Adds most of the toolsHEADmaster

1 files changed, 752 insertions, 0 deletions

diff --git a/v_windows/v/vlib/os/os_test.v b/v_windows/v/vlib/os/os_test.v
new file mode 100644
index 0000000..2fff68e
--- /dev/null
+++ b/v_windows/v/vlib/os/os_test.v
@@ -0,0 +1,752 @@
+import os
+import time
+
+const (
+	// tfolder will contain all the temporary files/subfolders made by
+	// the different tests. It would be removed in testsuite_end(), so
+	// individual os tests do not need to clean up after themselves.
+	tfolder = os.join_path(os.temp_dir(), 'v', 'tests', 'os_test')
+)
+
+// os.args has to be *already initialized* with the program's argc/argv at this point
+// thus it can be used for other consts too:
+const args_at_start = os.args.clone()
+
+fn testsuite_begin() {
+	eprintln('testsuite_begin, tfolder = $tfolder')
+	os.rmdir_all(tfolder) or {}
+	assert !os.is_dir(tfolder)
+	os.mkdir_all(tfolder) or { panic(err) }
+	os.chdir(tfolder) or {}
+	assert os.is_dir(tfolder)
+	// println('args_at_start: $args_at_start')
+	assert args_at_start.len > 0
+	assert args_at_start == os.args
+}
+
+fn testsuite_end() {
+	os.chdir(os.wd_at_startup) or {}
+	os.rmdir_all(tfolder) or {}
+	assert !os.is_dir(tfolder)
+	// eprintln('testsuite_end  , tfolder = $tfolder removed.')
+}
+
+fn test_open_file() {
+	filename := './test1.txt'
+	hello := 'hello world!'
+	os.open_file(filename, 'r+', 0o666) or {
+		assert err.msg == 'No such file or directory'
+		os.File{}
+	}
+	mut file := os.open_file(filename, 'w+', 0o666) or { panic(err) }
+	file.write_string(hello) or { panic(err) }
+	file.close()
+	assert hello.len == os.file_size(filename)
+	read_hello := os.read_file(filename) or { panic('error reading file $filename') }
+	assert hello == read_hello
+	os.rm(filename) or { panic(err) }
+}
+
+fn test_open_file_binary() {
+	filename := './test1.dat'
+	hello := 'hello \n world!'
+	os.open_file(filename, 'r+', 0o666) or {
+		assert err.msg == 'No such file or directory'
+		os.File{}
+	}
+	mut file := os.open_file(filename, 'wb+', 0o666) or { panic(err) }
+	bytes := hello.bytes()
+	unsafe { file.write_ptr(bytes.data, bytes.len) }
+	file.close()
+	assert hello.len == os.file_size(filename)
+	read_hello := os.read_bytes(filename) or { panic('error reading file $filename') }
+	assert bytes == read_hello
+	os.rm(filename) or { panic(err) }
+}
+
+// fn test_file_get_line() {
+// 	filename := './fgetline.txt'
+// 	os.write_file(filename, 'line 1\nline 2')
+// 	mut f := os.open_file(filename, 'r', 0) or {
+// 		assert false
+// 		return
+// 	}
+// 	line1 := f.get_line() or {
+// 		''
+// 	}
+// 	line2 := f.get_line() or {
+// 		''
+// 	}
+// 	f.close()
+// 	//
+// 	eprintln('line1: $line1 $line1.bytes()')
+// 	eprintln('line2: $line2 $line2.bytes()')
+// 	assert line1 == 'line 1\n'
+// 	assert line2 == 'line 2'
+// }
+fn test_create_file() {
+	filename := './test1.txt'
+	hello := 'hello world!'
