tests/test_format.py

   1 from dataclasses import replace
   2 from typing import Any, Iterator
   3 from unittest.mock import patch
   4
   5 import pytest
   6
   7 import black
   8 from tests.util import (
   9     DEFAULT_MODE,
  10     PY36_VERSIONS,
  11     assert_format,
  12     dump_to_stderr,
  13     read_data,
  14     all_data_cases,
  15 )
  16
  17
  18 @pytest.fixture(autouse=True)
  19 def patch_dump_to_file(request: Any) -> Iterator[None]:
  20     with patch("black.dump_to_file", dump_to_stderr):
  21         yield
  22
  23
  24 def check_file(
  25     subdir: str, filename: str, mode: black.Mode, *, data: bool = True
  26 ) -> None:
  27     source, expected = read_data(subdir, filename, data=data)
  28     assert_format(source, expected, mode, fast=False)
  29
  30
  31 @pytest.mark.parametrize("filename", all_data_cases("simple_cases"))
  32 def test_simple_format(filename: str) -> None:
  33     check_file("simple_cases", filename, DEFAULT_MODE)
  34
  35
  36 @pytest.mark.parametrize("filename", all_data_cases("preview"))
  37 def test_preview_format(filename: str) -> None:
  38     check_file("preview", filename, black.Mode(preview=True))
  39
  40
  41 @pytest.mark.parametrize("filename", all_data_cases("preview_39"))
  42 def test_preview_minimum_python_39_format(filename: str) -> None:
  43     source, expected = read_data("preview_39", filename)
  44     mode = black.Mode(preview=True)
  45     assert_format(source, expected, mode, minimum_version=(3, 9))
  46
  47
  48 @pytest.mark.parametrize("filename", all_data_cases("preview_310"))
  49 def test_preview_minimum_python_310_format(filename: str) -> None:
  50     source, expected = read_data("preview_310", filename)
  51     mode = black.Mode(preview=True)
  52     assert_format(source, expected, mode, minimum_version=(3, 10))
  53
  54
  55 # =============== #
  56 # Complex cases
  57 # ============= #
  58
  59
  60 def test_empty() -> None:
  61     source = expected = ""
  62     assert_format(source, expected)
  63
  64
  65 @pytest.mark.parametrize("filename", all_data_cases("py_36"))
  66 def test_python_36(filename: str) -> None:
  67     source, expected = read_data("py_36", filename)
  68     mode = black.Mode(target_versions=PY36_VERSIONS)
  69     assert_format(source, expected, mode, minimum_version=(3, 6))
  70
  71
  72 @pytest.mark.parametrize("filename", all_data_cases("py_37"))
  73 def test_python_37(filename: str) -> None:
  74     source, expected = read_data("py_37", filename)
  75     mode = black.Mode(target_versions={black.TargetVersion.PY37})
  76     assert_format(source, expected, mode, minimum_version=(3, 7))
  77
  78
  79 @pytest.mark.parametrize("filename", all_data_cases("py_38"))
  80 def test_python_38(filename: str) -> None:
  81     source, expected = read_data("py_38", filename)
  82     mode = black.Mode(target_versions={black.TargetVersion.PY38})
  83     assert_format(source, expected, mode, minimum_version=(3, 8))
  84
  85
  86 @pytest.mark.parametrize("filename", all_data_cases("py_39"))
  87 def test_python_39(filename: str) -> None:
  88     source, expected = read_data("py_39", filename)
  89     mode = black.Mode(target_versions={black.TargetVersion.PY39})
  90     assert_format(source, expected, mode, minimum_version=(3, 9))
  91
  92
  93 @pytest.mark.parametrize("filename", all_data_cases("py_310"))
  94 def test_python_310(filename: str) -> None:
  95     source, expected = read_data("py_310", filename)
  96     mode = black.Mode(target_versions={black.TargetVersion.PY310})
  97     assert_format(source, expected, mode, minimum_version=(3, 10))
  98
  99
 100 @pytest.mark.parametrize("filename", all_data_cases("py_310"))
 101 def test_python_310_without_target_version(filename: str) -> None:
 102     source, expected = read_data("py_310", filename)
 103     mode = black.Mode()
 104     assert_format(source, expected, mode, minimum_version=(3, 10))
 105
 106
 107 def test_patma_invalid() -> None:
 108     source, expected = read_data("miscellaneous", "pattern_matching_invalid")
 109     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 110     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 111         assert_format(source, expected, mode, minimum_version=(3, 10))
 112
 113     exc_info.match("Cannot parse: 10:11")
 114
 115
 116 @pytest.mark.parametrize("filename", all_data_cases("py_311"))
 117 def test_python_311(filename: str) -> None:
 118     source, expected = read_data("py_311", filename)
 119     mode = black.Mode(target_versions={black.TargetVersion.PY311})
 120     assert_format(source, expected, mode, minimum_version=(3, 11))
 121
 122
 123 @pytest.mark.parametrize("filename", all_data_cases("fast"))
 124 def test_fast_cases(filename: str) -> None:
 125     source, expected = read_data("fast", filename)
 126     assert_format(source, expected, fast=True)
 127
 128
 129 def test_python_2_hint() -> None:
 130     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 131         assert_format("print 'daylily'", "print 'daylily'")
 132     exc_info.match(black.parsing.PY2_HINT)
 133
 134
 135 def test_docstring_no_string_normalization() -> None:
 136     """Like test_docstring but with string normalization off."""
 137     source, expected = read_data("miscellaneous", "docstring_no_string_normalization")
 138     mode = replace(DEFAULT_MODE, string_normalization=False)
 139     assert_format(source, expected, mode)
 140
 141
 142 def test_long_strings_flag_disabled() -> None:
 143     """Tests for turning off the string processing logic."""
 144     source, expected = read_data("miscellaneous", "long_strings_flag_disabled")
 145     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 146     assert_format(source, expected, mode)
 147
 148
 149 def test_stub() -> None:
 150     mode = replace(DEFAULT_MODE, is_pyi=True)
 151     source, expected = read_data("miscellaneous", "stub.pyi")
 152     assert_format(source, expected, mode)
 153
 154
 155 def test_power_op_newline() -> None:
 156     # requires line_length=0
 157     source, expected = read_data("miscellaneous", "power_op_newline")
 158     assert_format(source, expected, mode=black.Mode(line_length=0))