zig/std/io_test.zig

47 lines
1.6 KiB
Zig

const std = @import("index.zig");
const io = std.io;
const allocator = std.debug.global_allocator;
const Rand = std.rand.Rand;
const assert = std.debug.assert;
const mem = std.mem;
const os = std.os;
const builtin = @import("builtin");
test "write a file, read it, then delete it" {
var data: [1024]u8 = undefined;
var rng = Rand.init(1234);
rng.fillBytes(data[0..]);
const tmp_file_name = "temp_test_file.txt";
{
var file = try io.File.openWrite(tmp_file_name, allocator);
defer file.close();
var file_out_stream = io.FileOutStream.init(&file);
var buf_stream = io.BufferedOutStream.init(&file_out_stream.stream);
const st = &buf_stream.stream;
try st.print("begin");
try st.write(data[0..]);
try st.print("end");
try buf_stream.flush();
}
{
var file = try io.File.openRead(tmp_file_name, allocator);
defer file.close();
const file_size = try file.getEndPos();
const expected_file_size = "begin".len + data.len + "end".len;
assert(file_size == expected_file_size);
var file_in_stream = io.FileInStream.init(&file);
var buf_stream = io.BufferedInStream.init(&file_in_stream.stream);
const st = &buf_stream.stream;
const contents = try st.readAllAlloc(allocator, 2 * 1024);
defer allocator.free(contents);
assert(mem.eql(u8, contents[0.."begin".len], "begin"));
assert(mem.eql(u8, contents["begin".len..contents.len - "end".len], data));
assert(mem.eql(u8, contents[contents.len - "end".len ..], "end"));
}
try os.deleteFile(allocator, tmp_file_name);
}