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// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
// https://github.com/sergi/go-diff
// See the included LICENSE file for license details.
//
// go-diff is a Go implementation of Google's Diff, Match, and Patch library
// Original library is Copyright (c) 2006 Google Inc.
// http://code.google.com/p/google-diff-match-patch/
package diffmatchpatch
import (
"fmt"
"testing"
"github.com/stretchr/testify/assert"
)
func TestMatchAlphabet(t *testing.T) {
type TestCase struct {
Pattern string
Expected map[byte]int
}
dmp := New()
for i, tc := range []TestCase{
{
Pattern: "abc",
Expected: map[byte]int{
'a': 4,
'b': 2,
'c': 1,
},
},
{
Pattern: "abcaba",
Expected: map[byte]int{
'a': 37,
'b': 18,
'c': 8,
},
},
} {
actual := dmp.MatchAlphabet(tc.Pattern)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
}
}
func TestMatchBitap(t *testing.T) {
type TestCase struct {
Name string
Text string
Pattern string
Location int
Expected int
}
dmp := New()
dmp.MatchDistance = 100
dmp.MatchThreshold = 0.5
for i, tc := range []TestCase{
{"Exact match #1", "abcdefghijk", "fgh", 5, 5},
{"Exact match #2", "abcdefghijk", "fgh", 0, 5},
{"Fuzzy match #1", "abcdefghijk", "efxhi", 0, 4},
{"Fuzzy match #2", "abcdefghijk", "cdefxyhijk", 5, 2},
{"Fuzzy match #3", "abcdefghijk", "bxy", 1, -1},
{"Overflow", "123456789xx0", "3456789x0", 2, 2},
{"Before start match", "abcdef", "xxabc", 4, 0},
{"Beyond end match", "abcdef", "defyy", 4, 3},
{"Oversized pattern", "abcdef", "xabcdefy", 0, 0},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
dmp.MatchThreshold = 0.4
for i, tc := range []TestCase{
{"Threshold #1", "abcdefghijk", "efxyhi", 1, 4},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
dmp.MatchThreshold = 0.3
for i, tc := range []TestCase{
{"Threshold #2", "abcdefghijk", "efxyhi", 1, -1},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
dmp.MatchThreshold = 0.0
for i, tc := range []TestCase{
{"Threshold #3", "abcdefghijk", "bcdef", 1, 1},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
dmp.MatchThreshold = 0.5
for i, tc := range []TestCase{
{"Multiple select #1", "abcdexyzabcde", "abccde", 3, 0},
{"Multiple select #2", "abcdexyzabcde", "abccde", 5, 8},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
// Strict location.
dmp.MatchDistance = 10
for i, tc := range []TestCase{
{"Distance test #1", "abcdefghijklmnopqrstuvwxyz", "abcdefg", 24, -1},
{"Distance test #2", "abcdefghijklmnopqrstuvwxyz", "abcdxxefg", 1, 0},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
// Loose location.
dmp.MatchDistance = 1000
for i, tc := range []TestCase{
{"Distance test #3", "abcdefghijklmnopqrstuvwxyz", "abcdefg", 24, 0},
} {
actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
}
func TestMatchMain(t *testing.T) {
type TestCase struct {
Name string
Text1 string
Text2 string
Location int
Expected int
}
dmp := New()
for i, tc := range []TestCase{
{"Equality", "abcdef", "abcdef", 1000, 0},
{"Null text", "", "abcdef", 1, -1},
{"Null pattern", "abcdef", "", 3, 3},
{"Exact match", "abcdef", "de", 3, 3},
{"Beyond end match", "abcdef", "defy", 4, 3},
{"Oversized pattern", "abcdef", "abcdefy", 0, 0},
} {
actual := dmp.MatchMain(tc.Text1, tc.Text2, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
}
dmp.MatchThreshold = 0.7
for i, tc := range []TestCase{
{"Complex match", "I am the very model of a modern major general.", " that berry ", 5, 4},
} {
actual := dmp.MatchMain(tc.Text1, tc.Text2, tc.Location)
assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
}
}
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