add v run args test

Author: spytheman

cmd/tools/test_os_args.v

@@ -0,0 +1 @@
+println(arguments()#[1..])

vlib/os/process_args_test.v

@@ -0,0 +1,20 @@
+import os
+
+const vexe = os.getenv('VEXE')
+const vroot = os.dir(vexe)
+
+fn test_v_run_simple() {
+	echo_os_args := os.join_path(vroot, 'cmd/tools/test_os_args.v')
+	res123 := os.execute('${os.quoted_path(vexe)} run ${os.quoted_path(echo_os_args)} 1 2 3')
+	println(res123)
+	assert res123.exit_code == 0
+	assert res123.output.starts_with("['1', '2', '3']")
+}
+
+fn test_v_run_quoted_args_with_spaces() {
+	echo_os_args := os.join_path(vroot, 'cmd/tools/test_os_args.v')
+	res := os.execute('${os.quoted_path(vexe)} run ${os.quoted_path(echo_os_args)} 1 "Learn V" 3')
+	println(res)
+	assert res.exit_code == 0
+	assert res.output.starts_with("['1', 'Learn V', '3']")
+}