git a/tests/regression/issue_395/test.options b/tests/regression/issue_395/test.options
new file mode 100644
index 0000000..437d58e
--- /dev/null
+++ b/tests/regression/issue_395/test.options
@@ -0,0 +1,3 @@
+* proto3_singular_msgs:true
+SubSubAMessage.somestring max_size:64
+SubSubBMessage.somestring max_size:64
diff --git a/tests/regression/issue_395/test.proto b/tests/regression/issue_395/test.proto
new file mode 100644
index 0000000..91bf371
--- /dev/null
+++ b/tests/regression/issue_395/test.proto
@@ -0,0 +1,37 @@
+syntax = "proto3";
+
+message Error
+{
+ int32 code = 1;
+ string message = 2;
+}
+
+message SubSubAMessage
+{
+ string somestring = 1;
+}
+
+message SubSubBMessage
+{
+ string somestring = 1;
+}
+
+message SubMessage
+{
+ SubSubAMessage subsubmessageA = 1;
+ repeated SubSubBMessage subsubmessageB = 2;
+}
+
+message Reply
+{
+ enum Result
+ {
+ ERROR = 0;
+ OK = 1;
+ SOME_A = 2;
+ }
+
+ Result result = 1;
+ Error error = 2;
+ SubMessage submessage = 3;
+}