+	mut f := os.create(filename) or { panic(err) }
+	f.write_string(hello) or { panic(err) }
+	f.close()
+	assert hello.len == os.file_size(filename)
+	os.rm(filename) or { panic(err) }
+}
+
+fn test_is_file() {
+	// Setup
+	work_dir := os.join_path(os.getwd(), 'is_file_test')
+	os.mkdir_all(work_dir) or { panic(err) }
+	tfile := os.join_path(work_dir, 'tmp_file')
+	// Test things that shouldn't be a file
+	assert os.is_file(work_dir) == false
+	assert os.is_file('non-existent_file.tmp') == false
+	// Test file
+	tfile_content := 'temporary file'
+	os.write_file(tfile, tfile_content) or { panic(err) }
+	assert os.is_file(tfile)
+	// Test dir symlinks
+	$if windows {
+		assert true
+	} $else {
+		dsymlink := os.join_path(work_dir, 'dir_symlink')
+		os.symlink(work_dir, dsymlink) or { panic(err) }
+		assert os.is_file(dsymlink) == false
+	}
+	// Test file symlinks
+	$if windows {
+		assert true
+	} $else {
+		fsymlink := os.join_path(work_dir, 'file_symlink')
+		os.symlink(tfile, fsymlink) or { panic(err) }
+		assert os.is_file(fsymlink)
+	}
+}
+
+fn test_write_and_read_string_to_file() {
+	filename := './test1.txt'
+	hello := 'hello world!'
+	os.write_file(filename, hello) or { panic(err) }
+	assert hello.len == os.file_size(filename)
+	read_hello := os.read_file(filename) or { panic('error reading file $filename') }
+	assert hello == read_hello
+	os.rm(filename) or { panic(err) }
+}
+
+// test_write_and_read_bytes checks for regressions made in the functions
+// read_bytes, read_bytes_at and write_bytes.
+fn test_write_and_read_bytes() {
+	file_name := './byte_reader_writer.tst'
+	payload := [byte(`I`), `D`, `D`, `Q`, `D`]
+	mut file_write := os.create(os.real_path(file_name)) or {
+		eprintln('failed to create file $file_name')
+		return
+	}
+	// We use the standard write_bytes function to write the payload and
+	// compare the length of the array with the file size (have to match).
+	unsafe { file_write.write_ptr(payload.data, 5) }
+	file_write.close()
+	assert payload.len == os.file_size(file_name)
+	mut file_read := os.open(os.real_path(file_name)) or {
+		eprintln('failed to open file $file_name')
+		return
+	}
+	// We only need to test read_bytes because this function calls
+	// read_bytes_at with second parameter zeroed (size, 0).
+	rbytes := file_read.read_bytes(5)
+	// eprintln('rbytes: $rbytes')
+	// eprintln('payload: $payload')
+	assert rbytes == payload
+	// check that trying to read data from EOF doesn't error and returns 0
+	mut a := []byte{len: 5}
+	nread := file_read.read_bytes_into(5, mut a) or {
+		n := if err is none {
+			int(0)
+		} else {
+			eprintln(err)
+			int(-1)
+		}
+		n
+	}
+	assert nread == 0
+	file_read.close()
+	// We finally delete the test file.
+	os.rm(file_name) or { panic(err) }
+}
+
+fn test_create_and_delete_folder() {
+	folder := './test1'
+	os.mkdir(folder) or { panic(err) }
+	assert os.is_dir(folder)
+	folder_contents := os.ls(folder) or { panic(err) }
+	assert folder_contents.len == 0
+	os.rmdir(folder) or { panic(err) }
+	folder_exists := os.is_dir(folder)
+	assert folder_exists == false
+}
+
+fn walk_callback(file string) {
+	if file == '.' || file == '..' {
+		return
+	}
+	assert file == 'test_walk' + os.path_separator + 'test1'
+}
+
+fn test_walk() {
+	folder := 'test_walk'
+	os.mkdir(folder) or { panic(err) }
+	file1 := folder + os.path_separator + 'test1'
+	os.write_file(file1, 'test-1') or { panic(err) }
+	os.walk(folder, walk_callback)
+	os.rm(file1) or { panic(err) }
+	os.rmdir(folder) or { panic(err) }
+}
+
+fn test_cp() {
+	old_file_name := 'cp_example.txt'
