zuzu-rust 0.6.0

Rust implementation of ZuzuScript
Documentation 
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from test/more import *;

requires_capability( "proc" );

from std/proc import Proc, Env, sleep;
from std/time import Time;
let pid := Proc.pid();
ok( pid > 1, "pid returns positive process id", );
let env_name := "ZUZU_STD_PROC_TEST";
Env.remove(env_name);
is( Env.get(env_name), null, "Env.get returns null for unset values", );
is( Env.get( env_name, "fallback" ), "fallback", "Env.get uses default for unset values", );
Env.set( env_name, "hello-world" );
is( Env.get(env_name), "hello-world", "Env.set writes environment values", );
Env.remove(env_name);
is( Env.get(env_name), null, "Env.remove clears environment values", );
let signal_hits := 0;
Proc.onsignal( "USR1", function() {
	signal_hits++;
}
);
is( Proc.kill( "USR1", Proc.pid() ), 1, "kill reports one signalled process", );
let spin := 0;
while ( signal_hits == 0 and spin < 1000 ) {
	spin++;
}
is( signal_hits > 0, 1, "onsignal callback runs" );
let run_ok := { exit_code: 0, signal: 0, error: null };
is( Proc.is_success(run_ok), 1, "is_success identifies successful runs", );
is( Proc.status_text(run_ok), "exit 0", "status_text describes successful exit", );
sleep( 1 / 10 );
pass( "sleep accepts fractional seconds", );
let before := new Time();
sleep(2);
let after := new Time();
ok(
	after.epoch() - before.epoch() >= 2,
	"sleep delays execution for at least two seconds",
);
done_testing();