add e2e test for enforcing enums in schema.

test/e2e/apimachinery/crd_publish_openapi.go

@@ -87,6 +87,12 @@ var _ = SIGDescribe("CustomResourcePublishOpenAPI [Privileged:ClusterAdmin]", fu
 			framework.Failf("failed to delete valid CR: %v", err)
 		}
 
+		ginkgo.By("client-side validation (kubectl create and apply) rejects request with value outside defined enum values")
+		badEnumValueCR := fmt.Sprintf(`{%s,"spec":{"bars":[{"name":"test-bar", "feeling":"NonExistentValue"}]}}`, meta)
+		if _, err := framework.RunKubectlInput(f.Namespace.Name, badEnumValueCR, ns, "create", "-f", "-"); err == nil || !strings.Contains(err.Error(), `Unsupported value: "NonExistentValue"`) {
+			framework.Failf("unexpected no error when creating CR with unknown enum value: %v", err)
+		}
+
 		ginkgo.By("client-side validation (kubectl create and apply) rejects request with unknown properties when disallowed by the schema")
 		unknownCR := fmt.Sprintf(`{%s,"spec":{"foo":true}}`, meta)
 		if _, err := framework.RunKubectlInput(f.Namespace.Name, unknownCR, ns, "create", "-f", "-"); err == nil || !strings.Contains(err.Error(), `unknown field "foo"`) {
@@ -741,6 +747,12 @@ properties:
             age:
               description: Age of Bar.
               type: string
+            feeling:
+              description: Whether Bar is feeling great.
+              type: string
+              enum:
+              - Great
+              - Down
             bazs:
               description: List of Bazs.
               items: