pkg/crd: add a test for embedded/inline struct type alias

User tsaarni bumped into a panic when using embedded/inline field with a
type alias and that Alias types are enabled in Go. They thankfully
included a reproducer that is shipped in this patch from the issue
#1088.

Co-authored-by: Tero Saarni <[email protected]>
Signed-off-by: Mahe Tardy <[email protected]>

Author: mtardy

pkg/crd/testdata/cronjob_types.go

@@ -374,6 +374,17 @@ type CronJobSpec struct {
 
 	// This tests that selectable field.
 	SelectableFieldString string `json:"selectableFieldString,omitempty"`
+
+	// This tests that embedded struct, which is an alias type, is handled correctly.
+	InlineAlias `json:",inline"`
+}
+
+type InlineAlias = EmbeddedStruct
+
+// EmbeddedStruct is for testing that embedded struct is handled correctly when it is used through an alias type.
+type EmbeddedStruct struct {
+	// FromEmbedded is a field from the embedded struct that was used through an alias type.
+	FromEmbedded string `json:"fromEmbedded,omitempty"`
 }
 
 type StringAlias = string

pkg/crd/testdata/testdata.kubebuilder.io_cronjobs.yaml

@@ -234,6 +234,10 @@ spec:
                   Test that we can add a forbidden field using XValidation Reason and FieldPath.
                   The validation is applied to the spec struct itself and not the field.
                 type: integer
+              fromEmbedded:
+                description: FromEmbedded is a field from the embedded struct that
+                  was used through an alias type.
+                type: string
               hosts:
                 description: This tests string slice item validation.
                 items: