EndpointInfo tests

usb/config.go

@@ -42,7 +42,7 @@ func (e EndpointInfo) Direction() EndpointDirection {
 }
 
 func (e EndpointInfo) String() string {
-	return fmt.Sprintf("Endpoint %d %-3s %s - %s %s [%d %d]",
+	return fmt.Sprintf("Endpoint #%d %-3s %s - %s %s [%d %d]",
 		e.Number(), e.Direction(), e.TransferType(),
 		IsoSyncType(e.Attributes)&ISO_SYNC_TYPE_MASK,
 		IsoUsageType(e.Attributes)&ISO_USAGE_TYPE_MASK,

usb/config_test.go

@@ -0,0 +1,32 @@
+package usb
+
+import "testing"
+
+func TestEndpointInfo(t *testing.T) {
+	for _, tc := range []struct {
+		ep   EndpointInfo
+		want string
+	}{
+		{
+			ep: EndpointInfo{
+				Address:       0x86,
+				Attributes:    0x02,
+				MaxPacketSize: 512,
+			},
+			want: "Endpoint #6 IN  bulk - unsynchronized data [512 0]",
+		},
+		{
+			ep: EndpointInfo{
+				Address:       0x02,
+				Attributes:    0x05,
+				MaxPacketSize: 512,
+				MaxIsoPacket:  512,
+			},
+			want: "Endpoint #2 OUT isochronous - asynchronous data [512 512]",
+		},
+	} {
+		if got := tc.ep.String(); got != tc.want {
+			t.Errorf("%#v.String(): got %q, want %q", tc.ep, got, tc.want)
+		}
+	}
+}