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v/vlib/os/file_test.v

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import os
struct Point {
x f64
y f64
z f64
}
struct Extended_Point {
a f64
b f64
c f64
d f64
e f64
f f64
g f64
h f64
i f64
}
const unit_point = Point{1.0, 1.0, 1.0}
const tfolder = os.join_path(os.temp_dir(), 'os_file_test')
const tfile = os.join_path(tfolder, 'test_file')
const another_point = Point{0.25, 2.25, 6.25}
const extended_point = Extended_Point{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0}
fn testsuite_begin() {
os.rmdir_all(tfolder) or {}
assert !os.is_dir(tfolder)
os.mkdir_all(tfolder) or { panic(err) }
os.chdir(tfolder)
assert os.is_dir(tfolder)
}
fn testsuite_end() {
os.chdir(os.wd_at_startup)
os.rmdir_all(tfolder) or { panic(err) }
assert !os.is_dir(tfolder)
}
fn test_write_struct() {
size_of_point := int(sizeof(Point))
mut f := os.open_file(tfile, 'w') or { panic(err) }
f.write_struct(another_point) or { panic(err) }
f.close()
x := os.read_file(tfile) or { panic(err) }
y := unsafe { byteptr(memdup(&another_point, size_of_point)).vstring_with_len(size_of_point) }
assert x == y
$if debug {
eprintln(x.bytes())
eprintln(y.bytes())
}
}
fn test_read_struct() {
mut f := os.open_file(tfile, 'w') or { panic(err) }
f.write_struct(another_point) or { panic(err) }
f.close()
f = os.open_file(tfile, 'r') or { panic(err) }
mut p := Point{}
f.read_struct(mut p) or { panic(err) }
f.close()
assert p == another_point
}
fn test_read_struct_at() {
mut f := os.open_file(tfile, 'w') or { panic(err) }
f.write([byte(1), 2, 3]) or { panic(err) }
f.write_struct(another_point) or { panic(err) }
f.close()
f = os.open_file(tfile, 'r') or { panic(err) }
mut p := Point{}
f.read_struct_at(mut p, 3) or { panic(err) }
f.close()
assert p == another_point
}
fn test_write_struct_at() {
mut f := os.open_file(tfile, 'w') or { panic(err) }
f.write_struct(extended_point) or { panic(err) }
f.write_struct_at(another_point, 3) or { panic(err) }
f.close()
f = os.open_file(tfile, 'r') or { panic(err) }
mut p := Point{}
f.read_struct_at(mut p, 3) or { panic(err) }
f.close()
assert p == another_point
}