Fixed bugs and added tests for FlutterMapNetworkImageProvider
#1662
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Testing it fails and fallback appropriately under different http responses.
Currently the last test, "test load with invalid response (with successful fallback)" fails. The primary URL returns 200 OK but HTML not a image. The fallback URL is never attempted. Per the discussion on discord this may be a bug, however, it looks to fix this you need to go higher up the stack (I suspect TileImage) because the image isn't actually processed until then.