+	new_file_name := 'cp_new_example.txt'
+	os.write_file(old_file_name, 'Test data 1 2 3, V is awesome #$%^[]!~⭐') or { panic(err) }
+	os.cp(old_file_name, new_file_name) or { panic('$err') }
+	old_file := os.read_file(old_file_name) or { panic(err) }
+	new_file := os.read_file(new_file_name) or { panic(err) }
+	assert old_file == new_file
+	os.rm(old_file_name) or { panic(err) }
+	os.rm(new_file_name) or { panic(err) }
+}
+
+fn test_mv() {
+	work_dir := os.join_path(os.getwd(), 'mv_test')
+	os.mkdir_all(work_dir) or { panic(err) }
+	// Setup test files
+	tfile1 := os.join_path(work_dir, 'file')
+	tfile2 := os.join_path(work_dir, 'file.test')
+	tfile3 := os.join_path(work_dir, 'file.3')
+	tfile_content := 'temporary file'
+	os.write_file(tfile1, tfile_content) or { panic(err) }
+	os.write_file(tfile2, tfile_content) or { panic(err) }
+	// Setup test dirs
+	tdir1 := os.join_path(work_dir, 'dir')
+	tdir2 := os.join_path(work_dir, 'dir2')
+	tdir3 := os.join_path(work_dir, 'dir3')
+	os.mkdir(tdir1) or { panic(err) }
+	os.mkdir(tdir2) or { panic(err) }
+	// Move file with no extension to dir
+	os.mv(tfile1, tdir1) or { panic(err) }
+	mut expected := os.join_path(tdir1, 'file')
+	assert os.exists(expected)
+	assert !os.is_dir(expected)
+	// Move dir with contents to other dir
+	os.mv(tdir1, tdir2) or { panic(err) }
+	expected = os.join_path(tdir2, 'dir')
+	assert os.exists(expected)
+	assert os.is_dir(expected)
+	expected = os.join_path(tdir2, 'dir', 'file')
+	assert os.exists(expected)
+	assert !os.is_dir(expected)
+	// Move dir with contents to other dir (by renaming)
+	os.mv(os.join_path(tdir2, 'dir'), tdir3) or { panic(err) }
+	expected = tdir3
+	assert os.exists(expected)
+	assert os.is_dir(expected)
+	assert os.is_dir_empty(tdir2)
+	// Move file with extension to dir
+	os.mv(tfile2, tdir2) or { panic(err) }
+	expected = os.join_path(tdir2, 'file.test')
+	assert os.exists(expected)
+	assert !os.is_dir(expected)
+	// Move file to dir (by renaming)
+	os.mv(os.join_path(tdir2, 'file.test'), tfile3) or { panic(err) }
+	expected = tfile3
+	assert os.exists(expected)
+	assert !os.is_dir(expected)
+}
+
+fn test_cp_all() {
+	// fileX -> dir/fileX
+	// NB: clean up of the files happens inside the cleanup_leftovers function
+	os.write_file('ex1.txt', 'wow!') or { panic(err) }
+	os.mkdir('ex') or { panic(err) }
+	os.cp_all('ex1.txt', 'ex', false) or { panic(err) }
+	old := os.read_file('ex1.txt') or { panic(err) }
+	new := os.read_file('ex/ex1.txt') or { panic(err) }
+	assert old == new
+	os.mkdir('ex/ex2') or { panic(err) }
+	os.write_file('ex2.txt', 'great!') or { panic(err) }
+	os.cp_all('ex2.txt', 'ex/ex2', false) or { panic(err) }
+	old2 := os.read_file('ex2.txt') or { panic(err) }
+	new2 := os.read_file('ex/ex2/ex2.txt') or { panic(err) }
+	assert old2 == new2
+	// recurring on dir -> local dir
+	os.cp_all('ex', './', true) or { panic(err) }
+	// regression test for executive runs with overwrite := true
+	os.cp_all('ex', './', true) or { panic(err) }
+	os.cp_all('ex', 'nonexisting', true) or { panic(err) }
+	assert os.exists(os.join_path('nonexisting', 'ex1.txt'))
+}
+
+fn test_realpath_of_empty_string_works() {
+	assert os.real_path('') == ''
+}
+
+fn test_realpath_non_existing() {
+	non_existing_path := 'sdyfuisd_non_existing_file'
+	rpath := os.real_path(non_existing_path)
+	$if windows {
+		// on windows, the workdir is prepended, so the result is absolute:
+		assert rpath.len > non_existing_path.len
+	}
+	$if !windows {
+		// on unix, the workdir is NOT prepended for now, so the result remains the same.
