From 81c03d3da1ed3fb822cbafd30a553c03b8ae06bd Mon Sep 17 00:00:00 2001
From: mikhailofff <asdgrghd@gmail.com>
Date: Tue, 27 Jan 2026 17:02:22 +0400
Subject: [PATCH 1/2] add tests for string clip edge cases

---
 iOverlay/src/string/clip.rs | 104 +++++++++++++++++++++++++++++++++++-
 1 file changed, 103 insertions(+), 1 deletion(-)

diff --git a/iOverlay/src/string/clip.rs b/iOverlay/src/string/clip.rs
index 9b6e848..2e79c07 100644
--- a/iOverlay/src/string/clip.rs
+++ b/iOverlay/src/string/clip.rs
@@ -243,7 +243,6 @@ impl IntClip for [IntPoint] {
     }
 }
 
-
 #[cfg(test)]
 mod tests {
     use alloc::vec;
@@ -354,4 +353,107 @@ mod tests {
         assert_eq!(result_0.len(), 3);
         assert_eq!(result_1.len(), 2);
     }
+
+    #[test]
+    fn test_tiny_shape() {
+        let path = vec![
+            IntPoint::new(-1, 0),
+            IntPoint::new(1, 0),
+            IntPoint::new(0, 1),
+        ];
+
+        let result_0 = path.clip_line(
+            [IntPoint::new(0, -1), IntPoint::new(0, 2)],
+            FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: false },
+        );
+
+        let result_1 = path.clip_line(
+            [IntPoint::new(0, -1), IntPoint::new(0, 2)],
+            FillRule::NonZero,
+            ClipRule { invert: true, boundary_included: false },
+        );
+
+        assert_eq!(result_0.len(), 1);
+        assert_eq!(result_1.len(), 2);
+    }
+
+    #[test]
+    fn test_shared_vertices_0() {
+        let path = vec![
+            IntPoint::new(-1, -1),
+            IntPoint::new(1, -1),
+            IntPoint::new(1, 1),
+            IntPoint::new(-1, 1),
+        ];
+
+        let result_0 = path.clip_line(
+            [IntPoint::new(-1, -1), IntPoint::new(1, -1)],
+            FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: false },
+        );
+
+        let result_1 = path.clip_line(
+            [IntPoint::new(-1, -1), IntPoint::new(1, -1)],
+            FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: true },
+        );
+
+        assert_eq!(result_0.len(), 0);
+        assert_eq!(result_1.len(), 1);
+    }
+
+    #[test]
+    fn test_shared_vertices_1() {
+        let rect = vec![
+            IntPoint::new(-2, -2),
+            IntPoint::new(2, -2),
+            IntPoint::new(3, 0),
+            IntPoint::new(-3, 0),
+        ];
+
+        let path = vec![
+            IntPoint::new(-4, 1),
+            IntPoint::new(-2, -2),
+            IntPoint::new(2, -2),
+            IntPoint::new(4, 1),
+        ];
+
+        let result_0 = rect.clip_path(&path, FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: false },
+        );
+
+        let result_1 = rect.clip_path(&path, FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: true },
+        );
+
+        assert_eq!(result_0.len(), 0);
+        assert_eq!(result_1.len(), 1);
+    }
+
+    #[test]
+    fn test_sliding_intersection() {
+        let path = vec![
+            IntPoint::new(0, 0),
+            IntPoint::new(2, 0),
+            IntPoint::new(2, 2),
+            IntPoint::new(1, 0),
+            IntPoint::new(0, 2),
+        ];
+
+        let result_0 = path.clip_line(
+            [IntPoint::new(-3, 2), IntPoint::new(3, 2)],
+            FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: false },
+        );
+
+        let result_1 = path.clip_line(
+            [IntPoint::new(-3, 2), IntPoint::new(3, 2)],
+            FillRule::NonZero,
+            ClipRule { invert: false, boundary_included: false },
+        );
+
+        assert_eq!(result_0.len(), 0);
+        assert_eq!(result_1.len(), 0);
+    }
 }

From 73269da38913f1c2c0455bcc170197ab54688d16 Mon Sep 17 00:00:00 2001
From: mikhailofff <asdgrghd@gmail.com>
Date: Tue, 27 Jan 2026 21:53:16 +0400
Subject: [PATCH 2/2] refactor for correct variable name

---
 iOverlay/src/string/clip.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/iOverlay/src/string/clip.rs b/iOverlay/src/string/clip.rs
index 2e79c07..3d9d935 100644
--- a/iOverlay/src/string/clip.rs
+++ b/iOverlay/src/string/clip.rs
@@ -405,7 +405,7 @@ mod tests {
 
     #[test]
     fn test_shared_vertices_1() {
-        let rect = vec![
+        let contour = vec![
             IntPoint::new(-2, -2),
             IntPoint::new(2, -2),
             IntPoint::new(3, 0),
@@ -419,11 +419,11 @@ mod tests {
             IntPoint::new(4, 1),
         ];
 
-        let result_0 = rect.clip_path(&path, FillRule::NonZero,
+        let result_0 = contour.clip_path(&path, FillRule::NonZero,
             ClipRule { invert: false, boundary_included: false },
         );
 
-        let result_1 = rect.clip_path(&path, FillRule::NonZero,
+        let result_1 = contour.clip_path(&path, FillRule::NonZero,
             ClipRule { invert: false, boundary_included: true },
         );