1 files changed, 294 insertions, 0 deletions

diff --git a/rust/clock/tests/clock.rs b/rust/clock/tests/clock.rs
new file mode 100644
index 0000000..04f5241
--- /dev/null
+++ b/rust/clock/tests/clock.rs
@@ -0,0 +1,294 @@
+use clock::Clock;
+
+//
+// Clock Creation
+//
+
+#[test]
+fn test_on_the_hour() {
+    assert_eq!(Clock::new(8, 0).to_string(), "08:00");
+}
+
+#[test]
+fn test_past_the_hour() {
+    assert_eq!(Clock::new(11, 9).to_string(), "11:09");
+}
+
+#[test]
+fn test_midnight_is_zero_hours() {
+    assert_eq!(Clock::new(24, 0).to_string(), "00:00");
+}
+
+#[test]
+fn test_hour_rolls_over() {
+    assert_eq!(Clock::new(25, 0).to_string(), "01:00");
+}
+
+#[test]
+fn test_hour_rolls_over_continuously() {
+    assert_eq!(Clock::new(100, 0).to_string(), "04:00");
+}
+
+#[test]
+fn test_sixty_minutes_is_next_hour() {
+    assert_eq!(Clock::new(1, 60).to_string(), "02:00");
+}
+
+#[test]
+fn test_minutes_roll_over() {
+    assert_eq!(Clock::new(0, 160).to_string(), "02:40");
+}
+
+#[test]
+fn test_minutes_roll_over_continuously() {
+    assert_eq!(Clock::new(0, 1723).to_string(), "04:43");
+}
+
+#[test]
+fn test_hours_and_minutes_roll_over() {
+    assert_eq!(Clock::new(25, 160).to_string(), "03:40");
+}
+
+#[test]
+fn test_hours_and_minutes_roll_over_continuously() {
+    assert_eq!(Clock::new(201, 3001).to_string(), "11:01");
+}
+
+#[test]
+fn test_hours_and_minutes_roll_over_to_exactly_midnight() {
+    assert_eq!(Clock::new(72, 8640).to_string(), "00:00");
+}
+
+#[test]
+fn test_negative_hour() {
+    assert_eq!(Clock::new(-1, 15).to_string(), "23:15");
+}
+
+#[test]
+fn test_negative_hour_roll_over() {
+    assert_eq!(Clock::new(-25, 00).to_string(), "23:00");
+}
+
+#[test]
+fn test_negative_hour_roll_over_continuously() {
+    assert_eq!(Clock::new(-91, 00).to_string(), "05:00");
+}
+
+#[test]
+fn test_negative_minutes() {
+    assert_eq!(Clock::new(1, -40).to_string(), "00:20");
+}
+
+#[test]
+fn test_negative_minutes_roll_over() {
+    assert_eq!(Clock::new(1, -160).to_string(), "22:20");
+}
+
+#[test]
+fn test_negative_minutes_roll_over_continuously() {
+    assert_eq!(Clock::new(1, -4820).to_string(), "16:40");
+}
+
+#[test]
+fn test_negative_sixty_minutes_is_prev_hour() {
+    assert_eq!(Clock::new(2, -60).to_string(), "01:00");
+}
+
+#[test]
+fn test_negative_hour_and_minutes_both_roll_over() {
+    assert_eq!(Clock::new(-25, -160).to_string(), "20:20");
+}
+
+#[test]
+fn test_negative_hour_and_minutes_both_roll_over_continuously() {
+    assert_eq!(Clock::new(-121, -5810).to_string(), "22:10");
+}
+
+#[test]
+fn test_zero_hour_and_negative_minutes() {
+    assert_eq!(Clock::new(0, -22).to_string(), "23:38");
+}
+
+//
+// Clock Math
+//
+
+#[test]
+fn test_add_minutes() {
+    let clock = Clock::new(10, 0).add_minutes(3);
+    assert_eq!(clock.to_string(), "10:03");
+}
+
+#[test]
+fn test_add_no_minutes() {
+    let clock = Clock::new(6, 41).add_minutes(0);
+    assert_eq!(clock.to_string(), "06:41");
+}
+
+#[test]
+fn test_add_to_next_hour() {
+    let clock = Clock::new(0, 45).add_minutes(40);
+    assert_eq!(clock.to_string(), "01:25");
+}
+
+#[test]
+fn test_add_more_than_one_hour() {
+    let clock = Clock::new(10, 0).add_minutes(61);
+    assert_eq!(clock.to_string(), "11:01");
+}
+
+#[test]
+fn test_add_more_than_two_hours_with_carry() {
+    let clock = Clock::new(0, 45).add_minutes(160);
+    assert_eq!(clock.to_string(), "03:25");
+}
+
+#[test]
+fn test_add_across_midnight() {
+    let clock = Clock::new(23, 59).add_minutes(2);
+    assert_eq!(clock.to_string(), "00:01");
+}
