Expand description
Assert a command stdout string contains a given containee.
Pseudocode:
(command ⇒ stdout ⇒ string) contains (expr into string)
§Example
use assertables::*;
use std::process::Command;
let mut command = Command::new("bin/printf-stdout");
command.args(["%s", "alfa"]);
let containee = "lf";
assert_command_stdout_string_contains!(command, &containee);