mock: add doctests for on_register_dispatch negative cases#3416
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In order to add a regression test, #3379 added support to `tracing-mock` to expect calls to `on_register_dispatch` for both mock subscribers and mock layers. A negative integration test for the layer case was included in #3415. However, there are no negative doctests for this (and as per my own suggestion, there's no negative test for the subscriber method either as I wasn't sure it was possible). After a bit of thought, I realised that we could include a negative test for the `MockSubscriber`. This change adds that test as a doctest, since we have those in almost all of our documentation and also includes the already written negative test for the `MockLayer` to a doctest.
jplatte
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# 0.1.0-beta.2 (November 30, 2025) ### Added - Add `on_register_dispatch` expectation for subscriber and layer mocks ([#3415]) - Add doctests for `on_register_dispatch` negative cases ([#3416]) [#3415]: https://github.com/tokio-rs/tracing/pull/#3415 [#3416]: https://github.com/tokio-rs/tracing/pull/#3416
hds
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# 0.1.0-beta.2 (November 26, 2025) ### Added - Add `on_register_dispatch` expectation for subscriber and layer mocks ([#3415]) - Add doctests for `on_register_dispatch` negative cases ([#3416]) ### Changed - `tracing`: updated to 0.1.42 ([#3418]) [#3415]: https://github.com/tokio-rs/tracing/pull/#3415 [#3416]: https://github.com/tokio-rs/tracing/pull/#3416 [#3418]: https://github.com/tokio-rs/tracing/pull/#3418
hds
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# 0.1.0-beta.2 (November 26, 2025) ### Added - Add `on_register_dispatch` expectation for subscriber and layer mocks ([#3415]) - Add doctests for `on_register_dispatch` negative cases ([#3416]) ### Changed - `tracing`: updated to 0.1.42 ([#3418]) [#3415]: https://github.com/tokio-rs/tracing/pull/#3415 [#3416]: https://github.com/tokio-rs/tracing/pull/#3416 [#3418]: https://github.com/tokio-rs/tracing/pull/#3418
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Motivation
In order to add a regression test, #3379 added support to
tracing-mockto expect calls to
on_register_dispatchfor both mock subscribers andmock layers. A negative integration test for the layer case was included
in #3415. However, there are no negative doctests for this (and as per
my own suggestion, there's no negative test for the subscriber method
either as I wasn't sure it was possible).
Solution
After a bit of thought, I realised that we could include a negative test
for the
MockSubscriber. This change adds that test as a doctest, sincewe have those in almost all of our documentation and also includes the
already written negative test for the
MockLayerto a doctest.