Missing try-before-set tests for datasink in etdumpgen tests

[Gasoonjia]

🚀 The feature, motivation, and pitch

try-before-set tests are important for etdumpgen which avoids unexpected phenomenon when user using debug_buffer or datasink before setting it.

However right now we only have it in debug_buffer, but not in datasink

executorch/devtools/etdump/tests/etdump_test.cpp

Line 514 in 31d3545

// TODO(gasoonjia): add similar ET_EXPECT_DEATH on BufferDataSink branch

The reason is, debug_buffer and datasinks are using a same etdumpgen in every inner for loop; after the first round even though we haven't set the datasink, it already has debug buffer that can handle the debug data dumping, so that error will not be raised.

possible solution

One solution is for every for-loop round, instead of sharing the same etdumpgen, we can use a different one, to bypass the issue.

We are open to any other solutions!

Please kindly leave your comments under the issue, or reach out to us via discord https://github.com/pytorch/executorch?tab=readme-ov-file#contributing, if you have any quesion.

[keyprocedure]

I’ll work on this and submit a PR once it’s ready