| 🛟 Updated. 28d5985 k33g 5h ago | 1 | package buffer |
| 2 | |
| 3 | import "testing" |
| 4 | |
| 5 | func TestNewBufferHoldsOneEmptyLine(t *testing.T) { |
| 6 | b := New() |
| 7 | |
| 8 | if got := b.LineCount(); got != 1 { |
| 9 | t.Fatalf("LineCount() = %d, want 1", got) |
| 10 | } |
| 11 | if got := b.Line(0); got != "" { |
| 12 | t.Errorf("Line(0) = %q, want empty", got) |
| 13 | } |
| 14 | if b.Modified() { |
| 15 | t.Error("a fresh buffer must not be marked modified") |
| 16 | } |
| 17 | } |
| 18 | |
| 19 | func TestNewFromStringSplitsOnLineFeeds(t *testing.T) { |
| 20 | b := NewFromString("package main\n\nfunc main() {}\n") |
| 21 | |
| 22 | if got := b.LineCount(); got != 3 { |
| 23 | t.Fatalf("LineCount() = %d, want 3 (the trailing newline is not a line)", got) |
| 24 | } |
| 25 | for i, want := range []string{"package main", "", "func main() {}"} { |
| 26 | if got := b.Line(i); got != want { |
| 27 | t.Errorf("Line(%d) = %q, want %q", i, got, want) |
| 28 | } |
| 29 | } |
| 30 | if b.Modified() { |
| 31 | t.Error("loading text must not mark the buffer modified") |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | func TestTextRoundTripsTheTrailingNewline(t *testing.T) { |
| 36 | tests := []struct { |
| 37 | name string |
| 38 | text string |
| 39 | }{ |
| 40 | {"with trailing newline", "a\nb\n"}, |
| 41 | {"without trailing newline", "a\nb"}, |
| 42 | {"empty", ""}, |
| 43 | {"only a newline", "\n"}, |
| 44 | } |
| 45 | |
| 46 | for _, tc := range tests { |
| 47 | t.Run(tc.name, func(t *testing.T) { |
| 48 | if got := NewFromString(tc.text).Text(); got != tc.text { |
| 49 | t.Errorf("Text() = %q, want %q", got, tc.text) |
| 50 | } |
| 51 | }) |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | func TestTextPreservesWindowsLineEndings(t *testing.T) { |
| 56 | b := NewFromString("a\r\nb\r\n") |
| 57 | |
| 58 | if got := b.LineCount(); got != 2 { |
| 59 | t.Fatalf("LineCount() = %d, want 2", got) |
| 60 | } |
| 61 | if got := b.Line(0); got != "a" { |
| 62 | t.Errorf("Line(0) = %q, want %q — the carriage return must be stripped", got, "a") |
| 63 | } |
| 64 | if got := b.Text(); got != "a\r\nb\r\n" { |
| 65 | t.Errorf("Text() = %q, want the original CRLF endings back", got) |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | func TestLineAccessorsToleratateOutOfRangeIndexes(t *testing.T) { |
| 70 | b := NewFromString("only") |
| 71 | |
| 72 | for _, i := range []int{-1, 1, 99} { |
| 73 | if got := b.Line(i); got != "" { |
| 74 | t.Errorf("Line(%d) = %q, want empty", i, got) |
| 75 | } |
| 76 | if got := b.LineLen(i); got != 0 { |
| 77 | t.Errorf("LineLen(%d) = %d, want 0", i, got) |
| 78 | } |
| 79 | if got := b.LineRunes(i); got != nil { |
| 80 | t.Errorf("LineRunes(%d) = %v, want nil", i, got) |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | func TestLineRunesReturnsAnIndependentCopy(t *testing.T) { |
| 86 | b := NewFromString("abc") |
| 87 | |
| 88 | runes := b.LineRunes(0) |
| 89 | runes[0] = 'X' |
| 90 | |
| 91 | if got := b.Line(0); got != "abc" { |
| 92 | t.Errorf("Line(0) = %q after mutating the returned slice, want %q", got, "abc") |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | func TestSetTabWidthIgnoresNonPositiveValues(t *testing.T) { |
| 97 | b := New() |
| 98 | |
| 99 | b.SetTabWidth(4) |
| 100 | if got := b.TabWidth(); got != 4 { |
| 101 | t.Fatalf("TabWidth() = %d, want 4", got) |
| 102 | } |
| 103 | |
| 104 | b.SetTabWidth(0) |
| 105 | b.SetTabWidth(-2) |
| 106 | if got := b.TabWidth(); got != 4 { |
| 107 | t.Errorf("TabWidth() = %d, want the previous 4 to be kept", got) |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | func TestPositionOrdering(t *testing.T) { |
| 112 | first := Position{Line: 1, Col: 5} |
| 113 | sameLineLater := Position{Line: 1, Col: 6} |
| 114 | nextLine := Position{Line: 2, Col: 0} |
| 115 | |
| 116 | if !first.Before(sameLineLater) { |
| 117 | t.Error("a smaller column on the same line must come first") |
| 118 | } |
| 119 | if !first.Before(nextLine) { |
| 120 | t.Error("a smaller line must come first whatever the columns") |
| 121 | } |
| 122 | if first.Before(first) { |
| 123 | t.Error("a position must not come before itself") |
| 124 | } |
| 125 | if !sameLineLater.After(first) { |
| 126 | t.Error("After must be the mirror of Before") |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | func TestNewRangeOrdersItsBounds(t *testing.T) { |
| 131 | low := Position{Line: 0, Col: 1} |
| 132 | high := Position{Line: 3, Col: 2} |
| 133 | |
| 134 | if got := NewRange(high, low); got.Start != low || got.End != high { |
| 135 | t.Errorf("NewRange(high, low) = %+v, want the bounds swapped", got) |
| 136 | } |
| 137 | if got := NewRange(low, high); got.Start != low || got.End != high { |
| 138 | t.Errorf("NewRange(low, high) = %+v, want the bounds kept", got) |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | func TestRangeContainsExcludesItsEnd(t *testing.T) { |
| 143 | r := Range{Start: Position{Line: 1}, End: Position{Line: 1, Col: 3}} |
| 144 | |
| 145 | if !r.Contains(Position{Line: 1}) { |
| 146 | t.Error("the start of a range is inside it") |
| 147 | } |
| 148 | if r.Contains(Position{Line: 1, Col: 3}) { |
| 149 | t.Error("the end of a range is outside it") |
| 150 | } |
| 151 | if empty := (Range{}); empty.Contains(Position{}) { |
| 152 | t.Error("an empty range contains nothing, not even its own position") |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | func TestAnEmptyBufferHoldsAnEmptyString(t *testing.T) { |
| 157 | // Not "\n": a buffer holds what was put into it, and nothing was. |
| 158 | if got := New().Text(); got != "" { |
| 159 | t.Errorf("New().Text() = %q, want empty", got) |
| 160 | } |
| 161 | if got := NewFromString("").Text(); got != "" { |
| 162 | t.Errorf("NewFromString(\"\").Text() = %q, want empty", got) |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | func TestPressingEnterGivesAFileItsTrailingNewline(t *testing.T) { |
| 167 | b := New() |
| 168 | b.Insert("package main") |
| 169 | b.InsertNewlineAndIndent() |
| 170 | |
| 171 | if got := b.Text(); got != "package main\n" { |
| 172 | t.Errorf("Text() = %q, want %q", got, "package main\n") |
| 173 | } |
| 174 | } |