Assert CLI

Test CLI Applications - This crate checks the output of a child process is as expected.

Install

For your tests, add it to your Cargo.toml:

[dev-dependencies]
assert_cli = "0.5"

Example

Here's a trivial example:

extern crate assert_cli;

fn main() {
    assert_cli::Assert::main_binary().unwrap();
}

And here is one that will fail (and demonstrates running arbitrary commands):

extern crate assert_cli;

fn main() {
    assert_cli::Assert::command(&["ls", "foo-bar-foo"])
        .fails()
        .and()
        .stderr().contains("foo-bar-foo")
        .unwrap();
}

If you want to match the program's output exactly, you can use stdout().is (and shows the macro form of command):

#[macro_use] extern crate assert_cli;

fn main() {
    assert_cmd!(wc "README.md")
        .stdout().is("1337 README.md")
        .unwrap();
}

... which has the benefit to show a nice, colorful diff in your terminal, like this:

-1337
+92

Tip: Enclose arguments in the assert_cmd! macro in quotes ", if there are special characters, which the macro doesn't accept, e.g. assert_cmd!(cat "foo.txt").

Assert Cli use Environment underneath to deal with environment variables.

More detailed information is available in the documentation. :-)

Relevant crates

Other crates that might be useful in testing command line programs.

• dir-diff for testing file side-effects.
• tempfile for scratchpad directories.
• duct for orchestrating multiple processes.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.