+		// TODO: the windows behaviour seems saner, think about normalising the unix case to do the same.
+		assert os.real_path(non_existing_path) == non_existing_path
+	}
+}
+
+fn test_realpath_existing() {
+	existing_file_name := 'existing_file.txt'
+	existing_file := os.join_path(os.temp_dir(), existing_file_name)
+	os.rm(existing_file) or {}
+	os.write_file(existing_file, 'abc') or {}
+	assert os.exists(existing_file)
+	rpath := os.real_path(existing_file)
+	assert os.is_abs_path(rpath)
+	assert rpath.ends_with(existing_file_name)
+	os.rm(existing_file) or {}
+}
+
+fn test_realpath_removes_dots() {
+	examples_folder := os.join_path(@VEXEROOT, 'vlib', 'v', '..', '..', 'cmd', '.', '..',
+		'examples')
+	real_path_of_examples_folder := os.real_path(examples_folder)
+	assert real_path_of_examples_folder.len < examples_folder.len
+	assert !real_path_of_examples_folder.contains('..')
+}
+
+fn test_realpath_absolutizes_existing_relative_paths() {
+	old_wd := os.getwd()
+	defer {
+		os.chdir(old_wd) or { panic(err) }
+	}
+	os.chdir(@VEXEROOT) or { panic(err) }
+	examples_folder := os.join_path('vlib', 'v', '..', '..', 'cmd', '.', '..', 'examples')
+	real_path_of_examples_folder := os.real_path(examples_folder)
+	assert os.is_abs_path(real_path_of_examples_folder)
+}
+
+// TODO: think much more about whether this is desirable:
+fn test_realpath_does_not_absolutize_non_existing_relative_paths() {
+	relative_path := os.join_path('one', 'nonexisting_folder', '..', 'something')
+	$if !windows {
+		assert os.real_path(relative_path).contains('..')
+		assert os.real_path(relative_path) == relative_path
+	}
+}
+
+fn test_realpath_absolutepath_symlink() ? {
+	file_name := 'tolink_file.txt'
+	symlink_name := 'symlink.txt'
+	mut f := os.create(file_name) ?
+	f.close()
+	assert os.symlink(file_name, symlink_name) ?
+	rpath := os.real_path(symlink_name)
+	println(rpath)
+	assert os.is_abs_path(rpath)
+	assert rpath.ends_with(file_name)
+	os.rm(symlink_name) or {}
+	os.rm(file_name) or {}
+}
+
+fn test_tmpdir() {
+	t := os.temp_dir()
+	assert t.len > 0
+	assert os.is_dir(t)
+	tfile := t + os.path_separator + 'tmpfile.txt'
+	os.rm(tfile) or {} // just in case
+	tfile_content := 'this is a temporary file'
+	os.write_file(tfile, tfile_content) or { panic(err) }
+	tfile_content_read := os.read_file(tfile) or { panic(err) }
+	assert tfile_content_read == tfile_content
+	os.rm(tfile) or { panic(err) }
+}
+
+fn test_is_writable_folder() {
+	tmp := os.temp_dir()
+	f := os.is_writable_folder(tmp) or {
+		eprintln('err: $err')
+		false
+	}
+	assert f
+}
+
+fn test_make_symlink_check_is_link_and_remove_symlink() {
+	folder := 'tfolder'
+	symlink := 'tsymlink'
+	// windows creates a directory symlink, so delete it with rmdir()
