github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/html/entity_test.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package html
     6  
     7  import (
     8  	"testing"
     9  	"unicode/utf8"
    10  )
    11  
    12  func init() {
    13  	UnescapeString("") // force load of entity maps
    14  }
    15  
    16  func TestEntityLength(t *testing.T) {
    17  	if len(entity) == 0 || len(entity2) == 0 {
    18  		t.Fatal("maps not loaded")
    19  	}
    20  
    21  	// We verify that the length of UTF-8 encoding of each value is <= 1 + len(key).
    22  	// The +1 comes from the leading "&". This property implies that the length of
    23  	// unescaped text is <= the length of escaped text.
    24  	for k, v := range entity {
    25  		if 1+len(k) < utf8.RuneLen(v) {
    26  			t.Error("escaped entity &" + k + " is shorter than its UTF-8 encoding " + string(v))
    27  		}
    28  		if len(k) > longestEntityWithoutSemicolon && k[len(k)-1] != ';' {
    29  			t.Errorf("entity name %s is %d characters, but longestEntityWithoutSemicolon=%d", k, len(k), longestEntityWithoutSemicolon)
    30  		}
    31  	}
    32  	for k, v := range entity2 {
    33  		if 1+len(k) < utf8.RuneLen(v[0])+utf8.RuneLen(v[1]) {
    34  			t.Error("escaped entity &" + k + " is shorter than its UTF-8 encoding " + string(v[0]) + string(v[1]))
    35  		}
    36  	}
    37  }