Macro assertables::assert_command_stderr_eq

source · 
macro_rules! assert_command_stderr_eq {
    ($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("bin/printf-stderr");
a.args(["%s", "hello"]);
let mut b = Command::new("bin/printf-stderr");
b.args(["%s", "hello"]);
assert_command_stderr_eq!(a, b);
//-> ()

// Panic with error message
let result = panic::catch_unwind(|| {
let mut a = Command::new("bin/printf-stderr");
a.args(["%s", "hello"]);
let mut b = Command::new("bin/printf-stderr");
b.args(["%s", "zzz"]);
assert_command_stderr_eq!(a, b);
//-> panic!("…")
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
    "assertion failed: `assert_command_stderr_eq!(left_command, right_command)`\n",
    "  left_command label: `a`,\n",
    "  left_command debug: `\"bin/printf-stderr\" \"%s\" \"hello\"`,\n",
    " right_command label: `b`,\n",
    " right_command debug: `\"bin/printf-stderr\" \"%s\" \"zzz\"`,\n",
    "                left: `\"hello\"`,\n",
    "               right: `\"zzz\"`"
);
assert_eq!(actual, expect);

// Panic with custom message
let result = panic::catch_unwind(|| {
let mut a = Command::new("bin/printf-stderr");
a.args(["%s", "hello"]);
let mut b = Command::new("bin/printf-stderr");
b.args(["%s", "zzz"]);
assert_command_stderr_eq!(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);