+	$if windows {
+		os.rmdir(symlink) or {}
+	} $else {
+		os.rm(symlink) or {}
+	}
+	os.rmdir(folder) or {}
+	os.mkdir(folder) or { panic(err) }
+	folder_contents := os.ls(folder) or { panic(err) }
+	assert folder_contents.len == 0
+	os.symlink(folder, symlink) or { panic(err) }
+	assert os.is_link(symlink)
+	$if windows {
+		os.rmdir(symlink) or { panic(err) }
+	} $else {
+		os.rm(symlink) or { panic(err) }
+	}
+	os.rmdir(folder) or { panic(err) }
+	folder_exists := os.is_dir(folder)
+	assert folder_exists == false
+	symlink_exists := os.is_link(symlink)
+	assert symlink_exists == false
+}
+
+fn test_make_symlink_check_is_link_and_remove_symlink_with_file() {
+	file := 'tfile'
+	symlink := 'tsymlink'
+	os.rm(symlink) or {}
+	os.rm(file) or {}
+	mut f := os.create(file) or { panic(err) }
+	f.close()
+	os.symlink(file, symlink) or { panic(err) }
+	assert os.is_link(symlink)
+	os.rm(symlink) or { panic(err) }
+	os.rm(file) or { panic(err) }
+	symlink_exists := os.is_link(symlink)
+	assert symlink_exists == false
+}
+
+fn test_make_hardlink_check_is_link_and_remove_hardlink_with_file() {
+	file := 'tfile'
+	symlink := 'tsymlink'
+	os.rm(symlink) or {}
+	os.rm(file) or {}
+	mut f := os.create(file) or { panic(err) }
+	f.close()
+	os.link(file, symlink) or { panic(err) }
+	assert os.exists(symlink)
+	os.rm(symlink) or { panic(err) }
+	os.rm(file) or { panic(err) }
+	symlink_exists := os.is_link(symlink)
+	assert symlink_exists == false
+}
+
+// fn test_fork() {
+// pid := os.fork()
+// if pid == 0 {
+// println('Child')
+// }
+// else {
+// println('Parent')
+// }
+// }
+// fn test_wait() {
+// pid := os.fork()
+// if pid == 0 {
+// println('Child')
+// exit(0)
+// }
+// else {
+// cpid := os.wait()
+// println('Parent')
+// println(cpid)
+// }
+// }
+fn test_symlink() {
+	os.mkdir('symlink') or { panic(err) }
+	os.symlink('symlink', 'symlink2') or { panic(err) }
+	assert os.exists('symlink2')
+	// cleanup
+	os.rmdir('symlink') or { panic(err) }
+	$if windows {
+		os.rmdir('symlink2') or { panic(err) }
+	} $else {
+		os.rm('symlink2') or { panic(err) }
+	}
+}
+
+fn test_is_executable_writable_readable() {
+	file_name := 'rwxfile.exe'
+	mut f := os.create(file_name) or {
+		eprintln('failed to create file $file_name')
+		return
+	}
+	f.close()
+	$if !windows {
+		os.chmod(file_name, 0o600) or {} // mark as readable && writable, but NOT executable
+		assert os.is_writable(file_name)
+		assert os.is_readable(file_name)
+		assert !os.is_executable(file_name)
+		os.chmod(file_name, 0o700) or {} // mark as executable too
+		assert os.is_executable(file_name)
+	} $else {
+		assert os.is_writable(file_name)
+		assert os.is_readable(file_name)
+		assert os.is_executable(file_name)
+	}
+	// We finally delete the test file.
