Suggestion: change RANDOM → ARBITRARY

[schwehr]

In tests/utils/test_cases.py, the values are arbitrary fixed values. People might take RANDOM to mean different every run. Noticed during review of #201

RANDOM_GEOM = {
    "type":
    "Polygon",
    "coordinates": [[[-2.5048828125, 3.8916575492899987], [-1.9610595703125, 3.8916575492899987],
                     [-1.9610595703125, 4.275202171119132], [-2.5048828125, 4.275202171119132],
                     [-2.5048828125, 3.8916575492899987]]]
}

RANDOM_BBOX = [
    RANDOM_GEOM['coordinates'][0][0][0], RANDOM_GEOM['coordinates'][0][0][1],
    RANDOM_GEOM['coordinates'][0][1][0], RANDOM_GEOM['coordinates'][0][1][1]
]

RANDOM_EXTENT = Extent(spatial=SpatialExtent.from_coordinates(RANDOM_GEOM['coordinates']),
                       temporal=TemporalExtent.from_now())  # noqa: E126

[lossyrob]

Will be fixed in #309