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     "pattern_matching_simple",
  66     "pattern_matching_complex",
  67     "pattern_matching_extras",
  68     "pattern_matching_style",
  69     "pattern_matching_generic",
  70     "parenthesized_context_managers",
  71 ]
  72
  73 PREVIEW_CASES: List[str] = [
  74     # string processing
  75     "cantfit",
  76     "comments7",
  77     "long_strings",
  78     "long_strings__edge_case",
  79     "long_strings__regression",
  80     "percent_precedence",
  81 ]
  82
  83 SOURCES: List[str] = [
  84     "src/black/__init__.py",
  85     "src/black/__main__.py",
  86     "src/black/brackets.py",
  87     "src/black/cache.py",
  88     "src/black/comments.py",
  89     "src/black/concurrency.py",
  90     "src/black/const.py",
  91     "src/black/debug.py",
  92     "src/black/files.py",
  93     "src/black/linegen.py",
  94     "src/black/lines.py",
  95     "src/black/mode.py",
  96     "src/black/nodes.py",
  97     "src/black/numerics.py",
  98     "src/black/output.py",
  99     "src/black/parsing.py",
 100     "src/black/report.py",
 101     "src/black/rusty.py",
 102     "src/black/strings.py",
 103     "src/black/trans.py",
 104     "src/blackd/__init__.py",
 105     "src/black_primer/cli.py",
 106     "src/black_primer/lib.py",
 107     "src/blib2to3/pygram.py",
 108     "src/blib2to3/pytree.py",
 109     "src/blib2to3/pgen2/conv.py",
 110     "src/blib2to3/pgen2/driver.py",
 111     "src/blib2to3/pgen2/grammar.py",
 112     "src/blib2to3/pgen2/literals.py",
 113     "src/blib2to3/pgen2/parse.py",
 114     "src/blib2to3/pgen2/pgen.py",
 115     "src/blib2to3/pgen2/tokenize.py",
 116     "src/blib2to3/pgen2/token.py",
 117     "setup.py",
 118     "tests/test_black.py",
 119     "tests/test_blackd.py",
 120     "tests/test_format.py",
 121     "tests/test_primer.py",
 122     "tests/optional.py",
 123     "tests/util.py",
 124     "tests/conftest.py",
 125 ]
 126
 127
 128 @pytest.fixture(autouse=True)
 129 def patch_dump_to_file(request: Any) -> Iterator[None]:
 130     with patch("black.dump_to_file", dump_to_stderr):
 131         yield
 132
 133
 134 def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
 135     source, expected = read_data(filename, data=data)
 136     assert_format(source, expected, mode, fast=False)
 137
 138
 139 @pytest.mark.parametrize("filename", SIMPLE_CASES)
 140 def test_simple_format(filename: str) -> None:
 141     check_file(filename, DEFAULT_MODE)
 142
 143
 144 @pytest.mark.parametrize("filename", PREVIEW_CASES)
 145 def test_preview_format(filename: str) -> None:
 146     check_file(filename, black.Mode(preview=True))
 147
 148
 149 @pytest.mark.parametrize("filename", SOURCES)
 150 def test_source_is_formatted(filename: str) -> None:
 151     path = THIS_DIR.parent / filename
 152     check_file(str(path), DEFAULT_MODE, data=False)
 153
 154
 155 # =============== #
 156 # Complex cases
 157 # ============= #
 158
 159
 160 def test_empty() -> None:
 161     source = expected = ""
 162     assert_format(source, expected)
 163
 164
 165 def test_pep_572() -> None:
 166     source, expected = read_data("pep_572")
 167     assert_format(source, expected, minimum_version=(3, 8))
 168
 169
 170 def test_pep_572_remove_parens() -> None:
 171     source, expected = read_data("pep_572_remove_parens")
 172     assert_format(source, expected, minimum_version=(3, 8))
 173
 174
 175 def test_pep_572_do_not_remove_parens() -> None:
 176     source, expected = read_data("pep_572_do_not_remove_parens")
 177     # the AST safety checks will fail, but that's expected, just make sure no
 178     # parentheses are touched
 179     assert_format(source, expected, fast=True)
 180
 181
 182 @pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
 183 def test_pep_572_newer_syntax(major: int, minor: int) -> None:
 184     source, expected = read_data(f"pep_572_py{major}{minor}")
 185     assert_format(source, expected, minimum_version=(major, minor))
 186
 187
 188 def test_pep_570() -> None:
 189     source, expected = read_data("pep_570")
 190     assert_format(source, expected, minimum_version=(3, 8))
 191
 192
 193 @pytest.mark.parametrize("filename", PY310_CASES)
 194 def test_python_310(filename: str) -> None:
 195     source, expected = read_data(filename)
 196     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 197     assert_format(source, expected, mode, minimum_version=(3, 10))
 198
 199
 200 def test_python_310_without_target_version() -> None:
 201     source, expected = read_data("pattern_matching_simple")
 202     mode = black.Mode()
 203     assert_format(source, expected, mode, minimum_version=(3, 10))
 204
 205
 206 def test_patma_invalid() -> None:
 207     source, expected = read_data("pattern_matching_invalid")
 208     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 209     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 210         assert_format(source, expected, mode, minimum_version=(3, 10))
 211
 212     exc_info.match("Cannot parse: 10:11")
 213
 214
 215 def test_python_2_hint() -> None:
 216     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 217         assert_format("print 'daylily'", "print 'daylily'")
 218     exc_info.match(black.parsing.PY2_HINT)
 219
 220
 221 def test_docstring_no_string_normalization() -> None:
 222     """Like test_docstring but with string normalization off."""
 223     source, expected = read_data("docstring_no_string_normalization")
 224     mode = replace(DEFAULT_MODE, string_normalization=False)
 225     assert_format(source, expected, mode)
 226
 227
 228 def test_long_strings_flag_disabled() -> None:
 229     """Tests for turning off the string processing logic."""
 230     source, expected = read_data("long_strings_flag_disabled")
 231     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 232     assert_format(source, expected, mode)
 233
 234
 235 def test_numeric_literals() -> None:
 236     source, expected = read_data("numeric_literals")
 237     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 238     assert_format(source, expected, mode)
 239
 240
 241 def test_numeric_literals_ignoring_underscores() -> None:
 242     source, expected = read_data("numeric_literals_skip_underscores")
 243     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 244     assert_format(source, expected, mode)
 245
 246
 247 def test_stub() -> None:
 248     mode = replace(DEFAULT_MODE, is_pyi=True)
 249     source, expected = read_data("stub.pyi")
 250     assert_format(source, expected, mode)
 251
 252
 253 def test_python38() -> None:
 254     source, expected = read_data("python38")
 255     assert_format(source, expected, minimum_version=(3, 8))
 256
 257
 258 def test_python39() -> None:
 259     source, expected = read_data("python39")
 260     assert_format(source, expected, minimum_version=(3, 9))
 261
 262
 263 def test_power_op_newline() -> None:
 264     # requires line_length=0
 265     source, expected = read_data("power_op_newline")
 266     assert_format(source, expected, mode=black.Mode(line_length=0))