tests/test_format.py

   1 from dataclasses import replace
   2 from typing import Any, Iterator, List
   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     THIS_DIR,
  12     assert_format,
  13     dump_to_stderr,
  14     read_data,
  15 )
  16
  17 SIMPLE_CASES: List[str] = [
  18     "attribute_access_on_number_literals",
  19     "beginning_backslash",
  20     "bracketmatch",
  21     "class_blank_parentheses",
  22     "class_methods_new_line",
  23     "collections",
  24     "comments",
  25     "comments2",
  26     "comments3",
  27     "comments4",
  28     "comments5",
  29     "comments6",
  30     "comments_non_breaking_space",
  31     "comment_after_escaped_newline",
  32     "composition",
  33     "composition_no_trailing_comma",
  34     "docstring",
  35     "empty_lines",
  36     "expression",
  37     "fmtonoff",
  38     "fmtonoff2",
  39     "fmtonoff3",
  40     "fmtonoff4",
  41     "fmtskip",
  42     "fmtskip2",
  43     "fmtskip3",
  44     "fmtskip4",
  45     "fmtskip5",
  46     "fmtskip6",
  47     "fstring",
  48     "function",
  49     "function2",
  50     "function_trailing_comma",
  51     "import_spacing",
  52     "power_op_spacing",
  53     "remove_parens",
  54     "slices",
  55     "string_prefixes",
  56     "torture",
  57     "trailing_comma_optional_parens1",
  58     "trailing_comma_optional_parens2",
  59     "trailing_comma_optional_parens3",
  60     "tricky_unicode_symbols",
  61     "tupleassign",
  62 ]
  63
  64 PY310_CASES: List[str] = [
  65     "starred_for_target",
  66     "pattern_matching_simple",
  67     "pattern_matching_complex",
  68     "pattern_matching_extras",
  69     "pattern_matching_style",
  70     "pattern_matching_generic",
  71     "parenthesized_context_managers",
  72 ]
  73
  74 PREVIEW_CASES: List[str] = [
  75     # string processing
  76     "cantfit",
  77     "comments7",
  78     "long_strings",
  79     "long_strings__edge_case",
  80     "long_strings__regression",
  81     "percent_precedence",
  82 ]
  83
  84 SOURCES: List[str] = [
  85     "src/black/__init__.py",
  86     "src/black/__main__.py",
  87     "src/black/brackets.py",
  88     "src/black/cache.py",
  89     "src/black/comments.py",
  90     "src/black/concurrency.py",
  91     "src/black/const.py",
  92     "src/black/debug.py",
  93     "src/black/files.py",
  94     "src/black/linegen.py",
  95     "src/black/lines.py",
  96     "src/black/mode.py",
  97     "src/black/nodes.py",
  98     "src/black/numerics.py",
  99     "src/black/output.py",
 100     "src/black/parsing.py",
 101     "src/black/report.py",
 102     "src/black/rusty.py",
 103     "src/black/strings.py",
 104     "src/black/trans.py",
 105     "src/blackd/__init__.py",
 106     "src/blib2to3/pygram.py",
 107     "src/blib2to3/pytree.py",
 108     "src/blib2to3/pgen2/conv.py",
 109     "src/blib2to3/pgen2/driver.py",
 110     "src/blib2to3/pgen2/grammar.py",
 111     "src/blib2to3/pgen2/literals.py",
 112     "src/blib2to3/pgen2/parse.py",
 113     "src/blib2to3/pgen2/pgen.py",
 114     "src/blib2to3/pgen2/tokenize.py",
 115     "src/blib2to3/pgen2/token.py",
 116     "setup.py",
 117     "tests/test_black.py",
 118     "tests/test_blackd.py",
 119     "tests/test_format.py",
 120     "tests/optional.py",
 121     "tests/util.py",
 122     "tests/conftest.py",
 123 ]
 124
 125
 126 @pytest.fixture(autouse=True)
 127 def patch_dump_to_file(request: Any) -> Iterator[None]:
 128     with patch("black.dump_to_file", dump_to_stderr):
 129         yield
 130
 131
 132 def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
 133     source, expected = read_data(filename, data=data)
 134     assert_format(source, expected, mode, fast=False)
 135
 136
 137 @pytest.mark.parametrize("filename", SIMPLE_CASES)
 138 def test_simple_format(filename: str) -> None:
 139     check_file(filename, DEFAULT_MODE)
 140
 141
 142 @pytest.mark.parametrize("filename", PREVIEW_CASES)
 143 def test_preview_format(filename: str) -> None:
 144     check_file(filename, black.Mode(preview=True))
 145
 146
 147 @pytest.mark.parametrize("filename", SOURCES)
 148 def test_source_is_formatted(filename: str) -> None:
 149     path = THIS_DIR.parent / filename
