chore: release v0.26.3

internal/ultrabeam/transport_test.go

@@ -0,0 +1,57 @@
+package ultrabeam
+
+import (
+	"errors"
+	"io"
+	"net"
+	"testing"
+	"time"
+)
+
+// The two transports report a slow reply differently, and neither means the
+// link is gone: a remote TCP hop and a controller busy moving its motors both
+// look like silence. Getting this wrong tears the connection down on every poll.
+func TestTransientRead(t *testing.T) {
+	if !transientRead(timeoutErr{}) {
+		t.Errorf("a TCP read timeout must be transient")
+	}
+	// A serial port that stays silent returns (0, nil) forever; bufio gives up
+	// after a hundred empty reads with ErrNoProgress.
+	if !transientRead(io.ErrNoProgress) {
+		t.Errorf("a silent serial port must be transient")
+	}
+	if transientRead(io.EOF) {
+		t.Errorf("EOF is the link closing, not a slow reply")
+	}
+	if transientRead(errors.New("access denied")) {
+		t.Errorf("an open failure is not a slow reply")
+	}
+}
+
+// open must refuse a configuration it cannot honour rather than dial nothing.
+func TestOpenRejectsEmptyConfig(t *testing.T) {
+	if _, err := New(Transport{Mode: "serial"}).open(); err == nil {
+		t.Errorf("serial with no COM port must fail")
+	}
+	if _, err := New(Transport{Mode: "tcp"}).open(); err == nil {
+		t.Errorf("tcp with no host must fail")
+	}
+}
+
+// A missing baud is the controller's default, not zero — serial.Open would
+// reject 0 and the operator would see "invalid speed" for a field they never
+// knew existed.
+func TestDefaultBaud(t *testing.T) {
+	if got := New(Transport{Mode: "serial", COM: "COM3"}).tr.Baud; got != 9600 {
+		t.Errorf("default baud = %d, want 9600", got)
+	}
+}
+
+type timeoutErr struct{}
+
+func (timeoutErr) Error() string   { return "i/o timeout" }
+func (timeoutErr) Timeout() bool   { return true }
+func (timeoutErr) Temporary() bool { return true }
+
+var _ net.Error = timeoutErr{}
+var _ = time.Second