Initial project import

tools/v/vlib/os/process_args_test.v

@@ -0,0 +1,59 @@
+import os
+
+const vexe = os.getenv('VEXE')
+const vroot = os.dir(vexe)
+
+// strip_tcc_fallback_warning removes the noisy macOS-only `warning: tcc compilation
+// failed, falling back to cc` line that v emits to stderr and that os.execute folds
+// into the captured output. The CI path-with-spaces+comma jobs trigger this fallback,
+// which would otherwise prefix the program output and break starts_with assertions.
+fn strip_tcc_fallback_warning(output string) string {
+	mut s := output
+	for s.contains('tcc compilation failed') {
+		nl := s.index('\n') or { return s }
+		s = s[nl + 1..]
+	}
+	return s
+}
+
+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 ${os.quoted_path(echo_os_args)} 1 2 3')
+	println(res123)
+	assert res123.exit_code == 0
+	assert strip_tcc_fallback_warning(res123.output).starts_with("['1', '2', '3']")
+}
+
+fn test_v_run_quoted_args_with_spaces() {
+	echo_os_args := os.join_path(vroot, 'cmd/tools/test_os_args.v')
+	res := os.execute('${os.quoted_path(vexe)} run ${os.quoted_path(echo_os_args)} 1 "Learn V" 3')
+	println(res)
+	assert res.exit_code == 0
+	assert strip_tcc_fallback_warning(res.output).starts_with("['1', 'Learn V', '3']")
+}
+
+fn test_v_run_quoted_args_with_spaces__use_os_system_to_run() {
+	echo_os_args := os.join_path(vroot, 'cmd/tools/test_os_args.v')
+	res :=
+		os.execute('${os.quoted_path(vexe)} -use-os-system-to-run run ${os.quoted_path(echo_os_args)} 1 "Learn V" 3')
+	println(res)
+	assert res.exit_code == 0
+	assert strip_tcc_fallback_warning(res.output).starts_with("['1', 'Learn V', '3']")
+}
+
+fn test_v_run_file_from_path_with_spaces() {
+	echo_os_args := os.join_path(vroot, 'cmd/tools/test_os_args.v')
+	spaced_dir := os.join_path(os.vtmp_dir(), 'v run path with spaces')
+	spaced_echo_os_args := os.join_path(spaced_dir, 'test os args.v')
+	os.rmdir_all(spaced_dir) or {}
+	os.mkdir_all(spaced_dir)!
+	defer {
+		os.rmdir_all(spaced_dir) or {}
+	}
+	os.cp(echo_os_args, spaced_echo_os_args)!
+	res :=
+		os.execute('${os.quoted_path(vexe)} run ${os.quoted_path(spaced_echo_os_args)} 1 "Learn V" 3')
+	println(res)
+	assert res.exit_code == 0
+	assert strip_tcc_fallback_warning(res.output).starts_with("['1', 'Learn V', '3']")
+}