Merge pull request #66111 from fntlnz/fieldpath-tests-improvement

Automatic merge from submit-queue (batch tested with PRs 66011, 66111, 66106, 66039, 65745). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

fieldpath: Add tests for missing cases

Tests some missing cases in `pkg/fieldpath`.

**Release note**:

```release-note
NONE
```


Signed-off-by: Lorenzo Fontana <lo@linux.com>

pkg/fieldpath/fieldpath_test.go

@@ -107,6 +107,28 @@ func TestExtractFieldPathAsString(t *testing.T) {
 			},
 			expectedValue: "1",
 		},
+		{
+			name:      "ok - uid",
+			fieldPath: "metadata.uid",
+			obj: &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					UID: "b70b3269-858e-12a8-9cf2-1232a194038a",
+				},
+			},
+			expectedValue: "b70b3269-858e-12a8-9cf2-1232a194038a",
+		},
+		{
+			name:      "ok - label",
+			fieldPath: "metadata.labels['something']",
+			obj: &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{
+						"something": "label value",
+					},
+				},
+			},
+			expectedValue: "label value",
+		},
 		{
 			name:      "invalid expression",
 			fieldPath: "metadata.whoops",
@@ -137,6 +159,12 @@ func TestExtractFieldPathAsString(t *testing.T) {
 			},
 			expectedMessageFragment: "invalid key subscript in metadata.labels",
 		},
+		{
+			name:      "invalid subscript",
+			fieldPath: "metadata.notexisting['something']",
+			obj:       &v1.Pod{},
+			expectedMessageFragment: "fieldPath \"metadata.notexisting['something']\" does not support subscript",
+		},
 	}
 
 	for _, tc := range cases {