+	os.rm(file_name) or { panic(err) }
+}
+
+fn test_ext() {
+	assert os.file_ext('file.v') == '.v'
+	assert os.file_ext('file') == ''
+}
+
+fn test_is_abs() {
+	assert os.is_abs_path('/home/user')
+	assert os.is_abs_path('v/vlib') == false
+	$if windows {
+		assert os.is_abs_path('C:\\Windows\\')
+	}
+}
+
+fn test_join() {
+	$if windows {
+		assert os.join_path('v', 'vlib', 'os') == 'v\\vlib\\os'
+	} $else {
+		assert os.join_path('v', 'vlib', 'os') == 'v/vlib/os'
+	}
+}
+
+fn test_rmdir_all() {
+	mut dirs := ['some/dir', 'some/.hidden/directory']
+	$if windows {
+		for mut d in dirs {
+			d = d.replace('/', '\\')
+		}
+	}
+	for d in dirs {
+		os.mkdir_all(d) or { panic(err) }
+		assert os.is_dir(d)
+	}
+	os.rmdir_all('some') or { assert false }
+	assert !os.exists('some')
+}
+
+fn test_dir() {
+	$if windows {
+		assert os.dir('C:\\a\\b\\c') == 'C:\\a\\b'
+		assert os.dir('C:\\a\\b\\') == 'C:\\a\\b'
+		assert os.dir('C:/a/b/c') == 'C:\\a\\b'
+		assert os.dir('C:/a/b/') == 'C:\\a\\b'
+	} $else {
+		assert os.dir('/') == '/'
+		assert os.dir('/abc') == '/'
+		assert os.dir('/var/tmp/foo') == '/var/tmp'
+		assert os.dir('/var/tmp/') == '/var/tmp'
+		assert os.dir('C:\\a\\b\\c') == 'C:/a/b'
+		assert os.dir('C:\\a\\b\\') == 'C:/a/b'
+	}
+	assert os.dir('os') == '.'
+}
+
+fn test_base() {
+	$if windows {
+		assert os.base('v\\vlib\\os') == 'os'
+		assert os.base('v\\vlib\\os\\') == 'os'
+		assert os.base('v/vlib/os') == 'os'
+		assert os.base('v/vlib/os/') == 'os'
+	} $else {
+		assert os.base('v/vlib/os') == 'os'
+		assert os.base('v/vlib/os/') == 'os'
+		assert os.base('v\\vlib\\os') == 'os'
+		assert os.base('v\\vlib\\os\\') == 'os'
+	}
+	assert os.base('filename') == 'filename'
+}
+
+fn test_file_name() {
+	$if windows {
+		assert os.file_name('v\\vlib\\os\\os.v') == 'os.v'
+		assert os.file_name('v\\vlib\\os\\') == ''
+		assert os.file_name('v\\vlib\\os') == 'os'
+	} $else {
+		assert os.file_name('v/vlib/os/os.v') == 'os.v'
+		assert os.file_name('v/vlib/os/') == ''
+		assert os.file_name('v/vlib/os') == 'os'
+	}
+	assert os.file_name('filename') == 'filename'
+}
+
+fn test_uname() {
+	u := os.uname()
+	assert u.sysname.len > 0
+	assert u.nodename.len > 0
+	assert u.release.len > 0
+	assert u.version.len > 0
+	assert u.machine.len > 0
+}
+
+// tests for write_file_array and read_file_array<T>:
+const (
+	maxn = 3
+)
+
+struct IntPoint {
+	x int
+	y int
+}
+
+fn test_write_file_array_bytes() {
+	fpath := './abytes.bin'
+	mut arr := []byte{len: maxn}
+	for i in 0 .. maxn {
+		arr[i] = 65 + byte(i)
+	}
+	os.write_file_array(fpath, arr) or { panic(err) }
+	rarr := os.read_bytes(fpath) or { panic(err) }
+	assert arr == rarr
+	// eprintln(arr.str())
+	// eprintln(rarr.str())
+}
+
+fn test_write_file_array_structs() {
+	fpath := './astructs.bin'
+	mut arr := []IntPoint{len: maxn}
+	for i in 0 .. maxn {
+		arr[i] = IntPoint{65 + i, 65 + i + 10}
+	}
+	os.write_file_array(fpath, arr) or { panic(err) }
+	rarr := os.read_file_array<IntPoint>(fpath)
+	assert rarr == arr
+	assert rarr.len == maxn
+	// eprintln( rarr.str().replace('\n', ' ').replace('},', '},\n'))
+}
+
+fn test_stdout_capture() {
+	/*
+	mut cmd := os.Command{
+	path:'cat'
+	redirect_stdout: true
+}
+cmd.start()
