1 files changed, 83 insertions, 0 deletions
diff --git a/resources/page/pages_prev_next_test.go b/resources/page/pages_prev_next_test.go
new file mode 100644
index 000000000..c39ad0603
--- /dev/null
+++ b/resources/page/pages_prev_next_test.go
@@ -0,0 +1,83 @@
+// 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 page
+
+import (
+	"testing"
+
+	"github.com/spf13/cast"
+	"github.com/stretchr/testify/assert"
+)
+
+type pagePNTestObject struct {
+	path   string
+	weight int
+	date   string
+}
+
+var pagePNTestSources = []pagePNTestObject{
+	{"/section1/testpage1.md", 5, "2012-04-06"},
+	{"/section1/testpage2.md", 4, "2012-01-01"},
+	{"/section1/testpage3.md", 3, "2012-04-06"},
+	{"/section2/testpage4.md", 2, "2012-03-02"},
+	{"/section2/testpage5.md", 1, "2012-04-06"},
+}
+
+func TestPrev(t *testing.T) {
+	t.Parallel()
+	pages := preparePageGroupTestPages(t)
+	assert.Equal(t, pages.Prev(pages[0]), pages[4])
+	assert.Equal(t, pages.Prev(pages[1]), pages[0])
+	assert.Equal(t, pages.Prev(pages[4]), pages[3])
+}
+
+func TestNext(t *testing.T) {
+	t.Parallel()
+	pages := preparePageGroupTestPages(t)
+	assert.Equal(t, pages.Next(pages[0]), pages[1])
+	assert.Equal(t, pages.Next(pages[1]), pages[2])
+	assert.Equal(t, pages.Next(pages[4]), pages[0])
+}
+
+func prepareWeightedPagesPrevNext(t *testing.T) WeightedPages {
+	w := WeightedPages{}
+
+	for _, src := range pagePNTestSources {
+		p := newTestPage()
+		p.path = src.path
+		p.weight = src.weight
+		p.date = cast.ToTime(src.date)
+		p.pubDate = cast.ToTime(src.date)
+		w = append(w, WeightedPage{Weight: p.weight, Page: p})
+	}
+
+	w.Sort()
+	return w
+}
+
+func TestWeightedPagesPrev(t *testing.T) {
+	t.Parallel()
+	w := prepareWeightedPagesPrevNext(t)
+	assert.Equal(t, w.Prev(w[0].Page), w[4].Page)
+	assert.Equal(t, w.Prev(w[1].Page), w[0].Page)
+	assert.Equal(t, w.Prev(w[4].Page), w[3].Page)
+}
+
+func TestWeightedPagesNext(t *testing.T) {
+	t.Parallel()
+	w := prepareWeightedPagesPrevNext(t)
+	assert.Equal(t, w.Next(w[0].Page), w[1].Page)
+	assert.Equal(t, w.Next(w[1].Page), w[2].Page)
+	assert.Equal(t, w.Next(w[4].Page), w[0].Page)
+}