qubit-clock 0.3.0

Thread-safe clock abstractions for Rust: monotonic clocks, mock testing, high-precision time meters, and timezone support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026 Haixing Hu.
 *
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    Licensed under the Apache License, Version 2.0.
 *
 ******************************************************************************/
//! Behavior-focused tests for the `MockClock` type.

use chrono::{
    DateTime,
    Utc,
};
use qubit_clock::{
    Clock,
    ControllableClock,
    MockClock,
};

/// Parses a fixed UTC timestamp used by mock-clock behavior tests.
fn fixed_time(value: &str) -> DateTime<Utc> {
    DateTime::parse_from_rfc3339(value)
        .expect("fixed test timestamp should parse")
        .with_timezone(&Utc)
}

#[test]
fn test_mock_clock_set_time_clears_auto_advance() {
    let clock = MockClock::new();
    let initial_time = fixed_time("2024-01-01T00:00:00Z");
    let replacement_time = fixed_time("2024-02-01T00:00:00Z");

    clock.set_time(initial_time);
    clock.set_auto_advance_millis(250);
    assert_eq!(clock.millis(), initial_time.timestamp_millis());
    assert_eq!(clock.millis(), initial_time.timestamp_millis() + 250);

    clock.set_time(replacement_time);

    let first_read = clock.millis();
    let second_read = clock.millis();
    assert_eq!(first_read, replacement_time.timestamp_millis());
    assert!(
        second_read - first_read < 10,
        "set_time should disable auto-advance, diff: {}",
        second_read - first_read
    );
}

#[test]
fn test_mock_clock_clone_shares_manual_adjustments() {
    let clock = MockClock::new();
    let cloned = clock.clone();
    let initial_time = fixed_time("2024-03-01T00:00:00Z");

    clock.set_time(initial_time);
    cloned.advance_millis(1_500);

    assert_eq!(clock.millis(), initial_time.timestamp_millis() + 1_500);
    assert_eq!(cloned.millis(), clock.millis());
}

#[test]
fn test_mock_clock_negative_auto_advance_moves_backward_per_read() {
    let clock = MockClock::new();
    let initial_time = fixed_time("2024-04-01T00:00:00Z");

    clock.set_time(initial_time);
    clock.set_auto_advance_millis(-100);

    let first_read = clock.millis();
    let second_read = clock.millis();
    let third_read = clock.millis();

    assert_eq!(first_read, initial_time.timestamp_millis());
    assert_eq!(second_read, initial_time.timestamp_millis() - 100);
    assert_eq!(third_read, initial_time.timestamp_millis() - 200);
}