Add tests for fixed count option

tests/fixed_count/SConscript

+# Test that fixed count option works.
+
+Import("env")
+
+env.NanopbProto("fixed_count")
+env.Object("fixed_count.pb.c")
+
+p = env.Program(["fixed_count_unittests.c",
+                 "fixed_count.pb.c",
+                 "$COMMON/pb_encode.o",
+                 "$COMMON/pb_decode.o",
+                 "$COMMON/pb_common.o"])
+
+env.RunTest(p)

tests/fixed_count/fixed_count.proto

+/* Test nanopb fixed count option. */
+
+syntax = "proto2";
+
+import "nanopb.proto";
+
+message Message1
+{
+    repeated int32 data = 1 [(nanopb).max_count = 3, (nanopb).fixed_count = true];
+}
+
+message Message2
+{
+    repeated Message1 data = 1 [(nanopb).max_count = 2, (nanopb).fixed_count = true];
+}
+
+message Message3
+{
+    repeated Message2 data1 = 1 [(nanopb).max_count = 2, (nanopb).fixed_count = true];
+    repeated Message2 data2 = 2 [(nanopb).max_count = 2, (nanopb).fixed_count = true];
+}

tests/fixed_count/fixed_count_unittests.c

+#include <stdio.h>
+#include <string.h>
+#include <pb_decode.h>
+#include <pb_encode.h>
+#include "unittests.h"
+#include "fixed_count.pb.h"
+
+int main()
+{
+    int status = 0;
+    COMMENT("Test encoding and decoding of repeated fixed count fields");
+
+    {
+      pb_byte_t buffer[Message1_size];
+      Message1 msg_a = Message1_init_zero;
+      Message1 msg_b = Message1_init_zero;
+
+      pb_ostream_t ostream;
+      pb_istream_t istream;
+      size_t message_length;
+
+      msg_a.data[0] = 1;
+      msg_a.data[0] = 2;
+      msg_a.data[0] = 3;
+
+      ostream = pb_ostream_from_buffer(buffer, Message1_size);
+      TEST(pb_encode(&ostream, Message1_fields, &msg_a));
+      message_length = ostream.bytes_written;
+
+      istream = pb_istream_from_buffer(buffer, message_length);
+      TEST(pb_decode(&istream, Message1_fields, &msg_b));
+
+      TEST(istream.bytes_left == 0);
+      TEST(memcmp(&msg_b, &msg_a, sizeof(msg_a)) == 0);
+    }
+
+    {
+      pb_byte_t buffer[Message2_size];
+      Message2 msg_a = Message2_init_zero;
+      Message2 msg_b = Message2_init_zero;
+
+      pb_ostream_t ostream;
+      pb_istream_t istream;
+      size_t message_length;
+
+      msg_a.data[0].data[0] = 1;
+      msg_a.data[0].data[1] = 2;
+      msg_a.data[0].data[2] = 3;
+      msg_a.data[1].data[0] = 4;
+      msg_a.data[1].data[1] = 5;
+      msg_a.data[1].data[2] = 6;
+
+      ostream = pb_ostream_from_buffer(buffer, Message2_size);
+      TEST(pb_encode(&ostream, Message2_fields, &msg_a));
+      message_length = ostream.bytes_written;
+
+      istream = pb_istream_from_buffer(buffer, message_length);
+      TEST(pb_decode(&istream, Message2_fields, &msg_b));
+
+      TEST(istream.bytes_left == 0);
+      TEST(memcmp(&msg_b, &msg_a, sizeof(msg_a)) == 0);
+    }
+
+    {
+      pb_byte_t buffer[Message3_size];
+      Message3 msg_a = Message3_init_zero;
+      Message3 msg_b = Message3_init_zero;
+
+      pb_ostream_t ostream;
+      pb_istream_t istream;
+      size_t message_length;
+
+      msg_a.data1[0].data[0].data[0] = 1;
+      msg_a.data1[0].data[0].data[1] = 2;
+      msg_a.data1[0].data[0].data[2] = 3;
+      msg_a.data1[0].data[1].data[0] = 4;
+      msg_a.data1[0].data[1].data[1] = 5;
+      msg_a.data1[0].data[1].data[2] = 6;
+
+      msg_a.data1[1].data[0].data[0] = 7;
+      msg_a.data1[1].data[0].data[1] = 8;
+      msg_a.data1[1].data[0].data[2] = 9;
+      msg_a.data1[1].data[1].data[0] = 10;
+      msg_a.data1[1].data[1].data[1] = 11;
+      msg_a.data1[1].data[1].data[2] = 12;
+
+      msg_a.data2[0].data[0].data[0] = 11;
+      msg_a.data2[0].data[0].data[1] = 12;
+      msg_a.data2[0].data[0].data[2] = 13;
+      msg_a.data2[0].data[1].data[0] = 14;
+      msg_a.data2[0].data[1].data[1] = 15;
+      msg_a.data2[0].data[1].data[2] = 16;
+
+      msg_a.data2[1].data[0].data[0] = 17;
+      msg_a.data2[1].data[0].data[1] = 18;
+      msg_a.data2[1].data[0].data[2] = 19;
+      msg_a.data2[1].data[1].data[0] = 110;
+      msg_a.data2[1].data[1].data[1] = 111;
+      msg_a.data2[1].data[1].data[2] = 112;
+
+      ostream = pb_ostream_from_buffer(buffer, Message3_size);
+      TEST(pb_encode(&ostream, Message3_fields, &msg_a));
+      message_length = ostream.bytes_written;
+
+      istream = pb_istream_from_buffer(buffer, message_length);
+      TEST(pb_decode(&istream, Message3_fields, &msg_b));
+
+      TEST(istream.bytes_left == 0);
+      TEST(memcmp(&msg_b, &msg_a, sizeof(msg_a)) == 0);
+    }
+
+    if (status != 0)
+        fprintf(stdout, "\n\nSome tests FAILED!\n");
+
+    return status;
+}