"strings"
	"sync"
	"testing"
)

// TestCopyUnixpacket tests that we can use bufio when copying
// across a unixpacket socket. This used to fail due to an unnecessary
// empty Write call that was interpreted as an EOF.
func TestCopyUnixpacket(t *testing.T) {
	tmpDir := t.TempDir()
	socket := filepath.Join(tmpDir, "unixsock")

	// Start a unixpacket server.
	addr := &net.UnixAddr{
		Name: socket,
		Net:  "unixpacket",
	}

          .put("\\n line break", "hello\nworld")
          .put("\\r line break", "hello\rworld")
          .put("\\r\\n line break", "hello\r\nworld")
          .put("\\n at EOF", "hello\nworld\n")
          .put("\\r at EOF", "hello\nworld\r")
          .put("lorem ipsum", LOREM_IPSUM)
          .buildOrThrow();

  protected final F factory;
  protected final T data;
  protected final T expected;

	n.firstToDisconnect = time.Time{}
}

// Reader to read random data.
type netperfReader struct {
	n   uint64
	eof chan struct{}
	buf []byte
}

func (m *netperfReader) Read(b []byte) (int, error) {
	select {
	case <-m.eof:
		return 0, io.EOF
	default:
	}
	n := copy(b, m.buf)
	atomic.AddUint64(&m.n, uint64(n))
	return n, nil
}

Create new canned policy file `adminManageUser.json`. This policy enables admin user to
manage other users.

```json
cat > adminManageUser.json << EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "admin:CreateUser",
        "admin:DeleteUser",
        "admin:ConfigUpdate"
      ],
      "Effect": "Allow",

        }

        while (have < fraglen) {
            final int r = this.handle.recv(inB, have, fraglen - have);
            if (r == 0) {
                throw new IOException("Unexpected EOF");
            }
            have += r;
        }

        return have;
    }

    @Override
    protected void doSendFragment(final byte[] buf, final int off, final int length) throws IOException {

    void testReadEOF() throws SmbException {
        // Mock the read operation to return EOF
        doAnswer(new Answer<Void>() {
            @Override
            public Void answer(InvocationOnMock invocation) throws Throwable {
                SmbComReadAndXResponse response = invocation.getArgument(1);
                response.dataLength = 0; // EOF
                return null;
            }

            assertEquals(3, skipped);
        } catch (IOException e) {
            // This is also acceptable behavior - skip may fail when it runs out of data
            assertTrue(e.getMessage().contains("unexpected EOF"));
        }
    }

    @Test
    @DisplayName("Keep-alive packets are transparently skipped")
    void keepAlivePacketsAreSkipped() throws IOException {

	}
	err := s.Err()
	if err != testError {
		t.Fatalf("expected %q got %v", testError, err)
	}
}

// Test that an EOF is overridden by a user-generated scan error.
func TestErrAtEOF(t *testing.T) {
	s := NewScanner(strings.NewReader("1 2 33"))
	// This splitter will fail on last entry, after s.err==EOF.
	split := func(data []byte, atEOF bool) (advance int, token []byte, err error) {
		advance, token, err = ScanWords(data, atEOF)

		r.readerWg.Wait()
		r.close = nil
	}
	r.recordsRead = len(r.current)
	if r.err == nil {
		r.err = io.EOF
	}
	return r.readCloser.Close()
}

// nextSplit will attempt to skip a number of bytes and
// return the buffer until the next newline occurs.
// The last block will be sent along with an io.EOF.
func (r *Reader) nextSplit(skip int, dst []byte) ([]byte, error) {
	if cap(dst) < skip {

		t.Errorf(`Peek(4) on "abcd", EOF = %q, %v; want "abcd", nil`, string(s), err)
	}
	if n, err := buf.Read(p[0:5]); string(p[0:n]) != "abcd" || err != nil {
		t.Fatalf("Read after peek = %q, %v; want abcd, EOF", p[0:n], err)
	}
	if n, err := buf.Read(p[0:1]); string(p[0:n]) != "" || err != io.EOF {
		t.Fatalf(`second Read after peek = %q, %v; want "", EOF`, p[0:n], err)
	}
}

type dataAndEOFReader string