Tests

Adds `zoom_adjust` to `add_basemap` #178

Job	Run time
macos, ci/envs/38-minimal.yaml	2m 54s
macos, ci/envs/311-latest-conda-forge.yaml	3m 12s
ubuntu, ci/envs/38-minimal.yaml	1m 40s
ubuntu, ci/envs/311-latest-conda-forge.yaml	1m 51s
windows, ci/envs/38-minimal.yaml	7m 20s
windows, ci/envs/311-latest-conda-forge.yaml	7m 20s
ubuntu, ci/envs/310-conda-forge.yaml	1m 30s
ubuntu, ci/envs/39-conda-forge.yaml	1m 30s
	27m 17s

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