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use chrono::offset::TimeZone;
use chrono::Local;
use chrono::{Datelike, NaiveDate, NaiveDateTime, Timelike};
use std::{path, process};
#[cfg(unix)]
fn verify_against_date_command_local(path: &'static str, dt: NaiveDateTime) {
let output = process::Command::new(path)
.arg("-d")
.arg(format!("{}-{:02}-{:02} {:02}:05:01", dt.year(), dt.month(), dt.day(), dt.hour()))
.arg("+%Y-%m-%d %H:%M:%S %:z")
.output()
.unwrap();
let date_command_str = String::from_utf8(output.stdout).unwrap();
// The below would be preferred. At this stage neither earliest() or latest()
// seems to be consistent with the output of the `date` command, so we simply
// compare both.
// let local = Local
// .with_ymd_and_hms(year, month, day, hour, 5, 1)
// // looks like the "date" command always returns a given time when it is ambiguous
// .earliest();
// if let Some(local) = local {
// assert_eq!(format!("{}\n", local), date_command_str);
// } else {
// // we are in a "Spring forward gap" due to DST, and so date also returns ""
// assert_eq!("", date_command_str);
// }
// This is used while a decision is made wheter the `date` output needs to
// be exactly matched, or whether LocalResult::Ambigious should be handled
// differently
let date = NaiveDate::from_ymd_opt(dt.year(), dt.month(), dt.day()).unwrap();
match Local.from_local_datetime(&date.and_hms_opt(dt.hour(), 5, 1).unwrap()) {
chrono::LocalResult::Ambiguous(a, b) => assert!(
format!("{}\n", a) == date_command_str || format!("{}\n", b) == date_command_str
),
chrono::LocalResult::Single(a) => {
assert_eq!(format!("{}\n", a), date_command_str);
}
chrono::LocalResult::None => {
assert_eq!("", date_command_str);
}
}
}
#[test]
#[cfg(unix)]
fn try_verify_against_date_command() {
let date_path = "/usr/bin/date";
if !path::Path::new(date_path).exists() {
// date command not found, skipping
// avoid running this on macOS, which has path /bin/date
// as the required CLI arguments are not present in the
// macOS build.
return;
}
let mut date = NaiveDate::from_ymd_opt(1975, 1, 1).unwrap().and_hms_opt(0, 0, 0).unwrap();
while date.year() < 2078 {
if (1975..=1977).contains(&date.year())
|| (2020..=2022).contains(&date.year())
|| (2073..=2077).contains(&date.year())
{
verify_against_date_command_local(date_path, date);
}
date += chrono::Duration::hours(1);
}
}
#[cfg(target_os = "linux")]
fn verify_against_date_command_format_local(path: &'static str, dt: NaiveDateTime) {
let required_format =
"d%d D%D F%F H%H I%I j%j k%k l%l m%m M%M S%S T%T u%u U%U w%w W%W X%X y%y Y%Y z%:z";
// a%a - depends from localization
// A%A - depends from localization
// b%b - depends from localization
// B%B - depends from localization
// h%h - depends from localization
// c%c - depends from localization
// p%p - depends from localization
// r%r - depends from localization
// x%x - fails, date is dd/mm/yyyy, chrono is dd/mm/yy, same as %D
// Z%Z - too many ways to represent it, will most likely fail
let output = process::Command::new(path)
.arg("-d")
.arg(format!(
"{}-{:02}-{:02} {:02}:{:02}:{:02}",
dt.year(),
dt.month(),
dt.day(),
dt.hour(),
dt.minute(),
dt.second()
))
.arg(format!("+{}", required_format))
.output()
.unwrap();
let date_command_str = String::from_utf8(output.stdout).unwrap();
let date = NaiveDate::from_ymd_opt(dt.year(), dt.month(), dt.day()).unwrap();
let ldt = Local
.from_local_datetime(&date.and_hms_opt(dt.hour(), dt.minute(), dt.second()).unwrap())
.unwrap();
let formated_date = format!("{}\n", ldt.format(required_format));
assert_eq!(date_command_str, formated_date);
}
#[test]
#[cfg(target_os = "linux")]
fn try_verify_against_date_command_format() {
let date_path = "/usr/bin/date";
if !path::Path::new(date_path).exists() {
// date command not found, skipping
return;
}
let mut date = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_opt(12, 11, 13).unwrap();
while date.year() < 2008 {
verify_against_date_command_format_local(date_path, date);
date += chrono::Duration::days(55);
}
}
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