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Convert `index.rst` and `license.rst` to markdown (#2852)
[etc/vim.git] / tests / test_trans.py
1 from typing import List, Tuple
2 from black.trans import iter_fexpr_spans
3
4
5 def test_fexpr_spans() -> None:
6     def check(
7         string: str, expected_spans: List[Tuple[int, int]], expected_slices: List[str]
8     ) -> None:
9         spans = list(iter_fexpr_spans(string))
10
11         # Checking slices isn't strictly necessary, but it's easier to verify at
12         # a glance than only spans
13         assert len(spans) == len(expected_slices)
14         for (i, j), slice in zip(spans, expected_slices):
15             assert len(string[i:j]) == j - i
16             assert string[i:j] == slice
17
18         assert spans == expected_spans
19
20     # Most of these test cases omit the leading 'f' and leading / closing quotes
21     # for convenience
22     # Some additional property-based tests can be found in
23     # https://github.com/psf/black/pull/2654#issuecomment-981411748
24     check("""{var}""", [(0, 5)], ["{var}"])
25     check("""f'{var}'""", [(2, 7)], ["{var}"])
26     check("""f'{1 + f() + 2 + "asdf"}'""", [(2, 24)], ["""{1 + f() + 2 + "asdf"}"""])
27     check("""text {var} text""", [(5, 10)], ["{var}"])
28     check("""text {{ {var} }} text""", [(8, 13)], ["{var}"])
29     check("""{a} {b} {c}""", [(0, 3), (4, 7), (8, 11)], ["{a}", "{b}", "{c}"])
30     check("""f'{a} {b} {c}'""", [(2, 5), (6, 9), (10, 13)], ["{a}", "{b}", "{c}"])
31     check("""{ {} }""", [(0, 6)], ["{ {} }"])
32     check("""{ {{}} }""", [(0, 8)], ["{ {{}} }"])
33     check("""{ {{{}}} }""", [(0, 10)], ["{ {{{}}} }"])
34     check("""{{ {{{}}} }}""", [(5, 7)], ["{}"])
35     check("""{{ {{{var}}} }}""", [(5, 10)], ["{var}"])
36     check("""{f"{0}"}""", [(0, 8)], ["""{f"{0}"}"""])
37     check("""{"'"}""", [(0, 5)], ["""{"'"}"""])
38     check("""{"{"}""", [(0, 5)], ["""{"{"}"""])
39     check("""{"}"}""", [(0, 5)], ["""{"}"}"""])
40     check("""{"{{"}""", [(0, 6)], ["""{"{{"}"""])
41     check("""{''' '''}""", [(0, 9)], ["""{''' '''}"""])
42     check("""{'''{'''}""", [(0, 9)], ["""{'''{'''}"""])
43     check("""{''' {'{ '''}""", [(0, 13)], ["""{''' {'{ '''}"""])
44     check(
45         '''f\'\'\'-{f"""*{f"+{f'.{x}.'}+"}*"""}-'y\\'\'\'\'''',
46         [(5, 33)],
47         ['''{f"""*{f"+{f'.{x}.'}+"}*"""}'''],
48     )
49     check(r"""{}{""", [(0, 2)], ["{}"])
50     check("""f"{'{'''''''''}\"""", [(2, 15)], ["{'{'''''''''}"])