support custom configuration to main context of nginx config

test/e2e/settings/main_snippet.go

@@ -0,0 +1,43 @@
+/*
+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 settings
+
+import (
+	"strings"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("Main Snippet", func() {
+	f := framework.NewDefaultFramework("main-snippet")
+	mainSnippet := "main-snippet"
+
+	It("should add value of main-snippet setting to nginx config", func() {
+		expectedComment := "# main snippet"
+		err := f.UpdateNginxConfigMapData(mainSnippet, expectedComment)
+		Expect(err).NotTo(HaveOccurred())
+
+		err = f.WaitForNginxConfiguration(
+			func(cfg string) bool {
+				return strings.Contains(cfg, expectedComment)
+			})
+		Expect(err).NotTo(HaveOccurred())
+	})
+})