@safe unittest{    import std.outbuffer;         OutBuffer buf = new OutBuffer();        buf.write(cast(ubyte) 1);        buf.align2();        assert(buf.toBytes() == "\x01\x00");        buf.write(cast(ubyte) 2);        buf.align4();        assert(buf.toBytes() == "\x01\x00\x02\x00");        buf.write(cast(ubyte) 3);        buf.alignSize(8);        assert(buf.toBytes() == "\x01\x00\x02\x00\x03\x00\x00\x00");    } @safe unittest{    import std.outbuffer;         OutBuffer buf = new OutBuffer();        buf.write(cast(ubyte) 1);        buf.align2(0x55);        assert(buf.toBytes() == "\x01\x55");        buf.write(cast(ubyte) 2);        buf.align4(0x55);        assert(buf.toBytes() == "\x01\x55\x02\x55");        buf.write(cast(ubyte) 3);        buf.alignSize(8, 0x55);        assert(buf.toBytes() == "\x01\x55\x02\x55\x03\x55\x55\x55");    } @safe unittest{    import std.outbuffer;         OutBuffer b = new OutBuffer();        b.writef("a%sb", 16);        assert(b.toString() == "a16b");    } @safe unittest{    import std.outbuffer;         OutBuffer b = new OutBuffer();        b.writef!"a%sb"(16);        assert(b.toString() == "a16b");    } @safe unittest{    import std.outbuffer;         OutBuffer b = new OutBuffer();        b.writefln("a%sb", 16);        assert(b.toString() == "a16b\n");    } @safe unittest{    import std.outbuffer;         OutBuffer b = new OutBuffer();        b.writefln!"a%sb"(16);        assert(b.toString() == "a16b\n");    } @safe unittest{    import std.outbuffer;     import std.string : cmp;     OutBuffer buf = new OutBuffer();     assert(buf.offset == 0);    buf.write("hello");    buf.write(cast(byte) 0x20);    buf.write("world");    buf.writef(" %d", 62665);    assert(cmp(buf.toString(), "hello world 62665") == 0);     buf.clear();    assert(cmp(buf.toString(), "") == 0);    buf.write("New data");    assert(cmp(buf.toString(),"New data") == 0);}