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     THIS_DIR,
  12     assert_format,
  13     dump_to_stderr,
  14     read_data,
  15 )
  16
  17 SIMPLE_CASES = [
  18     "beginning_backslash",
  19     "bracketmatch",
  20     "class_blank_parentheses",
  21     "class_methods_new_line",
  22     "collections",
  23     "comments",
  24     "comments2",
  25     "comments3",
  26     "comments4",
  27     "comments5",
  28     "comments6",
  29     "comments_non_breaking_space",
  30     "comment_after_escaped_newline",
  31     "composition",
  32     "composition_no_trailing_comma",
  33     "docstring",
  34     "empty_lines",
  35     "expression",
  36     "fmtonoff",
  37     "fmtonoff2",
  38     "fmtonoff3",
  39     "fmtonoff4",
  40     "fmtskip",
  41     "fmtskip2",
  42     "fmtskip3",
  43     "fmtskip4",
  44     "fmtskip5",
  45     "fmtskip6",
  46     "fstring",
  47     "function",
  48     "function2",
  49     "function_trailing_comma",
  50     "import_spacing",
  51     "remove_parens",
  52     "slices",
  53     "string_prefixes",
  54     "tricky_unicode_symbols",
  55     "tupleassign",
  56 ]
  57
  58 EXPERIMENTAL_STRING_PROCESSING_CASES = [
  59     "cantfit",
  60     "comments7",
  61     "long_strings",
  62     "long_strings__edge_case",
  63     "long_strings__regression",
  64     "percent_precedence",
  65 ]
  66
  67 PY310_CASES = [
  68     "pattern_matching_simple",
  69     "pattern_matching_complex",
  70     "pattern_matching_extras",
  71     "pattern_matching_style",
  72     "pattern_matching_generic",
  73     "parenthesized_context_managers",
  74 ]
  75
  76 SOURCES = [
  77     "src/black/__init__.py",
  78     "src/black/__main__.py",
  79     "src/black/brackets.py",
  80     "src/black/cache.py",
  81     "src/black/comments.py",
  82     "src/black/concurrency.py",
  83     "src/black/const.py",
  84     "src/black/debug.py",
  85     "src/black/files.py",
  86     "src/black/linegen.py",
  87     "src/black/lines.py",
  88     "src/black/mode.py",
  89     "src/black/nodes.py",
  90     "src/black/numerics.py",
  91     "src/black/output.py",
  92     "src/black/parsing.py",
  93     "src/black/report.py",
  94     "src/black/rusty.py",
  95     "src/black/strings.py",
  96     "src/black/trans.py",
  97     "src/blackd/__init__.py",
  98     "src/black_primer/cli.py",
  99     "src/black_primer/lib.py",
 100     "src/blib2to3/pygram.py",
 101     "src/blib2to3/pytree.py",
 102     "src/blib2to3/pgen2/conv.py",
 103     "src/blib2to3/pgen2/driver.py",
 104     "src/blib2to3/pgen2/grammar.py",
 105     "src/blib2to3/pgen2/literals.py",
 106     "src/blib2to3/pgen2/parse.py",
 107     "src/blib2to3/pgen2/pgen.py",
 108     "src/blib2to3/pgen2/tokenize.py",
 109     "src/blib2to3/pgen2/token.py",
 110     "setup.py",
 111     "tests/test_black.py",
 112     "tests/test_blackd.py",
 113     "tests/test_format.py",
 114     "tests/test_primer.py",
 115     "tests/optional.py",
 116     "tests/util.py",
 117     "tests/conftest.py",
 118 ]
 119
 120
 121 @pytest.fixture(autouse=True)
 122 def patch_dump_to_file(request: Any) -> Iterator[None]:
 123     with patch("black.dump_to_file", dump_to_stderr):
 124         yield
 125
 126
 127 def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
 128     source, expected = read_data(filename, data=data)
 129     assert_format(source, expected, mode, fast=False)
 130
 131
 132 @pytest.mark.parametrize("filename", SIMPLE_CASES)
 133 def test_simple_format(filename: str) -> None:
 134     check_file(filename, DEFAULT_MODE)
 135
 136
 137 @pytest.mark.parametrize("filename", EXPERIMENTAL_STRING_PROCESSING_CASES)
 138 def test_experimental_format(filename: str) -> None:
 139     check_file(filename, black.Mode(experimental_string_processing=True))
 140
 141
 142 @pytest.mark.parametrize("filename", SOURCES)
 143 def test_source_is_formatted(filename: str) -> None:
 144     path = THIS_DIR.parent / filename
 145     check_file(str(path), DEFAULT_MODE, data=False)
 146
 147
 148 # =============== #
 149 # Complex cases
