test(wms): add test case for #416

tests/unit/test_wms.py

@@ -1,5 +1,6 @@
 from PIL.PngImagePlugin import PngImageFile
 
+from sketch_map_tool.models import Bbox, Layer, Size
 from sketch_map_tool.wms import client
 from tests import vcr_app as vcr
 
@@ -16,3 +17,22 @@ def test_as_image(bbox, size, layer):
     image = client.as_image(response)
     # image.show()  # for showing of the image during manual testing
     assert isinstance(image, PngImageFile)
+
+
+# @vcr.use_cassette
+def test_as_image_could_not_get_any_sources(bbox, size, layer):
+    """Test case covering issue described in #416"""
+    bbox = Bbox(
+        *[
+            3115430.61527546,
+            859273.1634149066,
+            3116705.00304079,
+            860339.8395431428,
+        ]
+    )
+    size = Size(**{"width": 1716, "height": 1436})
+    layer = Layer("esri-world-imagery")
+    response = client.get_map_image(bbox, size, layer)
+    image = client.as_image(response)
+    image.show()  # for showing of the image during manual testing
+    assert isinstance(image, PngImageFile)