test: Add a test for 0-radius negative arcs

This test checks the behavior of
e46dc9e17a6f6737d5624dbcdd3c42c2353a72f1

1 files changed, 14 insertions, 0 deletions

diff --git a/test/get-path-extents.c b/test/get-path-extents.c
index 5bd3eb70a..bd54f0ef9 100644
--- a/test/get-path-extents.c
+++ b/test/get-path-extents.c
@@ -151,12 +151,26 @@ draw (cairo_t *cr, int width, int height)
     errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
 
     cairo_new_path (cr2);
+    cairo_arc_negative (cr2, 200, 400, 0., 0, 2 * M_PI);
+    phase = "Degenerate negative arc (R=0)";
+    errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 200, 400, 0, 0);
+
+    cairo_new_path (cr2);
+    cairo_new_path (cr2);
     cairo_arc (cr2, 200, 400, 10., 0, 0);
     phase = "Degenerate arc (Θ=0)";
     errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
     errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
     errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 210, 400, 0, 0);
 
+    cairo_arc_negative (cr2, 200, 400, 10., 0, 0);
+    phase = "Degenerate negative arc (Θ=0)";
+    errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 210, 400, 0, 0);
+
     cairo_new_path (cr2);
     cairo_restore (cr2);