os: make process_test.v more portable (prepare for windows)

cmd/tools/test_os_process.v

@@ -53,19 +53,20 @@ fn main() {
 	args := os.args[1..]
 	if '-h' in args || '--help' in args {
 		println("Usage:
-	test_os_process [-v] [-h] [-target stderr/stdout/both/alternate] [-exitcode 0] [-timeout_ms 1000] [-period_ms 100]
+	test_os_process [-v] [-h] [-target stderr/stdout/both/alternate] [-exitcode 0] [-timeout_ms 200] [-period_ms 50]
 		Prints lines periodically (-period_ms), to stdout/stderr (-target). 
 		After a while (-timeout_ms), exit with (-exitcode).
 		This program is useful for platform independent testing
 		of child process/standart input/output control.
 		It is used in V's `os` module tests.
 ")
+		return
 	}
 	ctx.is_verbose = '-v' in args
 	ctx.target = s2target(cmdline.option(args, '-target', 'both'))
 	ctx.exitcode = cmdline.option(args, '-exitcode', '0').int()
-	ctx.timeout_ms = cmdline.option(args, '-timeout_ms', '1000').int()
+	ctx.timeout_ms = cmdline.option(args, '-timeout_ms', '200').int()
-	ctx.period_ms = cmdline.option(args, '-period_ms', '100').int()
+	ctx.period_ms = cmdline.option(args, '-period_ms', '50').int()
 	if ctx.target == .alternate {
 		ctx.omode = .stdout
 	}

vlib/os/process_test.v

@@ -1,6 +1,19 @@
 import os
 import time
 
+const vexe = os.getenv('VEXE')
+
+const vroot = os.dir(vexe)
+
+const test_os_process = os.join_path(os.temp_dir(), 'v', 'test_os_process.exe')
+
+const test_os_process_source = os.join_path(vroot, 'cmd/tools/test_os_process.v')
+
+fn testsuite_begin() {
+	os.rm(test_os_process) or { }
+	assert os.system('$vexe -o $test_os_process $test_os_process_source') == 0
+}
+
 fn test_getpid() {
 	pid := os.getpid()
 	eprintln('current pid: $pid')
@@ -12,8 +25,8 @@ fn test_run() {
 		return
 	}
 	//
-	mut p := os.new_process('/bin/sleep')
+	mut p := os.new_process(test_os_process)
-	p.set_args(['0.2'])
+	p.set_args(['-timeout_ms', '150', '-period_ms', '50'])
 	p.run()
 	assert p.status == .running
 	assert p.pid > 0
@@ -23,7 +36,9 @@ fn test_run() {
 		if !p.is_alive() {
 			break
 		}
-		os.system('ps -opid= -oppid= -ouser= -onice= -of= -ovsz= -orss= -otime= -oargs= -p $p.pid')
+		$if trace_process_output ? {
+			os.system('ps -opid= -oppid= -ouser= -onice= -of= -ovsz= -orss= -otime= -oargs= -p $p.pid')
+		}
 		time.wait(50 * time.millisecond)
 		i++
 	}
@@ -39,24 +54,38 @@ fn test_wait() {
 	if os.user_os() == 'windows' {
 		return
 	}
-	mut p := os.new_process('/bin/date')
+	mut p := os.new_process(test_os_process)
+	assert p.status != .exited
 	p.wait()
-	assert p.pid != os.getpid()
-	assert p.code == 0
 	assert p.status == .exited
+	assert p.code == 0
+	assert p.pid != os.getpid()
 }
 
 fn test_slurping_output() {
 	if os.user_os() == 'windows' {
 		return
 	}
-	mut p := os.new_process('/bin/date')
+	mut p := os.new_process(test_os_process)
 	p.set_redirect_stdio()
+	assert p.status != .exited
 	p.wait()
-	assert p.code == 0
 	assert p.status == .exited
+	assert p.code == 0
 	output := p.stdout_slurp().trim_space()
 	errors := p.stderr_slurp().trim_space()
-	eprintln('p output: "$output"')
+	$if trace_process_output ? {
-	eprintln('p errors: "$errors"')
+		eprintln('---------------------------')
+		eprintln('p output: "$output"')
+		eprintln('p errors: "$errors"')
+		eprintln('---------------------------')
+	}
+	assert output.contains('stdout, 1')
+	assert output.contains('stdout, 2')
+	assert output.contains('stdout, 3')
+	assert output.contains('stdout, 4')
+	assert errors.contains('stderr, 1')
+	assert errors.contains('stderr, 2')
+	assert errors.contains('stderr, 3')
+	assert errors.contains('stderr, 4')
 }