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cargo-nextest 0.9.44
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@github-actions github-actions released this 23 Nov 20:30
· 1740 commits to main since this release
cargo-nextest-0.9.44
fb18c26

Added

Double-spawning test processes

On Unix platforms, a new experimental "double-spawn" approach to running test binaries has been added. With the double-spawn approach, when listing or running tests, nextest will no longer spawn test processes directly. Instead, nextest will first spawn a copy of itself, which will do some initial setup work and then exec the test process.

The double-spawn approach is currently disabled by default. It can be enabled by setting NEXTEST_EXPERIMENTAL_DOUBLE_SPAWN=1 in your environment.

The double-spawn approach will soon be enabled the default.

Pausing and resuming test runs

Nextest now has initial support for handling SIGTSTP (Ctrl-Z) and SIGCONT (fg). On SIGTSTP (e.g. when Ctrl-Z is pressed), all running tests and timers are paused, and nextest is suspended. On SIGCONT (e.g. when fg is run), tests and timers are resumed.

Note that, by default, pressing Ctrl-Z in the middle of a test run can lead to nextest runs hanging sometimes. These nondeterministic hangs will not happen if both of the following are true:

  • Nextest is built with Rust 1.66 (currently in beta) or above. Rust 1.66 contains a required fix to upstream Rust.

    Note that the pre-built binaries for this version are built with beta Rust to pick this fix up.

  • The double-spawn approach is enabled (see above) with NEXTEST_EXPERIMENTAL_DOUBLE_SPAWN=1.

Call for testing: Please try out the double-spawn approach by setting NEXTEST_EXPERIMENTAL_DOUBLE_SPAWN=1 in your environment. It has been extensively tested and should not cause any breakages, but if it does, please report an issue. Thank you!

Fixed

  • Fixed an issue with nextest hanging on Windows with spawned processes that outlive the test (#656). Thanks to Chip Senkbeil for reporting it and providing a minimal example!
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