Add integration test for kube-apiextensions-server.

Check if integers are present after decoding.
Originally an issue for TPRs: #30213

staging/src/k8s.io/kube-apiextensions-server/test/integration/BUILD

@@ -23,6 +23,7 @@ go_test(
         "//vendor/k8s.io/apimachinery/pkg/api/meta:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/watch:go_default_library",
         "//vendor/k8s.io/client-go/dynamic:go_default_library",
         "//vendor/k8s.io/kube-apiextensions-server/pkg/apis/apiextensions/v1alpha1:go_default_library",

staging/src/k8s.io/kube-apiextensions-server/test/integration/basic_test.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/watch"
 	"k8s.io/client-go/dynamic"
 	apiextensionsv1alpha1 "k8s.io/kube-apiextensions-server/pkg/apis/apiextensions/v1alpha1"
@@ -333,3 +334,48 @@ func TestSelfLink(t *testing.T) {
 	// TODO add test for cluster scoped self-link when its available
 
 }
+
+func TestPreserveInt(t *testing.T) {
+	stopCh, apiExtensionClient, clientPool, err := testserver.StartDefaultServer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer close(stopCh)
+
+	noxuDefinition := testserver.NewNoxuCustomResourceDefinition(apiextensionsv1alpha1.ClusterScoped)
+	noxuVersionClient, err := testserver.CreateNewCustomResourceDefinition(noxuDefinition, apiExtensionClient, clientPool)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ns := "not-the-default"
+	noxuNamespacedResourceClient := noxuVersionClient.Resource(&metav1.APIResource{
+		Name:       noxuDefinition.Spec.Names.Plural,
+		Namespaced: true,
+	}, ns)
+
+	noxuInstanceToCreate := testserver.NewNoxuInstance(ns, "foo")
+	createdNoxuInstance, err := noxuNamespacedResourceClient.Create(noxuInstanceToCreate)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	originalJSON, err := runtime.Encode(unstructured.UnstructuredJSONScheme, createdNoxuInstance)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	gottenNoxuInstance, err := runtime.Decode(unstructured.UnstructuredJSONScheme, originalJSON)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Check if int is preserved.
+	unstructuredObj := gottenNoxuInstance.(*unstructured.Unstructured).Object
+	num := unstructuredObj["num"].(map[string]interface{})
+	num1 := num["num1"].(int64)
+	num2 := num["num2"].(int64)
+	if num1 != 9223372036854775807 || num2 != 1000000 {
+		t.Errorf("Expected %v, got %v, %v", `9223372036854775807, 1000000`, num1, num2)
+	}
+}

staging/src/k8s.io/kube-apiextensions-server/test/integration/testserver/resources.go

@@ -59,6 +59,10 @@ func NewNoxuInstance(namespace, name string) *unstructured.Unstructured {
 			"content": map[string]interface{}{
 				"key": "value",
 			},
+			"num": map[string]interface{}{
+				"num1": 9223372036854775807,
+				"num2": 1000000,
+			},
 		},
 	}
 }