xarray - add nodata tests

tests/test_io_xarray.py

@@ -129,6 +129,8 @@ def test_xarray_reader_external_nodata():
     data.attrs.update({"valid_min": arr.min(), "valid_max": arr.max()})
 
     data.rio.write_crs("epsg:4326", inplace=True)
+    assert data.rio.nodata is None
+
     with XarrayReader(data) as dst:
         info = dst.info()
         assert info.height == 180
@@ -141,18 +143,21 @@ def test_xarray_reader_external_nodata():
         assert img.mask.all()
         assert img.data[0, 0, 0] == 0
         assert img.data[0, 100, 100]
+        assert dst.input.rio.nodata is None
 
         # overwrite the nodata value to 0
         img = dst.tile(0, 0, 1, nodata=0)
         assert not img.mask.all()  # not all the mask value are set to 255
         assert img.array.mask[0, 0, 0]  # the top left pixel should be masked
         assert not img.array.mask[0, 100, 100]  # pixel 100,100 shouldn't be masked
+        assert dst.input.rio.nodata is None
 
         # PART
         img = dst.part((-160, -80, 160, 80))
         assert img.mask.all()
         assert img.data[0, 0, 0] == 0
         assert img.data[0, 100, 100]
+        assert dst.input.rio.nodata is None
 
         # overwrite the nodata value to 0
         img = dst.part((-160, -80, 160, 80), nodata=0)
@@ -163,11 +168,13 @@ def test_xarray_reader_external_nodata():
         # POINT
         pt = dst.point(-179, 89)
         assert pt.mask[0] == 255
+        assert dst.input.rio.nodata is None
 
         # overwrite the nodata value to 0
         pt = dst.point(-179, 89, nodata=0)
         assert pt.count == 1
         assert pt.mask[0] == 0
+        assert dst.input.rio.nodata is None
 
         feat = {
             "type": "Feature",
@@ -191,12 +198,14 @@ def test_xarray_reader_external_nodata():
         assert img.mask.all()
         assert img.data[0, 0, 0] == 0
         assert img.data[0, 50, 100]
+        assert dst.input.rio.nodata is None
 
         # overwrite the nodata value to 0
         img = dst.feature(feat, nodata=0)
         assert not img.mask.all()  # not all the mask value are set to 255
         assert img.array.mask[0, 0, 0]  # the top left pixel should be masked
         assert not img.array.mask[0, 50, 100]  # pixel 50,100 shouldn't be masked
+        assert dst.input.rio.nodata is None
 
 
 def test_xarray_reader_internal_nodata():
@@ -219,6 +228,7 @@ def test_xarray_reader_internal_nodata():
     )
 
     data.rio.write_crs("epsg:4326", inplace=True)
+    assert data.rio.nodata is not None
 
     with XarrayReader(data) as dst:
         # TILE