Auto merge of #11901 - jofas:fix-for-11852, r=weihanglo

Documented working directory behaviour for `cargo test`, `cargo bench` and `cargo run`

Fixes #11852. Updated the respective man-pages of `cargo test`, `cargo bench` and `cargo run` to include the information of the working directory of the executables. Added a comment in the code of `cargo run`  where the default behaviour (the package's root directory) is overridden.

Author: bors

src/cargo/ops/cargo_run.rs

@@ -93,6 +93,11 @@ pub fn run(
     };
     let pkg = bins[0].0;
     let mut process = compile.target_process(exe, unit.kind, pkg, *script_meta)?;
+
+    // Sets the working directory of the child process to the current working
+    // directory of the parent process.
+    // Overrides the default working directory of the `ProcessBuilder` returned
+    // by `compile.target_process` (the package's root directory)
     process.args(args).cwd(config.cwd());
 
     config.shell().status("Running", process.to_string())?;

src/doc/man/cargo-bench.md

@@ -56,6 +56,14 @@ debugger.
 
 [`bench` profile]: ../reference/profiles.html#bench
 
+### Working directory of benchmarks
+
+The working directory of every benchmark is set to the root directory of the 
+package the benchmark belongs to.
+Setting the working directory of benchmarks to the package's root directory 
+makes it possible for benchmarks to reliably access the package's files using 
+relative paths, regardless from where `cargo bench` was executed from.
+
 ## OPTIONS
 
 ### Benchmark Options

src/doc/man/cargo-run.md

@@ -17,6 +17,10 @@ All the arguments following the two dashes (`--`) are passed to the binary to
 run. If you're passing arguments to both Cargo and the binary, the ones after
 `--` go to the binary, the ones before go to Cargo.
 
+Unlike {{man "cargo-test" 1}} and {{man "cargo-bench" 1}}, `cargo run` sets the 
+working directory of the binary executed to the current working directory, same 
+as if it was executed in the shell directly.
+
 ## OPTIONS
 
 {{> section-options-package }}

src/doc/man/cargo-test.md

@@ -57,6 +57,14 @@ and may change in the future; beware of depending on it.
 See the [rustdoc book](https://doc.rust-lang.org/rustdoc/) for more information
 on writing doc tests.
 
+### Working directory of tests
+
+The working directory of every test is set to the root directory of the package 
+the test belongs to.
+Setting the working directory of tests to the package's root directory makes it 
+possible for tests to reliably access the package's files using relative paths,
+regardless from where `cargo test` was executed from.
+
 ## OPTIONS
 
 ### Test Options

src/doc/man/generated_txt/cargo-bench.txt

@@ -49,6 +49,13 @@ DESCRIPTION
        switch to the dev profile. You can then run the debug-enabled benchmark
        within a debugger.
 
+   Working directory of benchmarks
+       The working directory of every benchmark is set to the root directory of
+       the package the benchmark belongs to. Setting the working directory of
+       benchmarks to the package’s root directory makes it possible for
+       benchmarks to reliably access the package’s files using relative
+       paths, regardless from where cargo bench was executed from.
+
 OPTIONS
    Benchmark Options
        --no-run

src/doc/man/generated_txt/cargo-run.txt

@@ -13,6 +13,10 @@ DESCRIPTION
        to run. If you’re passing arguments to both Cargo and the binary, the
        ones after -- go to the binary, the ones before go to Cargo.
 
+       Unlike cargo-test(1) and cargo-bench(1), cargo run sets the working
+       directory of the binary executed to the current working directory, same
+       as if it was executed in the shell directly.
+
 OPTIONS
    Package Selection
        By default, the package in the current working directory is selected.

src/doc/man/generated_txt/cargo-test.txt

@@ -52,6 +52,13 @@ DESCRIPTION
        See the rustdoc book <https://doc.rust-lang.org/rustdoc/> for more
        information on writing doc tests.
 
+   Working directory of tests
+       The working directory of every test is set to the root directory of the
+       package the test belongs to. Setting the working directory of tests to
+       the package’s root directory makes it possible for tests to reliably
+       access the package’s files using relative paths, regardless from where
+       cargo test was executed from.
+
 OPTIONS
    Test Options
        --no-run

src/doc/src/commands/cargo-bench.md

@@ -56,6 +56,14 @@ debugger.
 
 [`bench` profile]: ../reference/profiles.html#bench
 
+### Working directory of benchmarks
+
+The working directory of every benchmark is set to the root directory of the 
+package the benchmark belongs to.
+Setting the working directory of benchmarks to the package's root directory 
+makes it possible for benchmarks to reliably access the package's files using 
+relative paths, regardless from where `cargo bench` was executed from.
+
 ## OPTIONS
 
 ### Benchmark Options

src/doc/src/commands/cargo-run.md

@@ -17,6 +17,10 @@ All the arguments following the two dashes (`--`) are passed to the binary to
 run. If you're passing arguments to both Cargo and the binary, the ones after
 `--` go to the binary, the ones before go to Cargo.
 
+Unlike [cargo-test(1)](cargo-test.html) and [cargo-bench(1)](cargo-bench.html), `cargo run` sets the 
+working directory of the binary executed to the current working directory, same 
+as if it was executed in the shell directly.
+
 ## OPTIONS
 
 ### Package Selection

src/doc/src/commands/cargo-test.md

@@ -57,6 +57,14 @@ and may change in the future; beware of depending on it.
 See the [rustdoc book](https://doc.rust-lang.org/rustdoc/) for more information
 on writing doc tests.
 
+### Working directory of tests
+
+The working directory of every test is set to the root directory of the package 
+the test belongs to.
+Setting the working directory of tests to the package's root directory makes it 
+possible for tests to reliably access the package's files using relative paths,
+regardless from where `cargo test` was executed from.
+
 ## OPTIONS
 
 ### Test Options