test-with

A lib help you run test with conditions, else the test will be ignored with clear message. Also, you can easiler run test with customed test environment or mock service.

Introduction

It is good to use this crate in dev dependency as following

[dev-dependencies]
test-with = "*"

If you want the dependency smaller with a shorter compiling time, you can disable default features and use specific one. For example, if you only checking a remote web server, you can use the net or http feature as the following.

[dev-dependencies]
test-with = { version = "*", default-features = false, features = ["http"] }

The features you can use are net(http, icmp), resource, user, executable.

Currently, the condition is checked on build-time not runtime and not perfect and good for most develop scenario, because of this issue of rust-lang. Here are slides@COSCUP and slides@COSCON to help you know more about it. If you really want to check the condition in runtime, please check runtime section. The runtime feature and runtime macros (test_with::runner!, #[test_with::module], #[test_with::runtime_env()]) can help you run the test and check the conditions in runtime. Also, the customed test environment or mock service can set with the modules with runtime feature.

If you forget to add #[test] flag on the test case, #[test_with] macro will add it for you.

Rust version 1.61 of stable channel or 2022-03-30 of nightly channel will show the ignore message. If the ignore message does not show in the previous Rust version you used, the feature ign-msg can be used to work around. and the name of ignored test case will be rewritten, such that you can easier to know why the test is ignored.

The order of test macros(#[test], #[tokio::test], #[serial_test::serial], ...) is important, please check out examples.

Environment Variable

Run test case when the environment variable is set.

// PWD environment variable exists
#[test_with::env(PWD)]
#[test]
fn test_works() {
    assert!(true);
}

// NOTHING environment variable does not exist
#[test_with::env(NOTHING)]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

Result of cargo test

running 2 tests
test tests::test_ignored ... ignored, because following variable not found: NOTHING
test tests::test_works ... ok

test result: ok. 1 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s

Or run all test cases for test module when the environment variable is set.

#[test_with::env(PWD)]
#[cfg(test)]
mod tests {

    #[test]
    fn test_works() {
        assert!(true);
    }
}

If the test depends on more than one environment variables, you can write it with multiple variables, #[test_with::env(VAR1, VAR2)].

Also, the test case can be ignored with the specific environment variable.

// The test will be ignored in Github actions.
#[test_with::no_env(GITHUB_ACTIONS)]
#[test]
fn test_ignore_in_github_action() {
    println!("Should be ignored in GITHUB_ACTION");
}

File/Folder

Run test case when the file or folder exist. This is good for testing with database config. If you want to check the folder exist or not, please use path.

// hostname exists
#[test_with::file(/etc/hostname)]
#[test]
fn test_works() {
    assert!(true);
}

// nothing file does not exist
#[test_with::file(/etc/nothing)]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

// etc exists
#[test_with::path(/etc)]
#[test]
fn test_works_for_path() {
    assert!(true);
}

If the test depends on more than one file or path, you can write it with multiple file/path, #[test_with::file(/file1, /file2)] or #[test_with::path(/folder, /file)].

Http/Https Service

Run test case when the http/https service available. This is good for integration testing. Require http feature, if default features are disabled.

// https service exists
#[test_with::https(www.rust-lang.org)]
#[test]
fn test_works() {
    assert!(true);
}

// There is no not.exist.com
#[test_with::https(not.exist.com)]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

If the test depends on more than one service, you can write it with multiple service, #[test_with::http(service1, service2)] or #[test_with::http2(service1, service2)].

TCP socket

Run integration test case when the remote tcp socket is listening.

#[test_with::tcp(8.8.8.8:53)]
#[test]
fn test_works() {
    assert!(true);
}

#[test_with::tcp(193.194.195.196)]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

Remote Server Online Status

Run integration test case when the remote server online. Please note the user running test case should have capability to open socket. Require icmp feature, if default features are disabled.

