1 files changed, 37 insertions, 0 deletions
diff --git a/city/geometry-test.lua b/city/geometry-test.lua
index 758ce95..d48abbc 100644
--- a/city/geometry-test.lua
+++ b/city/geometry-test.lua
@@ -132,6 +132,43 @@ test(
    end
 )
 
+test(
+   'intersect various squares',
+   function()
+      local center = geom.point(0, 0)
+      local square = geom.square(center, 2)
+
+      -- overlap x/y
+      assert(square:intersects(
+		geom.square(geom.point(1, 1), 2)))
+
+      -- nest inside
+      assert(square:intersects(
+		geom.square(geom.point(0, 0), 1)))
+
+      -- nest outside
+      assert(square:intersects(
+		geom.square(geom.point(0, 0), 5)))
+
+      -------- non-intersections --------
+
+      -- share x on left
+      assert(not square:intersects(
+		geom.square(geom.point(-2, 0), 2)))
+
+      -- share x on right
+      assert(not square:intersects(
+		geom.square(geom.point(2, 0), 2)))
+
+      -- share y on top
+      assert(not square:intersects(
+		geom.square(geom.point(0, -2), 2)))
+
+      -- share y on bottom
+      assert(not square:intersects(
+		geom.square(geom.point(0, 2), 2)))
+   end
+)
 
 -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 --