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package wordwrap
import (
"testing"
)
func TestWordWrap(t *testing.T) {
tt := []struct {
Input string
Expected string
Limit int
KeepNewlines bool
}{
// No-op, should pass through, including trailing whitespace:
{
"foobar\n ",
"foobar\n ",
0,
true,
},
// Nothing to wrap here, should pass through:
{
"foo",
"foo",
4,
true,
},
// A single word that is too long passes through.
// We do not break long words:
{
"foobarfoo",
"foobarfoo",
4,
true,
},
// Lines are broken at whitespace:
{
"foo bar foo",
"foo\nbar\nfoo",
4,
true,
},
// A hyphen is a valid breakpoint:
{
"foo-foobar",
"foo-\nfoobar",
4,
true,
},
// Space buffer needs to be emptied before breakpoints:
{
"foo --bar",
"foo --bar",
9,
true,
},
// Lines are broken at whitespace, even if words
// are too long. We do not break words:
{
"foo bars foobars",
"foo\nbars\nfoobars",
4,
true,
},
// A word that would run beyond the limit is wrapped:
{
"foo bar",
"foo\nbar",
5,
true,
},
// Whitespace that trails a line and fits the width
// passes through, as does whitespace prefixing an
// explicit line break. A tab counts as one character:
{
"foo\nb\t a\n bar",
"foo\nb\t a\n bar",
4,
true,
},
// Trailing whitespace is removed if it doesn't fit the width.
// Runs of whitespace on which a line is broken are removed:
{
"foo \nb ar ",
"foo\nb\nar",
4,
true,
},
// An explicit line break at the end of the input is preserved:
{
"foo bar foo\n",
"foo\nbar\nfoo\n",
4,
true,
},
// Explicit break are always preserved:
{
"\nfoo bar\n\n\nfoo\n",
"\nfoo\nbar\n\n\nfoo\n",
4,
true,
},
// Unless we ask them to be ignored:
{
"\nfoo bar\n\n\nfoo\n",
"foo\nbar\nfoo",
4,
false,
},
// Complete example:
{
" This is a list: \n\n\t* foo\n\t* bar\n\n\n\t* foo \nbar ",
" This\nis a\nlist: \n\n\t* foo\n\t* bar\n\n\n\t* foo\nbar",
6,
true,
},
// ANSI sequence codes don't affect length calculation:
{
"\x1B[38;2;249;38;114mfoo\x1B[0m\x1B[38;2;248;248;242m \x1B[0m\x1B[38;2;230;219;116mbar\x1B[0m",
"\x1B[38;2;249;38;114mfoo\x1B[0m\x1B[38;2;248;248;242m \x1B[0m\x1B[38;2;230;219;116mbar\x1B[0m",
7,
true,
},
// ANSI control codes don't get wrapped:
{
"\x1B[38;2;249;38;114m(\x1B[0m\x1B[38;2;248;248;242mjust another test\x1B[38;2;249;38;114m)\x1B[0m",
"\x1B[38;2;249;38;114m(\x1B[0m\x1B[38;2;248;248;242mjust\nanother\ntest\x1B[38;2;249;38;114m)\x1B[0m",
3,
true,
},
}
for i, tc := range tt {
f := NewWriter(tc.Limit)
f.KeepNewlines = tc.KeepNewlines
_, err := f.Write([]byte(tc.Input))
if err != nil {
t.Error(err)
}
f.Close()
if f.String() != tc.Expected {
t.Errorf("Test %d, expected:\n\n`%s`\n\nActual Output:\n\n`%s`", i, tc.Expected, f.String())
}
}
}
func TestWordWrapString(t *testing.T) {
actual := String("foo bar", 3)
expected := "foo\nbar"
if actual != expected {
t.Errorf("expected:\n\n`%s`\n\nActual Output:\n\n`%s`", expected, actual)
}
}
|
