add tests for fswatcher package

internal/fswatcher/event.go

@@ -2,20 +2,18 @@ package fswatcher
 
 import (
 	"fmt"
-
-	"github.com/dominicbreuker/pspy/internal/fswatcher/inotify"
 )
 
-func parseEvents(i *inotify.Inotify, dataCh chan []byte, eventCh chan string, errCh chan error) {
+func parseEvents(i Inotify, dataCh chan []byte, eventCh chan string, errCh chan error) {
 	for buf := range dataCh {
 		var ptr uint32
 		for len(buf[ptr:]) > 0 {
 			event, size, err := i.ParseNextEvent(buf[ptr:])
+			ptr += size
 			if err != nil {
 				errCh <- fmt.Errorf("parsing events: %v", err)
 				continue
 			}
-			ptr += size
 			eventCh <- fmt.Sprintf("%20s | %s", event.Op, event.Name)
 		}
 	}