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This test sets up a basic MuJoCo rendering context similar to the example in
https://mujoco.readthedocs.io/en/latest/programming#visualization
It calls `mjr_rectangle` rather than `mjr_render` so that we can assert an
exact rendered image without needing golden data. The purpose of this test
is to ensure that the bindings can correctly return pixels in Python, rather
than to test MuJoCo's rendering pipeline itself.
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