[C++] Add test for flatbuffers serialization

[amoeba]

This is a draft PR that shouldn't get merged.

This is testing the test described in #40361. Once the test has done its job on CI, I'll add a follow-up commit to make the test pass by updating the affected code. Once that happens, I'll add the test to the PR for #40361 and we can merge it.

Rationale for this change

The test should have different result on different platforms in CI which will help us show that any regression test we add to #40361 will do its job.

What changes are included in this PR?

New test.

Are these changes tested?

No, this PR is for testing on CI.

Are there any user-facing changes?

No.

[github-actions]

Thanks for opening a pull request!

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[amoeba]

The test added by this PR succeeds on macOS (where I generated the test data) and fails on my Linux machine so I think that's a start. I'll wait for CI and return to this when that's all been run.

[pitrou]

@github-actions crossbow submit -g cpp

[github-actions]

Revision: 2e32daa

Submitted crossbow builds: ursacomputing/crossbow @ actions-fb843adca5

Task	Status
test-alpine-linux-cpp
test-build-cpp-fuzz
test-conda-cpp
test-conda-cpp-valgrind
test-cuda-cpp
test-debian-12-cpp-amd64
test-debian-12-cpp-i386
test-fedora-39-cpp
test-ubuntu-20.04-cpp
test-ubuntu-20.04-cpp-bundled
test-ubuntu-20.04-cpp-minimal-with-formats
test-ubuntu-20.04-cpp-thread-sanitizer
test-ubuntu-22.04-cpp
test-ubuntu-22.04-cpp-20
test-ubuntu-22.04-cpp-no-threading
test-ubuntu-24.04-cpp
test-ubuntu-24.04-cpp-gcc-14

[pitrou]

Ok, the test nicely fails on a number of C++ builds :-)

[amoeba]

That's good, thanks for taking a look @pitrou. Do you think this is in good enough shape to add to #40392?

[pitrou]

Yes, it is. Thank you @amoeba !