Crate cargo_test_support

Cargo test support.

See https://rust-lang.github.io/cargo/contrib/ for a guide on writing tests.

There are two places you can find API documentation

• https://docs.rs/cargo-test-support: targeted at external tool developers testing cargo-related code
  • Released with every rustc release
• https://doc.rust-lang.org/nightly/nightly-rustc/cargo_test_support: targeted at cargo contributors
  • Updated on each update of the cargo submodule in rust-lang/rust

This crate is maintained by the Cargo team, primarily for use by Cargo and not intended for external use. This crate may make major changes to its APIs or be deprecated without warning.

Example

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::project;

#[cargo_test]
fn some_test() {
    let p = project()
        .file("src/main.rs", r#"fn main() { println!("hi!"); }"#)
        .build();

    p.cargo("run --bin foo")
        .with_stderr_data(str![[r#"
[COMPILING] foo [..]
[FINISHED] [..]
[RUNNING] `target/debug/foo`
"#]])
        .with_stdout_data(str![["hi!"]])
        .run();
}

Modules

• compare
  Routines for comparing and diffing output.
• containers
  Support for testing using Docker containers.
• cross_compile
  Support for cross-compile tests with the --target flag.
• diff 🔒
  A simple Myers diff implementation.
• git
  Git Testing Support
• install
  Helpers for testing cargo install
• paths
  Access common paths and manipulate the filesystem
• prelude
• publish
  Helpers for testing cargo package / cargo publish
• registry
  Interact with the TestRegistry
• tools
  Common executables that can be reused by various tests.

Macros

• file
  Declare an expected value for an assert from a file
• str
  Declare an expected value from within Rust source
• t
  Unwrap a Result with a useful panic message

Structs

• Execs
  Run and verify a ProcessBuilder
• FileBuilder 🔒
• ProcessBuilder
  A builder object for an external process, similar to std::process::Command.
• Project
  A cargo project to run tests against.
• ProjectBuilder
  Create a project to run tests against
• RawOutput 🔒
  This is the raw output from the process.
• RustcInfo 🔒
• SymlinkBuilder 🔒

Traits

• ArgLineCommandExt
  Add a list of arguments as a line
• CargoCommandExt
  Test the cargo command
• ChannelChangerCommandExt
  Enable nightly features for testing
• TestEnvCommandExt
  Establish a process’s test environment

Functions

• _process 🔒
• assert_deps
• assert_deps_contains
• basic_bin_manifest
  Generate a Cargo.toml with the specified bin.name
• basic_lib_manifest
  Generate a Cargo.toml with the specified lib.name
• basic_manifest
  Generate a basic Cargo.toml
• cargo_exe
  Path to the cargo binary
• cargo_process
  Run cargo $arg_line, see Execs
• execs
  Run and verify a process, see Execs
• git_process
  Run git $arg_line, see ProcessBuilder
• is_coarse_mtime
  Returns true if the local filesystem has low-resolution mtimes.
• is_nightly
• main_file
  Generate a main.rs printing the specified text
• no_such_file_err_msg
  The error message for ENOENT.
• panic_error
  panic!, reporting the specified error , see also t!
• process
  Run $bin in the test’s environment, see ProcessBuilder
• project
  Generates a project layout, see ProjectBuilder
• project_in
  Generates a project layout in given directory, see ProjectBuilder
• project_in_home
  Generates a project layout inside our fake home dir, see ProjectBuilder
• retry
  Helper to retry a function n times.
• rustc_host
  The rustc host such as x86_64-unknown-linux-gnu.
• rustc_host_env
  The host triple suitable for use in a cargo environment variable (uppercased).
• rustc_info 🔒
• sleep_ms
• slow_cpu_multiplier
  Some CI setups are much slower then the equipment used by Cargo itself. Architectures that do not have a modern processor, hardware emulation, etc. This provides a way for those setups to increase the cut off for all the time based test.
• symlink_supported
• thread_wait_timeout
  Helper that waits for a thread to finish, up to n tenths of a second.
• threaded_timeout
  Helper that runs some function, and waits up to n tenths of a second for it to finish.

Attribute Macros

• cargo_test
  Replacement for #[test]