add integration test

test/integration/apiserver/BUILD

@@ -11,6 +11,7 @@ go_test(
     srcs = [
         "apiserver_test.go",
         "main_test.go",
+        "max_request_body_bytes_test.go",
         "patch_test.go",
         "print_test.go",
     ],
@@ -19,6 +20,7 @@ go_test(
         "integration",
     ],
     deps = [
+        "//cmd/kube-apiserver/app/options:go_default_library",
         "//pkg/api/legacyscheme:go_default_library",
         "//pkg/kubectl/cmd/util:go_default_library",
         "//pkg/master:go_default_library",

test/integration/apiserver/max_request_body_bytes_test.go

@@ -0,0 +1,101 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package apiserver
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
+	"k8s.io/kubernetes/test/integration/framework"
+)
+
+// Tests that the apiserver limits the resource size in write operations.
+func TestMaxResourceSize(t *testing.T) {
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	clientSet, _ := framework.StartTestServer(t, stopCh, framework.TestServerSetup{
+		ModifyServerRunOptions: func(opts *options.ServerRunOptions) {
+			opts.GenericServerRunOptions.MaxRequestBodyBytes = 1024 * 1024
+		},
+	})
+
+	hugeData := []byte(strings.Repeat("x", 1024*1024+1))
+
+	c := clientSet.CoreV1().RESTClient()
+	t.Run("Create should limit the request body size", func(t *testing.T) {
+		err := c.Post().AbsPath(fmt.Sprintf("/api/v1/namespaces/default/pods")).
+			Body(hugeData).Do().Error()
+		if err == nil {
+			t.Fatalf("unexpected no error")
+		}
+		if !errors.IsRequestEntityTooLargeError(err) {
+			t.Errorf("expected requested entity too large err, got %v", err)
+
+		}
+	})
+
+	// Create a secret so we can update/patch/delete it.
+	secret := &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "test",
+		},
+	}
+	_, err := clientSet.CoreV1().Secrets("default").Create(secret)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Run("Update should limit the request body size", func(t *testing.T) {
+		err = c.Put().AbsPath(fmt.Sprintf("/api/v1/namespaces/default/secrets/test")).
+			Body(hugeData).Do().Error()
+		if err == nil {
+			t.Fatalf("unexpected no error")
+		}
+		if !errors.IsRequestEntityTooLargeError(err) {
+			t.Errorf("expected requested entity too large err, got %v", err)
+
+		}
+	})
+	t.Run("Patch should limit the request body size", func(t *testing.T) {
+		err = c.Patch(types.JSONPatchType).AbsPath(fmt.Sprintf("/api/v1/namespaces/default/secrets/test")).
+			Body(hugeData).Do().Error()
+		if err == nil {
+			t.Fatalf("unexpected no error")
+		}
+		if !errors.IsRequestEntityTooLargeError(err) {
+			t.Errorf("expected requested entity too large err, got %v", err)
+
+		}
+	})
+	t.Run("Delete should limit the request body size", func(t *testing.T) {
+		err = c.Delete().AbsPath(fmt.Sprintf("/api/v1/namespaces/default/secrets/test")).
+			Body(hugeData).Do().Error()
+		if err == nil {
+			t.Fatalf("unexpected no error")
+		}
+		if !errors.IsRequestEntityTooLargeError(err) {
+			t.Errorf("expected requested entity too large err, got %v", err)
+
+		}
+	})
+}