Fix autoscale bug, add test coverage (#101)

* Fix autoscale bug, add test coverage

* lint

tests/test_router.py

@@ -92,6 +92,14 @@ def test_get_map(xpublish_client):
     assert response.status_code == 200, "Response did not return successfully"
     assert response.headers["content-type"] == "image/png", "Response is not an image"
 
+    autoscale_response = xpublish_client.get(
+        "datasets/air/wms?version=1.3.0&service=WMS&request=GetMap&layers=air&styles=raster/default&crs=EPSG:4326&bbox=-160.0,15.0,-30.0,75.0&width=512&height=513&format=image/png&colorscalerange=227.0,302.6&autoscale=True",
+    )
+    assert autoscale_response.status_code == 200, "Response did not return successfully"
+    assert (
+        autoscale_response.headers["content-type"] == "image/png"
+    ), "Response is not an image"
+
 
 def test_get_feature_info(xpublish_client):
     response = xpublish_client.get(

xpublish_wms/wms/get_map.py

@@ -332,9 +332,9 @@ def render(
                 return {"min": float(da.min()), "max": float(da.max())}
 
         if not self.autoscale:
-            vmin, vmax = self.colorscalerange
+            span = (self.colorscalerange[0], self.colorscalerange[1])
         else:
-            vmin, vmax = [None, None]
+            span = None
 
         start_shade = time.time()
         cvs = dsh.Canvas(
@@ -344,8 +344,6 @@ def render(
             y_range=(self.bbox[1], self.bbox[3]),
         )
 
-        print(da)
-
         if ds.gridded.render_method == RenderMethod.Quad:
             mesh = cvs.quadmesh(
                 da,
@@ -373,7 +371,7 @@ def render(
             mesh,
             cmap=cm.get_cmap(self.palettename),
             how="linear",
-            span=(vmin, vmax),
+            span=span,
         )
         logger.info(f"WMS GetMap Shade time: {time.time() - start_shade}")