From e1e0f2b17519c5b65be7ca0855fcff2179e5b997 Mon Sep 17 00:00:00 2001
From: Phil Ellison <phil.j.ellison@gmail.com>
Date: Sun, 19 May 2024 19:32:29 +0100
Subject: [PATCH] Add test for drawing line segment with zero length and remove
 dead code from intersection_points

---
 src/drawing/line.rs | 15 +++++++++++++++
 src/hough.rs        |  3 ---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/drawing/line.rs b/src/drawing/line.rs
index d4fdc8a2..2d38b1d6 100644
--- a/src/drawing/line.rs
+++ b/src/drawing/line.rs
@@ -353,6 +353,21 @@ mod tests {
     //   3 / | \ 0
     //   / 2 | 1 \
 
+    #[test]
+    fn test_draw_line_segment_zero_length() {
+        let image = GrayImage::from_pixel(5, 5, Luma([1u8]));
+
+        let expected = gray_image!(
+            1, 1, 1, 1, 1;
+            4, 1, 1, 1, 1;
+            1, 1, 1, 1, 1;
+            1, 1, 1, 1, 1;
+            1, 1, 1, 1, 1);
+
+        let actual = draw_line_segment(&image, (0f32, 1f32), (0f32, 1f32), Luma([4u8]));
+        assert_pixels_eq!(actual, expected);
+    }
+
     #[test]
     fn test_draw_line_segment_horizontal() {
         let image = GrayImage::from_pixel(5, 5, Luma([1u8]));
diff --git a/src/hough.rs b/src/hough.rs
index 87746aca..b6af7f8e 100644
--- a/src/hough.rs
+++ b/src/hough.rs
@@ -170,9 +170,6 @@ pub fn intersection_points(
 
     if right_y >= 0.0 && right_y <= h {
         let right_intersect = (w, right_y);
-        if let Some(s) = start {
-            return Some((s, right_intersect));
-        }
         start = Some(right_intersect);
     }