+for !cmd.eof {
+	line := cmd.read_line()
+	println('line="$line"')
+}
+cmd.close()
+	*/
+}
+
+fn test_posix_set_bit() {
+	$if windows {
+		assert true
+	} $else {
+		fpath := '/tmp/permtest'
+		os.create(fpath) or { panic("Couldn't create file") }
+		os.chmod(fpath, 0o0777) or { panic(err) }
+		c_fpath := &char(fpath.str)
+		mut s := C.stat{}
+		unsafe {
+			C.stat(c_fpath, &s)
+		}
+		// Take the permissions part of the mode
+		mut mode := u32(s.st_mode) & 0o0777
+		assert mode == 0o0777
+		// `chmod u-r`
+		os.posix_set_permission_bit(fpath, os.s_irusr, false)
+		unsafe {
+			C.stat(c_fpath, &s)
+		}
+		mode = u32(s.st_mode) & 0o0777
+		assert mode == 0o0377
+		// `chmod u+r`
+		os.posix_set_permission_bit(fpath, os.s_irusr, true)
+		unsafe {
+			C.stat(c_fpath, &s)
+		}
+		mode = u32(s.st_mode) & 0o0777
+		assert mode == 0o0777
+		// NB: setting the sticky bit is platform dependend
+		// `chmod -s -g -t`
+		os.posix_set_permission_bit(fpath, os.s_isuid, false)
+		os.posix_set_permission_bit(fpath, os.s_isgid, false)
+		os.posix_set_permission_bit(fpath, os.s_isvtx, false)
+		unsafe {
+			C.stat(c_fpath, &s)
+		}
+		mode = u32(s.st_mode) & 0o0777
+		assert mode == 0o0777
+		// `chmod g-w o-w`
+		os.posix_set_permission_bit(fpath, os.s_iwgrp, false)
+		os.posix_set_permission_bit(fpath, os.s_iwoth, false)
+		unsafe {
+			C.stat(c_fpath, &s)
+		}
+		mode = u32(s.st_mode) & 0o7777
+		assert mode == 0o0755
+		os.rm(fpath) or {}
+	}
+}
+
+fn test_exists_in_system_path() {
+	assert os.exists_in_system_path('') == false
+	$if windows {
+		assert os.exists_in_system_path('cmd.exe')
+		return
+	}
+	assert os.exists_in_system_path('ls')
+}
+
+fn test_truncate() {
+	filename := './test_trunc.txt'
+	hello := 'hello world!'
+	mut f := os.create(filename) or { panic(err) }
+	f.write_string(hello) or { panic(err) }
+	f.close()
+	assert hello.len == os.file_size(filename)
+	newlen := u64(40000)
+	os.truncate(filename, newlen) or { panic(err) }
+	assert newlen == os.file_size(filename)
+	os.rm(filename) or { panic(err) }
+}
+
+fn test_hostname() {
+	assert os.hostname().len > 2
+}
+
+fn test_glob() {
+	os.mkdir('test_dir') or { panic(err) }
+	for i in 0 .. 4 {
+		if i == 3 {
+			mut f := os.create('test_dir/test0_another') or { panic(err) }
+			f.close()
+			mut f1 := os.create('test_dir/test') or { panic(err) }
+			f1.close()
+		} else {
+			mut f := os.create('test_dir/test' + i.str()) or { panic(err) }
+			f.close()
+		}
+	}
+	files := os.glob('test_dir/t*') or { panic(err) }
+	assert files.len == 5
+	assert os.base(files[0]) == 'test'
+
+	for i in 0 .. 3 {
+		os.rm('test_dir/test' + i.str()) or { panic(err) }
+	}
+	os.rm('test_dir/test0_another') or { panic(err) }
+	os.rm('test_dir/test') or { panic(err) }
+	os.rmdir_all('test_dir') or { panic(err) }
+}
+
+fn test_utime() {
+	filename := './test_utime.txt'
+	hello := 'hello world!'
+	mut f := os.create(filename) or { panic(err) }
+	defer {
+		f.close()
+		os.rm(filename) or { panic(err) }
+	}
+	f.write_string(hello) or { panic(err) }
+	atime := time.now().add_days(2).unix_time()
+	mtime := time.now().add_days(4).unix_time()
+	os.utime(filename, int(atime), int(mtime)) or { panic(err) }
+	assert os.file_last_mod_unix(filename) == mtime
+}