 150 # ============= #
 151
 152
 153 def test_empty() -> None:
 154     source = expected = ""
 155     assert_format(source, expected)
 156
 157
 158 def test_pep_572() -> None:
 159     source, expected = read_data("pep_572")
 160     assert_format(source, expected, minimum_version=(3, 8))
 161
 162
 163 def test_pep_572_remove_parens() -> None:
 164     source, expected = read_data("pep_572_remove_parens")
 165     assert_format(source, expected, minimum_version=(3, 8))
 166
 167
 168 def test_pep_572_do_not_remove_parens() -> None:
 169     source, expected = read_data("pep_572_do_not_remove_parens")
 170     # the AST safety checks will fail, but that's expected, just make sure no
 171     # parentheses are touched
 172     assert_format(source, expected, fast=True)
 173
 174
 175 @pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
 176 def test_pep_572_newer_syntax(major: int, minor: int) -> None:
 177     source, expected = read_data(f"pep_572_py{major}{minor}")
 178     assert_format(source, expected, minimum_version=(major, minor))
 179
 180
 181 def test_pep_570() -> None:
 182     source, expected = read_data("pep_570")
 183     assert_format(source, expected, minimum_version=(3, 8))
 184
 185
 186 @pytest.mark.parametrize("filename", PY310_CASES)
 187 def test_python_310(filename: str) -> None:
 188     source, expected = read_data(filename)
 189     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 190     assert_format(source, expected, mode, minimum_version=(3, 10))
 191
 192
 193 def test_patma_invalid() -> None:
 194     source, expected = read_data("pattern_matching_invalid")
 195     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 196     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 197         assert_format(source, expected, mode, minimum_version=(3, 10))
 198
 199     exc_info.match("Cannot parse: 10:11")
 200
 201
 202 def test_patma_hint() -> None:
 203     source, expected = read_data("pattern_matching_simple")
 204     mode = black.Mode(target_versions={black.TargetVersion.PY39})
 205     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 206         assert_format(source, expected, mode, minimum_version=(3, 10))
 207
 208     exc_info.match(black.parsing.PY310_HINT)
 209
 210
 211 def test_python_2_hint() -> None:
 212     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 213         assert_format("print 'daylily'", "print 'daylily'")
 214     exc_info.match(black.parsing.PY2_HINT)
 215
 216
 217 def test_docstring_no_string_normalization() -> None:
 218     """Like test_docstring but with string normalization off."""
 219     source, expected = read_data("docstring_no_string_normalization")
 220     mode = replace(DEFAULT_MODE, string_normalization=False)
 221     assert_format(source, expected, mode)
 222
 223
 224 def test_long_strings_flag_disabled() -> None:
 225     """Tests for turning off the string processing logic."""
 226     source, expected = read_data("long_strings_flag_disabled")
 227     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 228     assert_format(source, expected, mode)
 229
 230
 231 def test_numeric_literals() -> None:
 232     source, expected = read_data("numeric_literals")
 233     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 234     assert_format(source, expected, mode)
 235
 236
 237 def test_numeric_literals_ignoring_underscores() -> None:
 238     source, expected = read_data("numeric_literals_skip_underscores")
 239     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 240     assert_format(source, expected, mode)
 241
 242
 243 def test_stub() -> None:
 244     mode = replace(DEFAULT_MODE, is_pyi=True)
 245     source, expected = read_data("stub.pyi")
 246     assert_format(source, expected, mode)
 247
 248
 249 def test_python38() -> None:
 250     source, expected = read_data("python38")
 251     assert_format(source, expected, minimum_version=(3, 8))
 252
 253
 254 def test_python39() -> None:
 255     source, expected = read_data("python39")
 256     assert_format(source, expected, minimum_version=(3, 9))