lib/fs: Fix and update error about inotify watch limit (fixes #4833) (#4835)

lib/fs/basicfs_test.go

@@ -7,14 +7,12 @@
 package fs
 
 import (
-	"errors"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
 	"sort"
 	"strings"
-	"syscall"
 	"testing"
 	"time"
 )
@@ -483,23 +481,3 @@ func TestRooted(t *testing.T) {
 		}
 	}
 }
-
-func TestWatchErrorLinuxInterpretation(t *testing.T) {
-	if runtime.GOOS != "linux" {
-		t.Skip("testing of linux specific error codes")
-	}
-
-	var errTooManyFiles syscall.Errno = 24
-	var errNoSpace syscall.Errno = 28
-
-	if !reachedMaxUserWatches(errTooManyFiles) {
-		t.Errorf("Errno %v should be recognised to be about inotify limits.", errTooManyFiles)
-	}
-	if !reachedMaxUserWatches(errNoSpace) {
-		t.Errorf("Errno %v should be recognised to be about inotify limits.", errNoSpace)
-	}
-	err := errors.New("Another error")
-	if reachedMaxUserWatches(err) {
-		t.Errorf("This error does not concern inotify limits: %#v", err)
-	}
-}