test_download_model doesn't test anything?

[pmeier]

The test simply calls load_pretrained twice, but doesn't do anything with the results:

unlockNN/tests/test_download.py

Lines 11 to 17 in 128b192

	def test_load_model(tmp_path: Path):
	"""Test downloading formation energies model."""
	orig_model = load_pretrained("binary_e_form", save_dir=tmp_path)
	reload_model = load_pretrained("binary_e_form", save_dir=tmp_path)
	def test_load_data(tmp_path: Path):

[a-ws-m]

I've used pytest-mock to implement an actual test here now. Originally, I was just checking the commands executed without raising any errors, but it makes sense to more rigorously check that the first function call downloads the data and the second one reloads it from disk.