// localhost is online
#[test_with::icmp(127.0.0.1)]
#[test]
fn test_works() {
    assert!(true);
}

// 193.194.195.196 is offline
#[test_with::icmp(193.194.195.196)]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

User/Group condition

Run integration test case when the user is specific user or in specific group Require user feature, if default features are disabled.

#[test_with::root()]
#[test]
fn test_ignored() {
    panic!("should be ignored")
}

#[test_with::group(avengers)]
#[test]
fn test_ignored2() {
    panic!("should be ignored")
}

#[test_with::user(spider)]
#[test]
fn test_ignored3() {
    panic!("should be ignored")
}

CPU/Memory/Swap condition

Run integration test case when the memory/swap is enough Require resource feature, if default features are disabled.

#[test_with::cpu_core(32)]
#[test]
fn test_ignored_by_cpu_core() {
    panic!("should be ignored")
}


#[test_with::phy_core(32)]
#[test]
fn test_ignored_by_physical_cpu_core() {
    panic!("should be ignored")
}

#[test_with::mem(999GB)]
#[test]
fn test_ignored_by_mem() {
    panic!("should be ignored")
}

#[test_with::swap(999GB)]
#[test]
fn test_ignored_by_swap() {
    panic!("should be ignored")
}

Executable condition

Run integration test case when the executables can be accessed Require executable feature, if default features are disabled.

    // `pwd` executable command exists
    #[test_with::executable(pwd)]
    #[test]
    fn test_executable() {
        assert!(true);
    }

    // `/bin/sh` executable exists
    #[test_with::executable(/bin/sh)]
    #[test]
    fn test_executable_with_path() {
        assert!(true);
    }

    // `non` does not exist
    #[test_with::executable(non)]
    #[test]
    fn test_non_existing_executable() {
        panic!("should be ignored")
    }

    // `pwd` and `ls` exist
    #[test_with::executable(pwd, ls)]
    #[test]
    fn test_executables_too() {
        assert!(true);
    }

Runtime

We can let an example to do thing that cargo test runner do, cargo run --example=<example_name>, and ignore testcase in runtime. The testcase of in the example will not in #[cfg(test)] or #[test] anymore, and use #[test_with::runtime_*], the test runner will treat it as the test in Rust and also provide the same summary as cargo test.

The runtime feature should be enabled and include as normal dependency, and also include the libtest-with with corresponding features in Cargo.toml.

test-with = { version = "0.10", features = ["runtime"] }
libtest-with = { version = "0.6.1-6", features = ["net", "resource", "user", "executable"] }

Create an example with the following runtime macros (test_with::runner!, #[test_with::module], #[test_with::runtime_env()]).

test_with::runner!(module_name);

#[test_with::module]
mod module_name {
    #[test_with::runtime_env(PWD)]
    fn test_works() {
    }
}

or you can customized your condition function with runtime_ignore_if

test_with::runner!(custom_mod);

fn something_happened() -> Option<String> {
    Some("because something happened".to_string())
}

#[test_with::module]
mod custom_mod {
    #[test_with::runtime_ignore_if(something_happened)]
    fn test_ignored() {
        assert!(false);
    }
}

There are two ways to setup mock service in the test runner, one is by struct and the other is by type.

test_with::runner!(test_with_mock);

#[test_with::module]
mod test_with_mock {
    pub struct TestEnv {}

    impl Default for TestEnv {
        fn default() -> TestEnv {
            // Set up mock here
            TestEnv {}
        }
    }

    impl Drop for TestEnv {
        fn drop(&mut self) {
            // Tear down mock here
        }
    }
}

or

test_with::runner!(test_with_mock);

pub struct Moc {}

impl Default for Moc {
    fn default() -> Moc {
        // Set up mock here
        Moc {}
    }
}

impl Drop for Moc {
    fn drop(&mut self) {
        // Tear down mock here
    }
}

#[test_with::module]
mod test_with_mock {
    pub type TestEnv = super::Moc;
}

Please check out examples uder the example/runner project.

Relating issues

• Solve this in runtime