def test_keys(setup_teardown_file):
""".keys provides a key view."""
f = setup_teardown_file[3]
grp = f.create_group("test")
grp.create_group("a")
grp.create_group("b")
grp.create_group("c")
grp.create_group("d")
assert isinstance(grp.keys(), KeysView)
assert sorted(list(grp.keys())) == ["a", "b", "c", "d"]
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