v3_5_experimental: add validation, unit tests and error

Author: yasminvalim

config/v3_5_experimental/types/config_test.go

@@ -211,7 +211,7 @@ func TestConfigValidation(t *testing.T) {
 				},
 			},
 			out: errors.ErrPathConflictsParentDir,
-			at:  path.New("json", "storage", "links", 0, "path"),
+			at:  path.New("json", "storage", "links", 1, "path"),
 		},
 
 		// test 8: file path conflicts with directory path, should error
@@ -220,15 +220,14 @@ func TestConfigValidation(t *testing.T) {
 				Storage: Storage{
 					Files: []File{
 						{Node: Node{Path: "/foo/bar"}},
-						{Node: Node{Path: "/foo/bar"}},
 					},
 					Directories: []Directory{
 						{Node: Node{Path: "/foo/bar/baz"}},
 					},
 				},
 			},
 			out: errors.ErrPathConflictsParentDir,
-			at:  path.New("json", "storage", "directories", 0, "path"),
+			at:  path.New("json", "storage", "directories", 1, "path"),
 		},
 
 		// test 9: non-conflicting scenarios with systemd unit and systemd dropin file, should not error
@@ -302,7 +301,6 @@ func TestConfigValidation(t *testing.T) {
 			in: Config{
 				Storage: Storage{
 					Files: []File{
-						{Node: Node{Path: "/foo/bar"}},
 						{Node: Node{Path: "/foo/bar/baz"}},
 					},
 					Directories: []Directory{