Expand description
Assert a command (built with program and args) stderr string is equal to an expression.
Pseudocode:
(program1 + args1 ⇒ command ⇒ stderr ⇒ string) = (expr into string)
§Example
let program = "bin/printf-stderr";
let args = ["%s", "hello"];
let s = String::from("hello");
assert_program_args_stderr_eq_expr!(&program, &args, s);