1package util
 2
 3import (
 4	"strings"
 5	"testing"
 6)
 7
 8func TestTextWrap(t *testing.T) {
 9	cases := []struct {
10		Input, Output string
11		Lim           int
12	}{
13		// A simple word passes through.
14		{
15			"foo",
16			"foo",
17			4,
18		},
19		// Word breaking
20		{
21			"foobarbaz",
22			"foob\narba\nz",
23			4,
24		},
25		// Lines are broken at whitespace.
26		{
27			"foo bar baz",
28			"foo\nbar\nbaz",
29			4,
30		},
31		// Word breaking
32		{
33			"foo bars bazzes",
34			"foo\nbars\nbazz\nes",
35			4,
36		},
37		// A word that would run beyond the width is wrapped.
38		{
39			"fo sop",
40			"fo\nsop",
41			4,
42		},
43		// A tab counts as 4 characters.
44		{
45			"foo\nb\t r\n baz",
46			"foo\nb\n r\n baz",
47			4,
48		},
49		// Trailing whitespace is removed after used for wrapping.
50		// Runs of whitespace on which a line is broken are removed.
51		{
52			"foo    \nb   ar   ",
53			"foo\n\nb\nar\n",
54			4,
55		},
56		// An explicit line break at the end of the input is preserved.
57		{
58			"foo bar baz\n",
59			"foo\nbar\nbaz\n",
60			4,
61		},
62		// Explicit break are always preserved.
63		{
64			"\nfoo bar\n\n\nbaz\n",
65			"\nfoo\nbar\n\n\nbaz\n",
66			4,
67		},
68		// Complete example:
69		{
70			" This is a list: \n\n\t* foo\n\t* bar\n\n\n\t* baz  \nBAM    ",
71			" This\nis a\nlist:\n\n    *\nfoo\n    *\nbar\n\n\n    *\nbaz\nBAM\n",
72			6,
73		},
74	}
75
76	for i, tc := range cases {
77		actual, lines := TextWrap(tc.Input, tc.Lim)
78		if actual != tc.Output {
79			t.Fatalf("Case %d Input:\n\n`%s`\n\nExpected Output:\n\n`%s`\n\nActual Output:\n\n`%s`",
80				i, tc.Input, tc.Output, actual)
81		}
82
83		expected := len(strings.Split(tc.Output, "\n"))
84		if expected != lines {
85			t.Fatalf("Nb lines mismatch\nExpected:%d\nActual:%d",
86				expected, lines)
87		}
88	}
89}