1 files changed, 70 insertions, 0 deletions
diff --git a/metrics/metrics_test.go b/metrics/metrics_test.go
new file mode 100644
index 000000000..057d58662
--- /dev/null
+++ b/metrics/metrics_test.go
@@ -0,0 +1,70 @@
+// Copyright 2017 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 metrics
+
+import (
+	"html/template"
+	"strings"
+	"testing"
+
+	"github.com/gohugoio/hugo/resources/page"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestSimilarPercentage(t *testing.T) {
+	c := qt.New(t)
+
+	sentence := "this is some words about nothing, Hugo!"
+	words := strings.Fields(sentence)
+	for i, j := 0, len(words)-1; i < j; i, j = i+1, j-1 {
+		words[i], words[j] = words[j], words[i]
+	}
+	sentenceReversed := strings.Join(words, " ")
+
+	c.Assert(howSimilar("Hugo Rules", "Hugo Rules"), qt.Equals, 100)
+	c.Assert(howSimilar("Hugo Rules", "Hugo Rocks"), qt.Equals, 50)
+	c.Assert(howSimilar("The Hugo Rules", "The Hugo Rocks"), qt.Equals, 66)
+	c.Assert(howSimilar("The Hugo Rules", "The Hugo"), qt.Equals, 66)
+	c.Assert(howSimilar("The Hugo", "The Hugo Rules"), qt.Equals, 66)
+	c.Assert(howSimilar("Totally different", "Not Same"), qt.Equals, 0)
+	c.Assert(howSimilar(sentence, sentenceReversed), qt.Equals, 14)
+	c.Assert(howSimilar(template.HTML("Hugo Rules"), template.HTML("Hugo Rules")), qt.Equals, 100)
+	c.Assert(howSimilar(map[string]interface{}{"a": 32, "b": 33}, map[string]interface{}{"a": 32, "b": 33}), qt.Equals, 100)
+	c.Assert(howSimilar(map[string]interface{}{"a": 32, "b": 33}, map[string]interface{}{"a": 32, "b": 34}), qt.Equals, 0)
+
+}
+
+type testStruct struct {
+	Name string
+}
+
+func TestSimilarPercentageNonString(t *testing.T) {
+	c := qt.New(t)
+	c.Assert(howSimilar(page.NopPage, page.NopPage), qt.Equals, 100)
+	c.Assert(howSimilar(page.Pages{}, page.Pages{}), qt.Equals, 90)
+	c.Assert(howSimilar(testStruct{Name: "A"}, testStruct{Name: "B"}), qt.Equals, 0)
+	c.Assert(howSimilar(testStruct{Name: "A"}, testStruct{Name: "A"}), qt.Equals, 100)
+
+}
+
+func BenchmarkHowSimilar(b *testing.B) {
+	s1 := "Hugo is cool and " + strings.Repeat("fun ", 10) + "!"
+	s2 := "Hugo is cool and " + strings.Repeat("cool ", 10) + "!"
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		howSimilar(s1, s2)
+	}
+}