def test_parse_stream_empty():
"""An empty file treats like empty array"""
assert len(parse_stream(StringIO("")).changes) == 0
def test_parse_stream_json_empty_array():
assert len(parse_stream(StringIO("[]")).changes) == 0
def test_parse_stream_yaml_empty_array():
assert len(parse_stream(StringIO("---\n")).changes) == 0
def test_parse_stream_not_valid_json_or_yaml():
with pytest.raises(Exception, match=r'^not valid JSON or YAML$'):
parse_stream(StringIO(NOT_VALID_YAML_OR_JSON))