How to run single rust test?

On the new readme for ninja tools this are the test instructions:

Running tests/checks

To run all tests at once, from the top-level folder:

./ninja check

(tools\ninja check on Windows).

You can also run specific checks. For example, if you see during the checks
that check:svelte:editor is failing, you can use ./ninja check:svelte:editor

Looking at the code, I figured out the target for rust tests would be ninja check:rust_test, but after the first build, running it takes 60 seconds:

# ninja check:rust_test
    Finished dev [unoptimized + debuginfo] target(s) in 1.17s
[2/2; 1 active; 61.140s] check:rust_test

Build succeeded.

The output looks like it was built in 1 second and took 60 seconds running tests. How can I tell ninja only to run a single test file? For example, if I am creating a new test inside the file anki/rslib/src/card_rendering/, how could I only run the tests for that file instead of all rust code tests?

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Building the Rust tests will depend on the speed of your machine - I see about 8s here for a no-change build:

dae@dtop:code/desktop/anki% ./ninja check:rust_test
    Finished dev [unoptimized + debuginfo] target(s) in 0.10s
[2/2; 1 active; 8.080s] check:rust_test

You can save a bit of time by invoking cargo directly, which avoids rebuilding the Python library.

dae@dtop:code/desktop/anki% time cargo test -p anki > /dev/null
   Compiling anki v0.0.0 (/home/dae/Work/code/desktop/anki/rslib)
    Finished test [unoptimized + debuginfo] target(s) in 3.53s
     Running unittests src/ (/home/dae/Local/rust/debug/deps/anki-0afea6626d330407)
   Doc-tests anki
cargo test -p anki > /dev/null  8.14s user 13.04s system 405% cpu 5.222 total

You can also do that by running a unit test inside VS Code with the play button.

1 Like

Thanks. I will try that next time I need to run rust tests and report here if I find how to improve performance.

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