1 files changed, 36 insertions, 0 deletions
diff --git a/v_windows/v/vlib/time/stopwatch_test.v b/v_windows/v/vlib/time/stopwatch_test.v
new file mode 100644
index 0000000..49d005a
--- /dev/null
+++ b/v_windows/v/vlib/time/stopwatch_test.v
@@ -0,0 +1,36 @@
+import time
+
+// NB: on CI jobs, especially msvc ones, sleep_ms may sleep for much more
+// time than you have specified. To avoid false positives from CI test
+// failures, some of the asserts will be run only if you pass `-d stopwatch`
+fn test_stopwatch_works_as_intended() {
+	mut sw := time.new_stopwatch()
+	// sample code that you want to measure:
+	println('Hello world')
+	time.sleep(1 * time.millisecond)
+	//
+	println('Greeting the world took: ${sw.elapsed().nanoseconds()}ns')
+	assert sw.elapsed().nanoseconds() > 0
+}
+
+fn test_stopwatch_time_between_pause_and_start_should_be_skipped_in_elapsed() {
+	println('Testing pause function')
+	mut sw := time.new_stopwatch()
+	time.sleep(10 * time.millisecond) // A
+	eprintln('Elapsed after 10ms nap: ${sw.elapsed().milliseconds()}ms')
+	assert sw.elapsed().milliseconds() >= 8 // sometimes it sleeps for 9ms on windows..
+	sw.pause()
+	time.sleep(10 * time.millisecond)
+	eprintln('Elapsed after pause and another 10ms nap: ${sw.elapsed().milliseconds()}ms')
+	assert sw.elapsed().milliseconds() >= 8
+	$if stopwatch ? {
+		assert sw.elapsed().milliseconds() < 20
+	}
+	sw.start()
+	time.sleep(10 * time.millisecond) // B
+	eprintln('Elapsed after resume and another 10ms nap: ${sw.elapsed().milliseconds()}ms')
+	assert sw.elapsed().milliseconds() >= 18
+	$if stopwatch ? {
+		assert sw.elapsed().milliseconds() < 30
+	}
+}