1import time
2
3// NB: on CI jobs, especially msvc ones, sleep_ms may sleep for much more
4// time than you have specified. To avoid false positives from CI test
5// failures, some of the asserts will be run only if you pass `-d stopwatch`
6fn test_stopwatch_works_as_intended() {
7	mut sw := time.new_stopwatch({})
8	// sample code that you want to measure:
9	println('Hello world')
10	time.sleep_ms(1)
11	//
12	println('Greeting the world took: ${sw.elapsed().nanoseconds()}ns')
13	assert sw.elapsed().nanoseconds() > 0
14}
15
16fn test_stopwatch_time_between_pause_and_start_should_be_skipped_in_elapsed() {
17	println('Testing pause function')
18	mut sw := time.new_stopwatch({})
19	time.sleep_ms(10) // A
20	eprintln('Elapsed after 10ms nap: ${sw.elapsed().milliseconds()}ms')
21	assert sw.elapsed().milliseconds() >= 10
22	sw.pause()
23	time.sleep_ms(10)
24	eprintln('Elapsed after pause and another 10ms nap: ${sw.elapsed().milliseconds()}ms')
25	assert sw.elapsed().milliseconds() >= 10
26	$if stopwatch ? {
27		assert sw.elapsed().milliseconds() < 20
28	}
29	sw.start()
30	time.sleep_ms(10) // B
31	eprintln('Elapsed after resume and another 10ms nap: ${sw.elapsed().milliseconds()}ms')
32	assert sw.elapsed().milliseconds() >= 20
33	$if stopwatch ? {
34		assert sw.elapsed().milliseconds() < 30
35	}
36}
37