Macro assertables::assert_command_stderr_eq_other

source · 
macro_rules! assert_command_stderr_eq_other {
    ($a_command:expr, $b_command:expr $(,)?) => { ... };
    ($a_command:expr, $b_command:expr, $($message:tt)+) => { ... };
}
Expand description

Assert a command stderr string is equal to another.

  • If true, return ().

  • Otherwise, call panic! with a message and the values of the expressions with their debug representations.

Examples

use std::process::Command;

// Return Ok
let mut a = Command::new("printf");
let mut b = Command::new("printf");
assert_command_stderr_eq_other!(a, b);
//-> ()

// Panic with error message
let result = panic::catch_unwind(|| {
let mut a = Command::new("printf");
let mut b = Command::new("printf");
b.arg("-v");
assert_command_stderr_eq_other!(a, b);
//-> panic!("…")
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
    "assertion failed: `assert_command_stderr_eq_other!(left_command, right_command)`\n",
    "  left_command label: `a`,\n",
    "  left_command debug: `\"printf\"`,\n",
    " right_command label: `b`,\n",
    " right_command debug: `\"printf\" \"-v\"`,\n",
    "                left: `\"usage: printf format [arguments ...]\\n\"`,\n",
    "               right: `\"printf: illegal option -- v\\nusage: printf format [arguments ...]\\n\"`"
);
assert_eq!(actual, expect);

// Panic with error message
let result = panic::catch_unwind(|| {
let mut a = Command::new("printf");
let mut b = Command::new("printf");
b.arg("-v");
assert_command_stderr_eq_other!(a, b, "message");
//-> panic!("…")
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = "message";
assert_eq!(actual, expect);