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 <tero.saarni@est.tech> Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>

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: