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     all_data_cases,
  12     assert_format,
  13     dump_to_stderr,
  14     read_data,
  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.filterwarnings("ignore:invalid escape sequence.*:DeprecationWarning")
  32 @pytest.mark.parametrize("filename", all_data_cases("simple_cases"))
  33 def test_simple_format(filename: str) -> None:
  34     check_file("simple_cases", filename, DEFAULT_MODE)
  35
  36
  37 @pytest.mark.parametrize("filename", all_data_cases("preview"))
  38 def test_preview_format(filename: str) -> None:
  39     magic_trailing_comma = filename != "skip_magic_trailing_comma"
  40     check_file(
  41         "preview",
  42         filename,
  43         black.Mode(preview=True, magic_trailing_comma=magic_trailing_comma),
  44     )
  45
  46
  47 @pytest.mark.parametrize("filename", all_data_cases("preview_39"))
  48 def test_preview_minimum_python_39_format(filename: str) -> None:
  49     source, expected = read_data("preview_39", filename)
  50     mode = black.Mode(preview=True)
  51     assert_format(source, expected, mode, minimum_version=(3, 9))
  52
  53
  54 @pytest.mark.parametrize("filename", all_data_cases("preview_310"))
  55 def test_preview_minimum_python_310_format(filename: str) -> None:
  56     source, expected = read_data("preview_310", filename)
  57     mode = black.Mode(preview=True)
  58     assert_format(source, expected, mode, minimum_version=(3, 10))
  59
  60
  61 # =============== #
  62 # Complex cases
  63 # ============= #
  64
  65
  66 def test_empty() -> None:
  67     source = expected = ""
  68     assert_format(source, expected)
  69
  70
  71 @pytest.mark.parametrize("filename", all_data_cases("py_36"))
  72 def test_python_36(filename: str) -> None:
  73     source, expected = read_data("py_36", filename)
  74     mode = black.Mode(target_versions=PY36_VERSIONS)
  75     assert_format(source, expected, mode, minimum_version=(3, 6))
  76
  77
  78 @pytest.mark.parametrize("filename", all_data_cases("py_37"))
  79 def test_python_37(filename: str) -> None:
  80     source, expected = read_data("py_37", filename)
  81     mode = black.Mode(target_versions={black.TargetVersion.PY37})
  82     assert_format(source, expected, mode, minimum_version=(3, 7))
  83
  84
  85 @pytest.mark.parametrize("filename", all_data_cases("py_38"))
  86 def test_python_38(filename: str) -> None:
  87     source, expected = read_data("py_38", filename)
  88     mode = black.Mode(target_versions={black.TargetVersion.PY38})
  89     assert_format(source, expected, mode, minimum_version=(3, 8))
  90
  91
  92 @pytest.mark.parametrize("filename", all_data_cases("py_39"))
  93 def test_python_39(filename: str) -> None:
  94     source, expected = read_data("py_39", filename)
  95     mode = black.Mode(target_versions={black.TargetVersion.PY39})
  96     assert_format(source, expected, mode, minimum_version=(3, 9))
  97
  98
  99 @pytest.mark.parametrize("filename", all_data_cases("py_310"))
 100 def test_python_310(filename: str) -> None:
 101     source, expected = read_data("py_310", filename)
 102     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 103     assert_format(source, expected, mode, minimum_version=(3, 10))
 104
 105
 106 @pytest.mark.parametrize("filename", all_data_cases("py_310"))
 107 def test_python_310_without_target_version(filename: str) -> None:
 108     source, expected = read_data("py_310", filename)
 109     mode = black.Mode()
 110     assert_format(source, expected, mode, minimum_version=(3, 10))
 111
 112
 113 def test_patma_invalid() -> None:
 114     source, expected = read_data("miscellaneous", "pattern_matching_invalid")
 115     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 116     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 117         assert_format(source, expected, mode, minimum_version=(3, 10))
 118
 119     exc_info.match("Cannot parse: 10:11")
 120
 121
 122 @pytest.mark.parametrize("filename", all_data_cases("py_311"))
 123 def test_python_311(filename: str) -> None:
 124     source, expected = read_data("py_311", filename)
 125     mode = black.Mode(target_versions={black.TargetVersion.PY311})
 126     assert_format(source, expected, mode, minimum_version=(3, 11))
 127
 128
 129 @pytest.mark.parametrize("filename", all_data_cases("fast"))
 130 def test_fast_cases(filename: str) -> None:
 131     source, expected = read_data("fast", filename)
 132     assert_format(source, expected, fast=True)
 133
 134
 135 def test_python_2_hint() -> None:
 136     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 137         assert_format("print 'daylily'", "print 'daylily'")
 138     exc_info.match(black.parsing.PY2_HINT)
 139
 140
 141 @pytest.mark.filterwarnings("ignore:invalid escape sequence.*:DeprecationWarning")
 142 def test_docstring_no_string_normalization() -> None:
 143     """Like test_docstring but with string normalization off."""
 144     source, expected = read_data("miscellaneous", "docstring_no_string_normalization")
 145     mode = replace(DEFAULT_MODE, string_normalization=False)
 146     assert_format(source, expected, mode)
 147
 148
 149 def test_docstring_line_length_6() -> None:
 150     """Like test_docstring but with line length set to 6."""
 151     source, expected = read_data("miscellaneous", "linelength6")
 152     mode = black.Mode(line_length=6)
 153     assert_format(source, expected, mode)
 154
 155
 156 def test_preview_docstring_no_string_normalization() -> None:
 157     """
 158     Like test_docstring but with string normalization off *and* the preview style
 159     enabled.
 160     """
 161     source, expected = read_data(
 162         "miscellaneous", "docstring_preview_no_string_normalization"
 163     )
 164     mode = replace(DEFAULT_MODE, string_normalization=False, preview=True)
 165     assert_format(source, expected, mode)
 166
 167
 168 def test_long_strings_flag_disabled() -> None:
 169     """Tests for turning off the string processing logic."""
 170     source, expected = read_data("miscellaneous", "long_strings_flag_disabled")
 171     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 172     assert_format(source, expected, mode)
 173
 174
 175 def test_stub() -> None:
 176     mode = replace(DEFAULT_MODE, is_pyi=True)
 177     source, expected = read_data("miscellaneous", "stub.pyi")
 178     assert_format(source, expected, mode)
 179
 180
 181 def test_power_op_newline() -> None:
 182     # requires line_length=0
 183     source, expected = read_data("miscellaneous", "power_op_newline")
 184     assert_format(source, expected, mode=black.Mode(line_length=0))