Add regression test for issue #253

tests/regression/issue_253/SConscript

+# Regression test for Issue 253: Wrong calculated message maximum size
+
+Import('env')
+
+env.NanopbProto('short_array')
+
+p = env.Program(['short_array.c',
+                 'short_array.pb.c', 
+                 "$COMMON/pb_decode.o",
+                 "$COMMON/pb_encode.o",
+                 "$COMMON/pb_common.o"])
+
+env.RunTest(p)
+
+

tests/regression/issue_253/short_array.c

+#include <unittests.h>
+#include <pb_encode.h>
+#include "short_array.pb.h"
+
+int main()
+{
+    int status = 0;
+    
+    COMMENT("Test message length calculation for short arrays");
+    {
+        uint8_t buffer[TestMessage_size] = {0};
+        pb_ostream_t ostream = pb_ostream_from_buffer(buffer, TestMessage_size);
+        TestMessage msg = TestMessage_init_zero;
+        
+        msg.rep_uint32_count = 1;
+        msg.rep_uint32[0] = (1 << 31);
+        
+        TEST(pb_encode(&ostream, TestMessage_fields, &msg));
+        TEST(ostream.bytes_written == TestMessage_size);
+    }
+    
+    return status;
+}
+

tests/regression/issue_253/short_array.proto

+syntax = "proto2";
+import "nanopb.proto";
+
+message TestMessage {
+    repeated uint32 rep_uint32 = 1 [(nanopb).max_count = 1];
+}
+