TST: Add CRS mismatch warning to cython branch (geopandas#584)

Author: jdmcbr

geopandas/tools/sjoin.py

@@ -1,4 +1,5 @@
 from __future__ import absolute_import, division, print_function
+from warnings import warn
 
 from warnings import warn
 

geopandas/tools/tests/test_sjoin.py

@@ -18,7 +18,6 @@
     Polygon([(random.random(), random.random()) for i in range(3)]) for _ in range(10)
 ]
 
-
 points = [Point(random.random(), random.random()) for _ in range(20)]
 
 
@@ -93,6 +92,28 @@ def test_sjoin(op, lsuffix, rsuffix, how, missing):
                 assert any(p.equals(p2) for p2 in L)
 
 
+def test_crs_mismatch():
+    left = gpd.GeoDataFrame(
+        {
+            "geometry": triangles,
+            "x": np.random.random(len(triangles)),
+            "y": np.random.random(len(triangles)),
+        },
+        crs={"init": "epsg:4326"},
+    )
+
+    right = gpd.GeoDataFrame(
+        {
+            "geometry": points,
+            "x": np.random.random(len(points)),
+            "z": np.random.random(len(points)),
+        }
+    )
+
+    with pytest.warns(UserWarning):
+        sjoin(left, right)
+
+
 def test_errors():
     left = GeoDataFrame(
         {