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Copy pathserial_test.go
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153 lines (135 loc) · 3.82 KB
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package main
import (
"context"
"errors"
"io"
"sync"
"testing"
"time"
"github.com/datumbrain/nulltypes"
"go.bug.st/serial/enumerator"
)
func TestFindUSBSerialPortReturnsFirstVIDPIDMatch(t *testing.T) {
ports := []*enumerator.PortDetails{
{Name: "non-usb", VID: "1234", PID: "5678"},
{Name: "first", IsUSB: true, VID: "1234", PID: "abcd"},
{Name: "second", IsUSB: true, VID: "1234", PID: "ABCD"},
}
portName, err := findUSBSerialPort(ports, 0x1234, 0xABCD)
if err != nil {
t.Fatal(err)
}
if portName != "first" {
t.Fatalf("portName = %q, want first", portName)
}
}
func TestFindUSBSerialPortReportsNoMatch(t *testing.T) {
_, err := findUSBSerialPort([]*enumerator.PortDetails{
{Name: "other", IsUSB: true, VID: "1234", PID: "5678"},
}, 0xAAAA, 0xBBBB)
if err == nil {
t.Fatal("findUSBSerialPort succeeded without a matching port")
}
}
func TestResolveSerialPortKeepsExplicitPort(t *testing.T) {
portName, err := resolveSerialPort("explicit-port")
if err != nil {
t.Fatal(err)
}
if portName != "explicit-port" {
t.Fatalf("portName = %q, want explicit-port", portName)
}
}
func TestValidateSerialWriteRejectsPartialWrite(t *testing.T) {
if err := validateSerialWrite(2, 3, nil); !errors.Is(err, io.ErrShortWrite) {
t.Fatalf("error = %v, want io.ErrShortWrite", err)
}
if err := validateSerialWrite(3, 3, nil); err != nil {
t.Fatalf("complete write failed: %v", err)
}
}
func TestNormalizeSerialResponseDoesNotFabricateAcknowledgement(t *testing.T) {
if got := normalizeSerialResponse(""); got != "" {
t.Fatalf("empty response = %q, want empty", got)
}
for _, response := range []string{"Busy\n", "Blocked\n", "Invalid\n"} {
if got := normalizeSerialResponse(response); got != response {
t.Errorf("response %q changed to %q", response, got)
}
}
}
func TestSendrecvReceivesItsOwnResponse(t *testing.T) {
requests := make(chan serialRequest)
go func() {
request := <-requests
if request.command != "~U" {
t.Errorf("command = %q, want ~U", request.command)
}
request.respond(" ~A\n")
}()
response, err := sendrecvWithTimeout(context.Background(), "~U", requests, time.Second)
if err != nil {
t.Fatal(err)
}
if response != "~A" {
t.Fatalf("response = %q, want ~A", response)
}
}
func TestSendrecvTimesOutWhileWaitingForResponse(t *testing.T) {
requests := make(chan serialRequest)
accepted := make(chan struct{})
go func() {
<-requests
close(accepted)
}()
_, err := sendrecvWithTimeout(context.Background(), "~U", requests, 20*time.Millisecond)
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatalf("error = %v, want context deadline exceeded", err)
}
<-accepted
}
func TestPerioderInvalidatesTemperatureWhenHeartbeatFails(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
settings := &Settings{}
var mu sync.RWMutex
active := true
temperature := nulltypes.NullFloat64{Float64: 42.5, Valid: true}
requests := make(chan serialRequest)
done := make(chan struct{})
go func() {
perioder(ctx, settings, &mu, requests, &active, &temperature)
close(done)
}()
select {
case request := <-requests:
if request.command != "~U" {
t.Fatalf("command = %q, want ~U", request.command)
}
request.respond("")
case <-time.After(3 * time.Second):
t.Fatal("perioder did not issue a heartbeat request")
}
deadline := time.After(time.Second)
for {
mu.RLock()
isActive := active
currentTemperature := temperature
mu.RUnlock()
isTemperatureValid := currentTemperature.Valid
if !isActive && !isTemperatureValid {
break
}
select {
case <-deadline:
t.Fatalf("heartbeat failure left stale state: active=%v temperature=%+v", isActive, currentTemperature)
case <-time.After(10 * time.Millisecond):
}
}
cancel()
select {
case <-done:
case <-time.After(time.Second):
t.Fatal("perioder did not stop after context cancellation")
}
}