+
+#[test]
+fn test_add_more_than_one_day() {
+    let clock = Clock::new(5, 32).add_minutes(1500);
+    assert_eq!(clock.to_string(), "06:32");
+}
+
+#[test]
+fn test_add_more_than_two_days() {
+    let clock = Clock::new(1, 1).add_minutes(3500);
+    assert_eq!(clock.to_string(), "11:21");
+}
+
+#[test]
+fn test_subtract_minutes() {
+    let clock = Clock::new(10, 3).add_minutes(-3);
+    assert_eq!(clock.to_string(), "10:00");
+}
+
+#[test]
+fn test_subtract_to_previous_hour() {
+    let clock = Clock::new(10, 3).add_minutes(-30);
+    assert_eq!(clock.to_string(), "09:33");
+}
+
+#[test]
+fn test_subtract_more_than_an_hour() {
+    let clock = Clock::new(10, 3).add_minutes(-70);
+    assert_eq!(clock.to_string(), "08:53");
+}
+
+#[test]
+fn test_subtract_across_midnight() {
+    let clock = Clock::new(0, 3).add_minutes(-4);
+    assert_eq!(clock.to_string(), "23:59");
+}
+
+#[test]
+fn test_subtract_more_than_two_hours() {
+    let clock = Clock::new(0, 0).add_minutes(-160);
+    assert_eq!(clock.to_string(), "21:20");
+}
+
+#[test]
+fn test_subtract_more_than_two_hours_with_borrow() {
+    let clock = Clock::new(6, 15).add_minutes(-160);
+    assert_eq!(clock.to_string(), "03:35");
+}
+
+#[test]
+fn test_subtract_more_than_one_day() {
+    let clock = Clock::new(5, 32).add_minutes(-1500);
+    assert_eq!(clock.to_string(), "04:32");
+}
+
+#[test]
+fn test_subtract_mores_than_two_days() {
+    let clock = Clock::new(2, 20).add_minutes(-3000);
+    assert_eq!(clock.to_string(), "00:20");
+}
+
+//
+// Test Equality
+//
+
+#[test]
+fn test_compare_clocks_for_equality() {
+    assert_eq!(Clock::new(15, 37), Clock::new(15, 37));
+}
+
+#[test]
+fn test_compare_clocks_a_minute_apart() {
+    assert_ne!(Clock::new(15, 36), Clock::new(15, 37));
+}
+
+#[test]
+fn test_compare_clocks_an_hour_apart() {
+    assert_ne!(Clock::new(14, 37), Clock::new(15, 37));
+}
+
+#[test]
+fn test_compare_clocks_with_hour_overflow() {
+    assert_eq!(Clock::new(10, 37), Clock::new(34, 37));
+}
+
+#[test]
+fn test_compare_clocks_with_hour_overflow_by_several_days() {
+    assert_eq!(Clock::new(3, 11), Clock::new(99, 11));
+}
+
+#[test]
+fn test_compare_clocks_with_negative_hour() {
+    assert_eq!(Clock::new(22, 40), Clock::new(-2, 40));
+}
+
+#[test]
+fn test_compare_clocks_with_negative_hour_that_wraps() {
+    assert_eq!(Clock::new(17, 3), Clock::new(-31, 3));
+}
+
+#[test]
+fn test_compare_clocks_with_negative_hour_that_wraps_multiple_times() {
+    assert_eq!(Clock::new(13, 49), Clock::new(-83, 49));
+}
+
+#[test]
+fn test_compare_clocks_with_minutes_overflow() {
+    assert_eq!(Clock::new(0, 1), Clock::new(0, 1441));
+}
+
+#[test]
+fn test_compare_clocks_with_minutes_overflow_by_several_days() {
+    assert_eq!(Clock::new(2, 2), Clock::new(2, 4322));
+}
+
+#[test]
+fn test_compare_clocks_with_negative_minute() {
+    assert_eq!(Clock::new(2, 40), Clock::new(3, -20))
+}
+
+#[test]
+fn test_compare_clocks_with_negative_minute_that_wraps() {
+    assert_eq!(Clock::new(4, 10), Clock::new(5, -1490))
+}
+
+#[test]
+fn test_compare_clocks_with_negative_minute_that_wraps_multiple() {
+    assert_eq!(Clock::new(6, 15), Clock::new(6, -4305))
+}
+
+#[test]
+fn test_compare_clocks_with_negative_hours_and_minutes() {
+    assert_eq!(Clock::new(7, 32), Clock::new(-12, -268))
+}
+
+#[test]
+fn test_compare_clocks_with_negative_hours_and_minutes_that_wrap() {
+    assert_eq!(Clock::new(18, 7), Clock::new(-54, -11_513))
+}
+
+#[test]
+fn test_compare_full_clock_and_zeroed_clock() {
+    assert_eq!(Clock::new(24, 0), Clock::new(0, 0))
+}