Struct Assert 

pub struct Assert { /* private fields */ }

Assertions for a specific command.

Implementations

impl Assert

pub fn main_binary() -> Self

Run the crate’s main binary.

Defaults to asserting successful execution.

pub fn cargo_binary<S: AsRef<OsStr>>(name: S) -> Self

Run a specific binary of the current crate.

Defaults to asserting successful execution.

pub fn example<S: AsRef<OsStr>>(name: S) -> Self

Run a specific example of the current crate.

Defaults to asserting successful execution.

pub fn command<S: AsRef<OsStr>>(cmd: &[S]) -> Self

Run a custom command.

Defaults to asserting successful execution.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["echo", "1337"])
    .unwrap();

pub fn with_args<S: AsRef<OsStr>>(self, args: &[S]) -> Self

Add arguments to the command.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["echo"])
    .with_args(&["42"])
    .stdout().contains("42")
    .unwrap();

pub fn stdin<S: Into<Vec<u8>>>(self, contents: S) -> Self

Add stdin to the command.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat"])
    .stdin("42")
    .stdout().contains("42")
    .unwrap();

pub fn current_dir<P: Into<PathBuf>>(self, dir: P) -> Self

Sets the working directory for the command.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["wc", "lib.rs"])
    .current_dir(std::path::Path::new("src"))
    .stdout().contains("lib.rs")
    .execute()
    .unwrap();

pub fn with_env<E: Into<Environment>>(self, env: E) -> Self

Sets environments variables for the command.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["printenv"])
    .with_env(&[("TEST_ENV", "OK")])
    .stdout().contains("TEST_ENV=OK")
    .execute()
    .unwrap();

let env = assert_cli::Environment::empty()
    .insert("FOO", "BAR");

assert_cli::Assert::command(&["printenv"])
    .with_env(&env)
    .stdout().is("FOO=BAR")
    .execute()
    .unwrap();

::std::env::set_var("BAZ", "BAR");

assert_cli::Assert::command(&["printenv"])
    .stdout().contains("BAZ=BAR")
    .execute()
    .unwrap();

pub fn and(self) -> Self

Small helper to make chains more readable.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat", "non-existing-file"])
    .fails()
    .and()
    .stderr().contains("non-existing-file")
    .unwrap();

pub fn succeeds(self) -> Self

Expect the command to be executed successfully.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["echo", "42"])
    .succeeds()
    .unwrap();

pub fn fails(self) -> Self

Expect the command to fail.

Note: This does not include shell failures like command not found. I.e. the command must run and fail for this assertion to pass.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat", "non-existing-file"])
    .fails()
    .and()
    .stderr().contains("non-existing-file")
    .unwrap();

pub fn fails_with(self, expect_exit_code: i32) -> Self

Expect the command to fail and return a specific error code.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat", "non-existing-file"])
    .fails_with(1)
    .and()
    .stderr().is("cat: non-existing-file: No such file or directory")
    .unwrap();

pub fn ignore_status(self) -> Self

Do not care whether the command exits successfully or if it fails.

This function removes any assertions that were already set, including any expected exit code that was set with fails_with.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat", "non-existing-file"])
    .ignore_status()
    .and()
    .stderr().is("cat: non-existing-file: No such file or directory")
    .unwrap();

pub fn stdout(self) -> OutputAssertionBuilder

Create an assertion for stdout’s contents

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["echo", "42"])
    .stdout().contains("42")
    .unwrap();

pub fn stderr(self) -> OutputAssertionBuilder

Create an assertion for stdout’s contents

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["cat", "non-existing-file"])
    .fails_with(1)
    .and()
    .stderr().is("cat: non-existing-file: No such file or directory")
    .unwrap();

pub fn execute(self) -> Result<(), AssertionError>

Execute the command and check the assertions.

Examples

extern crate assert_cli;

let test = assert_cli::Assert::command(&["echo", "42"])
    .stdout().contains("42")
    .execute();
assert!(test.is_ok());

pub fn unwrap(self)

Execute the command, check the assertions, and panic when they fail.

Examples

extern crate assert_cli;

assert_cli::Assert::command(&["echo", "42"])
    .fails()
    .unwrap(); // panics

Trait Implementations

impl Debug for Assert

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Assert

fn default() -> Self

Construct an assert using cargo run -- as command.

Defaults to asserting successful execution.