diff --git a/draw/braille_line_test.go b/draw/braille_line_test.go
index 552bc8e..c632c10 100644
--- a/draw/braille_line_test.go
+++ b/draw/braille_line_test.go
@@ -245,6 +245,70 @@ func TestBrailleLine(t *testing.T) {
 				testbraille.MustSetPixel(bc, image.Point{1, 2})
 				testbraille.MustSetPixel(bc, image.Point{0, 3})
 
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:   "draws horizontal line, octant E",
+			canvas: image.Rect(0, 0, 1, 1),
+			start:  image.Point{0, 0},
+			end:    image.Point{1, 0},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testbraille.MustSetPixel(bc, image.Point{0, 0})
+				testbraille.MustSetPixel(bc, image.Point{1, 0})
+
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:   "draws horizontal line, octant W",
+			canvas: image.Rect(0, 0, 1, 1),
+			start:  image.Point{1, 0},
+			end:    image.Point{0, 0},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testbraille.MustSetPixel(bc, image.Point{0, 0})
+				testbraille.MustSetPixel(bc, image.Point{1, 0})
+
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:   "draws vertical line, octant S",
+			canvas: image.Rect(0, 0, 1, 1),
+			start:  image.Point{0, 0},
+			end:    image.Point{0, 1},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testbraille.MustSetPixel(bc, image.Point{0, 0})
+				testbraille.MustSetPixel(bc, image.Point{0, 1})
+
+				testbraille.MustApply(bc, ft)
+				return ft
+			},
+		},
+		{
+			desc:   "draws vertical line, octant N",
+			canvas: image.Rect(0, 0, 1, 1),
+			start:  image.Point{0, 1},
+			end:    image.Point{0, 0},
+			want: func(size image.Point) *faketerm.Terminal {
+				ft := faketerm.MustNew(size)
+				bc := testbraille.MustNew(ft.Area())
+
+				testbraille.MustSetPixel(bc, image.Point{0, 0})
+				testbraille.MustSetPixel(bc, image.Point{0, 1})
+
 				testbraille.MustApply(bc, ft)
 				return ft
 			},