TST: Add more tests for rasterio engine

[snowman2]

Continuation of #281

In the process of doing this:

1. I noticed xarray.open_rasterio was being tested instead of rioxarray.open_rasterio, so I updated that.
2. Added fix for missing arguments in the engine.

[codecov]

Codecov Report

Merging #293 (e5e10cf) into master (497c718) will increase coverage by 1.30%.
The diff coverage is 0.00%.

❗ Current head e5e10cf differs from pull request most recent head 06baf6f. Consider uploading reports for the commit 06baf6f to get more accurate results

@@ Coverage Diff @@## master #293 +/- ##
==========================================
+ Coverage 92.61% 93.91% +1.30% 
==========================================
Files 13 13 Lines 1395 1398 +3 ==========================================
+ Hits 1292 1313 +21 + Misses 103 85 -18 

Impacted Files	Coverage Δ
rioxarray/xarray_plugin.py	0.00% <0.00%> (ø)
rioxarray/raster_array.py	97.61% <0.00%> (-0.69%)	⬇️
rioxarray/_io.py	92.52% <0.00%> (+6.37%)	⬆️

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