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Edit: /opt/golang/1.22.0/src/html/entity_test.go

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package html

import (
	"testing"
	"unicode/utf8"
)

func init() {
	UnescapeString("") // force load of entity maps
}

func TestEntityLength(t *testing.T) {
	if len(entity) == 0 || len(entity2) == 0 {
		t.Fatal("maps not loaded")
	}

// We verify that the length of UTF-8 encoding of each value is <= 1 + len(key).
	// The +1 comes from the leading "&". This property implies that the length of
	// unescaped text is <= the length of escaped text.
	for k, v := range entity {
		if 1+len(k) < utf8.RuneLen(v) {
			t.Error("escaped entity &" + k + " is shorter than its UTF-8 encoding " + string(v))
		}
		if len(k) > longestEntityWithoutSemicolon && k[len(k)-1] != ';' {
			t.Errorf("entity name %s is %d characters, but longestEntityWithoutSemicolon=%d", k, len(k), longestEntityWithoutSemicolon)
		}
	}
	for k, v := range entity2 {
		if 1+len(k) < utf8.RuneLen(v[0])+utf8.RuneLen(v[1]) {
			t.Error("escaped entity &" + k + " is shorter than its UTF-8 encoding " + string(v[0]) + string(v[1]))
		}
	}
}

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