macro_rules! assert_command_stderr_eq_expr { ($a_command:expr, $b_expr:expr $(,)?) => { ... }; ($a_command:expr, $b_expr:expr, $($message:tt)+) => { ... }; }
Expand description
Assert a command stderr string is equal to an expression.
-
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 command = Command::new("bin/printf-stderr");
command.args(["%s", "hello"]);
let s = String::from("hello");
assert_command_stderr_eq_expr!(command, s);
//-> ()
// Panic with error message
let result = panic::catch_unwind(|| {
let mut command = Command::new("bin/printf-stderr");
command.args(["%s", "hello"]);
let s = String::from("zzz");
assert_command_stderr_eq_expr!(command, s);
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = concat!(
"assertion failed: `assert_command_stderr_eq_expr!(left_command, right_expr)`\n",
" left_command label: `command`,\n",
" left_command debug: `\"bin/printf-stderr\" \"%s\" \"hello\"`,\n",
" right_expr label: `s`,\n",
" right_expr debug: `\"zzz\"`,\n",
" left: `\"hello\"`,\n",
" right: `\"zzz\"`"
);
assert_eq!(actual, expect);
// Panic with custom message
let result = panic::catch_unwind(|| {
let mut command = Command::new("bin/printf-stderr");
command.args(["%s", "hello"]);
let s = String::from("zzz");
assert_command_stderr_eq_expr!(command, s, "message");
//-> panic!
});
assert!(result.is_err());
let actual = result.unwrap_err().downcast::<String>().unwrap().to_string();
let expect = "message";
assert_eq!(actual, expect);