Test Add() on non-existent path (#546)

Ref: #144

diff --git a/fsnotify_test.go b/fsnotify_test.go
index 61070b3d9e5703ff9871713e5af2090c733960b5..9a4d986dce1135f25500763c4b9636a3cf621a88 100644 (file)
--- a/fsnotify_test.go
+++ b/fsnotify_test.go
@@ -3,6 +3,7 @@ package fsnotify
 import (
        "errors"
        "fmt"
+       "io/fs"
        "os"
        "path/filepath"
        "reflect"
@@ -11,6 +12,7 @@ import (
        "strings"
        "sync"
        "sync/atomic"
+       "syscall"
        "testing"
        "time"
 
@@ -1145,6 +1147,33 @@ func TestClose(t *testing.T) {
 }
 
 func TestAdd(t *testing.T) {
+       t.Run("doesn't exist", func(t *testing.T) {
+               t.Parallel()
+               tmp := t.TempDir()
+
+               w := newWatcher(t)
+               err := w.Add(join(tmp, "non-existent"))
+               if err == nil {
+                       t.Fatal("err is nil")
+               }
+
+               // Errors for this are inconsistent; should be fixed in v2. See #144
+               switch runtime.GOOS {
+               case "linux":
+                       if _, ok := err.(syscall.Errno); !ok {
+                               t.Errorf("wrong error type: %[1]T: %#[1]v", err)
+                       }
+               case "windows":
+                       if _, ok := err.(*os.SyscallError); !ok {
+                               t.Errorf("wrong error type: %[1]T: %#[1]v", err)
+                       }
+               default:
+                       if _, ok := err.(*fs.PathError); !ok {
+                               t.Errorf("wrong error type: %[1]T: %#[1]v", err)
+                       }
+               }
+       })
+
        t.Run("permission denied", func(t *testing.T) {
                if runtime.GOOS == "windows" {
                        t.Skip("chmod doesn't work on Windows") // See if we can make a file unreadable