[librsvg: 4/9] Add test for zero-length subpaths

[Federico Mena Quintero <federico src gnome org>]

commit 6aceaec3bd773f32223107d2d4fdd04aca7eeae1
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri May 28 15:58:28 2021 -0500

    Add test for zero-length subpaths

 src/path_builder.rs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/src/path_builder.rs b/src/path_builder.rs
index 71dba452..62d49dcf 100644
--- a/src/path_builder.rs
+++ b/src/path_builder.rs
@@ -857,4 +857,30 @@ mod tests {
             ]
         );
     }
+
+    #[test]
+    fn zero_length_subpaths() {
+        let mut builder = PathBuilder::default();
+        builder.move_to(42.0, 43.0);
+        builder.move_to(44.0, 45.0);
+        builder.close_path();
+        builder.move_to(46.0, 47.0);
+        builder.line_to(48.0, 49.0);
+
+        let path = builder.into_path();
+
+        let subpaths = path
+            .iter_subpath()
+            .map(|subpath| (subpath.is_zero_length(), subpath.origin()))
+            .collect::<Vec<(bool, (f64, f64))>>();
+
+        assert_eq!(
+            subpaths,
+            vec![
+                (true, (42.0, 43.0)),
+                (true, (44.0, 45.0)),
+                (false, (46.0, 47.0)),
+            ]
+        );
+    }
 }