Fix paginator refresh on server change

Fixes #5838

hugolib/hugo_sites_rebuild_test.go

@@ -0,0 +1,77 @@
+// Copyright 2019 The Hugo Authors. All rights reserved.
+//
+// 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 hugolib
+
+import (
+	"testing"
+)
+
+func TestSitesRebuild(t *testing.T) {
+
+	configFile := `
+baseURL = "https://example.com"
+title = "Rebuild this"
+contentDir = "content"
+
+
+`
+
+	contentFilename := "content/blog/page1.md"
+
+	b := newTestSitesBuilder(t).WithConfigFile("toml", configFile)
+
+	// To simulate https://github.com/gohugoio/hugo/issues/5838, the home page
+	// needs a content page.
+	b.WithContent("content/_index.md", `---
+title: Home, Sweet Home!
+---
+
+`)
+
+	b.WithContent(contentFilename, `
+---
+title: "Page 1"
+summary: "Initial summary"
+paginate: 3
+---
+
+Content.
+
+`)
+
+	b.WithTemplatesAdded("index.html", `
+{{ range (.Paginate .Site.RegularPages).Pages }}
+* Page: {{ .Title }}|Summary: {{ .Summary }}|Content: {{ .Content }}
+{{ end }}
+`)
+
+	b.Running().Build(BuildCfg{})
+
+	b.AssertFileContent("public/index.html", "* Page: Page 1|Summary: Initial summary|Content: <p>Content.</p>")
+
+	b.EditFiles(contentFilename, `
+---
+title: "Page 1 edit"
+summary: "Edited summary"
+---
+
+Edited content.
+
+`)
+
+	b.Build(BuildCfg{})
+
+	b.AssertFileContent("public/index.html", "* Page: Page 1 edit|Summary: Edited summary|Content: <p>Edited content.</p>")
+
+}