Initial project import

tools/v/vlib/log/default_test.v

@@ -0,0 +1,38 @@
+import log
+import time
+
+fn test_default_log_instance() {
+	println(@FN + ' start')
+	log.info('info')
+	log.warn('warn')
+	log.error('error')
+	log.debug('no output for debug')
+	println('^^^ there should be no `no output for debug` shown above')
+	log.set_level(.debug)
+	log.debug('debug now')
+	println('^^^ there should be `debug now` shown above')
+	log.set_level(log.level_from_tag('INFO') or { log.Level.disabled })
+	log.info('info again')
+	log.debug('no output for debug')
+	log.set_level(log.level_from_tag('') or { log.Level.disabled })
+	log.error('no output anymore')
+	println('^^^ there should be no `no output anymore` shown above')
+	println(@FN + ' end')
+}
+
+fn log_messages(tidx int) {
+	time.sleep(2 * time.millisecond)
+	for i in 0 .. 3 {
+		log.debug('hi from thread ${tidx}')
+	}
+}
+
+fn test_default_log_instance_used_in_multiple_threads() {
+	eprintln('\n${@METHOD} start')
+	log.set_level(.debug)
+	mut threads := []thread{}
+	for tidx in 0 .. 3 {
+		threads << spawn log_messages(tidx)
+	}
+	threads.wait()
+}