 150     check_file(str(path), DEFAULT_MODE, data=False)
 151
 152
 153 # =============== #
 154 # Complex cases
 155 # ============= #
 156
 157
 158 def test_empty() -> None:
 159     source = expected = ""
 160     assert_format(source, expected)
 161
 162
 163 def test_pep_572() -> None:
 164     source, expected = read_data("pep_572")
 165     assert_format(source, expected, minimum_version=(3, 8))
 166
 167
 168 def test_pep_572_remove_parens() -> None:
 169     source, expected = read_data("pep_572_remove_parens")
 170     assert_format(source, expected, minimum_version=(3, 8))
 171
 172
 173 def test_pep_572_do_not_remove_parens() -> None:
 174     source, expected = read_data("pep_572_do_not_remove_parens")
 175     # the AST safety checks will fail, but that's expected, just make sure no
 176     # parentheses are touched
 177     assert_format(source, expected, fast=True)
 178
 179
 180 @pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
 181 def test_pep_572_newer_syntax(major: int, minor: int) -> None:
 182     source, expected = read_data(f"pep_572_py{major}{minor}")
 183     assert_format(source, expected, minimum_version=(major, minor))
 184
 185
 186 def test_pep_570() -> None:
 187     source, expected = read_data("pep_570")
 188     assert_format(source, expected, minimum_version=(3, 8))
 189
 190
 191 @pytest.mark.parametrize("filename", PY310_CASES)
 192 def test_python_310(filename: str) -> None:
 193     source, expected = read_data(filename)
 194     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 195     assert_format(source, expected, mode, minimum_version=(3, 10))
 196
 197
 198 def test_python_310_without_target_version() -> None:
 199     source, expected = read_data("pattern_matching_simple")
 200     mode = black.Mode()
 201     assert_format(source, expected, mode, minimum_version=(3, 10))
 202
 203
 204 def test_patma_invalid() -> None:
 205     source, expected = read_data("pattern_matching_invalid")
 206     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 207     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 208         assert_format(source, expected, mode, minimum_version=(3, 10))
 209
 210     exc_info.match("Cannot parse: 10:11")
 211
 212
 213 def test_python_2_hint() -> None:
 214     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 215         assert_format("print 'daylily'", "print 'daylily'")
 216     exc_info.match(black.parsing.PY2_HINT)
 217
 218
 219 def test_docstring_no_string_normalization() -> None:
 220     """Like test_docstring but with string normalization off."""
 221     source, expected = read_data("docstring_no_string_normalization")
 222     mode = replace(DEFAULT_MODE, string_normalization=False)
 223     assert_format(source, expected, mode)
 224
 225
 226 def test_long_strings_flag_disabled() -> None:
 227     """Tests for turning off the string processing logic."""
 228     source, expected = read_data("long_strings_flag_disabled")
 229     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 230     assert_format(source, expected, mode)
 231
 232
 233 def test_numeric_literals() -> None:
 234     source, expected = read_data("numeric_literals")
 235     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 236     assert_format(source, expected, mode)
 237
 238
 239 def test_numeric_literals_ignoring_underscores() -> None:
 240     source, expected = read_data("numeric_literals_skip_underscores")
 241     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 242     assert_format(source, expected, mode)
 243
 244
 245 def test_stub() -> None:
 246     mode = replace(DEFAULT_MODE, is_pyi=True)
 247     source, expected = read_data("stub.pyi")
 248     assert_format(source, expected, mode)
 249
 250
 251 def test_python38() -> None:
 252     source, expected = read_data("python38")
 253     assert_format(source, expected, minimum_version=(3, 8))
 254
 255
 256 def test_python39() -> None:
 257     source, expected = read_data("python39")
 258     assert_format(source, expected, minimum_version=(3, 9))
 259
 260
 261 def test_power_op_newline() -> None:
 262     # requires line_length=0
 263     source, expected = read_data("power_op_newline")
 264     assert_format(source, expected, mode=black.Mode(line_length=0))