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Add some contributor docs for debugging testsuite tests. #9904

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Sep 13, 2021
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Add some contributor docs for debugging testsuite tests. #9904

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29 changes: 29 additions & 0 deletions src/doc/contrib/src/tests/writing.md
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Expand Up @@ -123,10 +123,39 @@ If you need to test with registry dependencies, see
If you need to test git dependencies, see [`support::git`] to create a git
dependency.

## Debugging tests

In some cases, you may need to dig into a test that is not working as you
expect, or you just generally want to experiment within the sandbox
environment. The general process is:

1. Build the sandbox for the test you want to investigate. For example:

`cargo test --test testsuite -- features2::inactivate_targets`.
2. In another terminal, head into the sandbox directory to inspect the files and run `cargo` directly.
1. The sandbox directories start with `t0` for the first test.

`cd target/tmp/cit/t0`
2. Set up the environment so that the sandbox configuration takes effect:

`export CARGO_HOME=$(pwd)/home/.cargo`
3. Most tests create a `foo` project, so head into that:

`cd foo`
3. Run whatever cargo command you want. See [Running Cargo] for more details
on running the correct `cargo` process. Some examples:

* `/path/to/my/cargo/target/debug/cargo check`
* Using a debugger like `lldb` or `gdb`:
1. `lldb /path/to/my/cargo/target/debug/cargo`
2. Set a breakpoint, for example: `b generate_targets`
3. Run with arguments: `r check`

[`testsuite`]: https://github.com/rust-lang/cargo/tree/master/tests/testsuite/
[`ProjectBuilder`]: https://github.com/rust-lang/cargo/blob/e4b65bdc80f2a293447f2f6a808fa7c84bf9a357/crates/cargo-test-support/src/lib.rs#L225-L231
[`Execs`]: https://github.com/rust-lang/cargo/blob/e4b65bdc80f2a293447f2f6a808fa7c84bf9a357/crates/cargo-test-support/src/lib.rs#L558-L579
[`support`]: https://github.com/rust-lang/cargo/blob/master/crates/cargo-test-support/src/lib.rs
[`support::compare`]: https://github.com/rust-lang/cargo/blob/master/crates/cargo-test-support/src/compare.rs
[`support::registry::Package`]: https://github.com/rust-lang/cargo/blob/e4b65bdc80f2a293447f2f6a808fa7c84bf9a357/crates/cargo-test-support/src/registry.rs#L73-L149
[`support::git`]: https://github.com/rust-lang/cargo/blob/master/crates/cargo-test-support/src/git.rs
[Running Cargo]: ../process/working-on-cargo.md#running-cargo