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//go:build !windows
// Copyright (c) 2019, Google LLC All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tpmutil
import (
"fmt"
"net"
"testing"
"time"
)
// mockConn records the number of bytes that are read from it and written to it
// and tracks whether or not it has been closed.
type mockConn struct {
network string
path string
open bool
}
// dialMockConn returns a mockConn that holds the given network and path info.
func dialMockConn(network, path string) (net.Conn, error) {
return &mockConn{
network: network,
path: path,
open: true,
}, nil
}
// Read implements a mock version of Read.
func (mc *mockConn) Read(b []byte) (int, error) {
// Always read zeros into the bytes for the given length.
for i := range b {
b[i] = 0
}
return len(b), nil
}
// Write implements a mock version of Write.
func (mc *mockConn) Write(b []byte) (int, error) {
return len(b), nil
}
// Close implements a mock version of Close.
func (mc *mockConn) Close() error {
if !mc.open {
return fmt.Errorf("mockConn is already closed")
}
mc.open = false
return nil
}
// LocalAddr returns nil.
func (mc *mockConn) LocalAddr() net.Addr {
return nil
}
// RemoteAddr returns nil.
func (mc *mockConn) RemoteAddr() net.Addr {
return nil
}
// SetDeadline returns nil.
func (mc *mockConn) SetDeadline(_ time.Time) error {
return nil
}
// SetReadDeadline returns nil.
func (mc *mockConn) SetReadDeadline(_ time.Time) error {
return nil
}
// SetWriteDeadline returns nil.
func (mc *mockConn) SetWriteDeadline(_ time.Time) error {
return nil
}
func newMockEmulator() *EmulatorReadWriteCloser {
path := "/dev/null/fake"
rwc := NewEmulatorReadWriteCloser(path)
rwc.dialer = dialMockConn
return rwc
}
var (
input = []byte(`input`)
output = make([]byte, 1)
)
func TestEmulatorReadWriteCloserMultipleReads(t *testing.T) {
rwc := newMockEmulator()
n, err := rwc.Write(input)
if err != nil {
t.Errorf("failed to write: %v", err)
}
if n != len(input) {
t.Errorf("wrong number of bytes written: got %d, expected %d", n, len(input))
}
n, err = rwc.Read(output)
if err != nil {
t.Errorf("failed to read: %v", err)
}
if n != len(output) {
t.Errorf("wrong number of bytes read: got %d, expected %d", n, len(output))
}
n, err = rwc.Write(input)
if err != nil {
t.Errorf("failed to write: %v", err)
}
if n != len(input) {
t.Errorf("wrong number of bytes written: got %d, expected %d", n, len(input))
}
n, err = rwc.Read(output)
if err != nil {
t.Errorf("failed to read: %v", err)
}
if n != len(output) {
t.Errorf("wrong number of bytes read: got %d, expected %d", n, len(output))
}
}
func TestEmulatorReadWriteCloserClose(t *testing.T) {
rwc := newMockEmulator()
if err := rwc.Close(); err == nil {
t.Errorf("incorrectly closed a connection that hadn't been opened")
}
if _, err := rwc.Write(input); err != nil {
t.Errorf("failed to write: %v", err)
}
if err := rwc.Close(); err != nil {
t.Errorf("failed to close an open connection: %v", err)
}
if err := rwc.Close(); err == nil {
t.Errorf("incorrectly closed a connection that had already been closed")
}
}
func TestEmulatorReadWriteCloseReadAfterClose(t *testing.T) {
rwc := newMockEmulator()
if _, err := rwc.Write(input); err != nil {
t.Errorf("failed to write: %v", err)
}
if err := rwc.Close(); err != nil {
t.Errorf("failed to close the connection: %v", err)
}
if _, err := rwc.Read(output); err == nil {
t.Errorf("incorrectly read on a closed connection")
}
}
func TestEmulatorReadWriteCloserReadBeforeWrite(t *testing.T) {
rwc := newMockEmulator()
b := make([]byte, 1)
if _, err := rwc.Read(b); err == nil {
t.Errorf("incorrectly read on a connection before writing")
}
}
func TestEmulatorReadWriteCloserDoubleWrite(t *testing.T) {
rwc := newMockEmulator()
if _, err := rwc.Write(input); err != nil {
t.Errorf("failed to write: %v", err)
}
if _, err := rwc.Write(input); err == nil {
t.Errorf("incorrectly wrote a second time without reading in between")
}
}
func TestEmulatorReadWriteCloserDialerError(t *testing.T) {
rwc := newMockEmulator()
rwc.dialer = func(_, _ string) (net.Conn, error) { return nil, fmt.Errorf("invalid") }
if _, err := rwc.Write(input); err == nil {
t.Errorf("incorrectly wrote when the dialer returned an error")
}
}
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