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// Copyright (c) 2014 Couchbase, Inc.
//
// 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 search
import (
"testing"
)
func TestLevenshteinDistance(t *testing.T) {
tests := []struct {
a string
b string
dist int
}{
{
"water",
"atec",
2,
},
{
"water",
"aphex",
4,
},
}
for _, test := range tests {
actual := LevenshteinDistance(test.a, test.b)
if actual != test.dist {
t.Errorf("expected %d, got %d for %s and %s", test.dist, actual, test.a, test.b)
}
}
}
func TestLevenshteinDistanceMax(t *testing.T) {
tests := []struct {
a string
b string
max int
dist int
exceeded bool
}{
{
a: "water",
b: "atec",
max: 1,
dist: 1,
exceeded: true,
},
{
a: "water",
b: "christmas",
max: 3,
dist: 3,
exceeded: true,
},
{
a: "water",
b: "water",
max: 1,
dist: 0,
exceeded: false,
},
}
for _, test := range tests {
actual, exceeded := LevenshteinDistanceMax(test.a, test.b, test.max)
if actual != test.dist || exceeded != test.exceeded {
t.Errorf("expected %d %t, got %d %t for %s and %s", test.dist, test.exceeded, actual, exceeded, test.a, test.b)
}
}
}
// 5 terms that are less than 2
// 5 terms that are more than 2
var benchmarkTerms = []string{
"watex",
"aters",
"wayer",
"wbter",
"yater",
"christmas",
"waterwaterwater",
"watcatdogfish",
"q",
"couchbase",
}
func BenchmarkLevenshteinDistance(b *testing.B) {
a := "water"
for i := 0; i < b.N; i++ {
for _, t := range benchmarkTerms {
LevenshteinDistance(a, t)
}
}
}
func BenchmarkLevenshteinDistanceMax(b *testing.B) {
a := "water"
for i := 0; i < b.N; i++ {
for _, t := range benchmarkTerms {
LevenshteinDistanceMax(a, t, 2)
}
}
}
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