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     "comments8",
  79     "long_strings",
  80     "long_strings__edge_case",
  81     "long_strings__regression",
  82     "percent_precedence",
  83     "remove_for_brackets",
  84     "one_element_subscript",
  85 ]
  86
  87 SOURCES: List[str] = [
  88     "src/black/__init__.py",
  89     "src/black/__main__.py",
  90     "src/black/brackets.py",
  91     "src/black/cache.py",
  92     "src/black/comments.py",
  93     "src/black/concurrency.py",
  94     "src/black/const.py",
  95     "src/black/debug.py",
  96     "src/black/files.py",
  97     "src/black/linegen.py",
  98     "src/black/lines.py",
  99     "src/black/mode.py",
 100     "src/black/nodes.py",
 101     "src/black/numerics.py",
 102     "src/black/output.py",
 103     "src/black/parsing.py",
 104     "src/black/report.py",
 105     "src/black/rusty.py",
 106     "src/black/strings.py",
 107     "src/black/trans.py",
 108     "src/blackd/__init__.py",
 109     "src/blib2to3/pygram.py",
 110     "src/blib2to3/pytree.py",
 111     "src/blib2to3/pgen2/conv.py",
 112     "src/blib2to3/pgen2/driver.py",
 113     "src/blib2to3/pgen2/grammar.py",
 114     "src/blib2to3/pgen2/literals.py",
 115     "src/blib2to3/pgen2/parse.py",
 116     "src/blib2to3/pgen2/pgen.py",
 117     "src/blib2to3/pgen2/tokenize.py",
 118     "src/blib2to3/pgen2/token.py",
 119     "setup.py",
 120     "tests/test_black.py",
 121     "tests/test_blackd.py",
 122     "tests/test_format.py",
 123     "tests/optional.py",
 124     "tests/util.py",
 125     "tests/conftest.py",
 126 ]
 127
 128
 129 @pytest.fixture(autouse=True)
 130 def patch_dump_to_file(request: Any) -> Iterator[None]:
 131     with patch("black.dump_to_file", dump_to_stderr):
 132         yield
 133
 134
 135 def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
 136     source, expected = read_data(filename, data=data)
 137     assert_format(source, expected, mode, fast=False)
 138
 139
 140 @pytest.mark.parametrize("filename", SIMPLE_CASES)
 141 def test_simple_format(filename: str) -> None:
 142     check_file(filename, DEFAULT_MODE)
 143
 144
 145 @pytest.mark.parametrize("filename", PREVIEW_CASES)
 146 def test_preview_format(filename: str) -> None:
 147     check_file(filename, black.Mode(preview=True))
 148
 149
 150 @pytest.mark.parametrize("filename", SOURCES)
 151 def test_source_is_formatted(filename: str) -> None:
 152     path = THIS_DIR.parent / filename
 153     check_file(str(path), DEFAULT_MODE, data=False)
 154
 155
 156 # =============== #
 157 # Complex cases
 158 # ============= #
 159
 160
 161 def test_empty() -> None:
 162     source = expected = ""
 163     assert_format(source, expected)
 164
 165
 166 def test_pep_572() -> None:
 167     source, expected = read_data("pep_572")
 168     assert_format(source, expected, minimum_version=(3, 8))
 169
 170
 171 def test_pep_572_remove_parens() -> None:
 172     source, expected = read_data("pep_572_remove_parens")
 173     assert_format(source, expected, minimum_version=(3, 8))
 174
 175
 176 def test_pep_572_do_not_remove_parens() -> None:
 177     source, expected = read_data("pep_572_do_not_remove_parens")
 178     # the AST safety checks will fail, but that's expected, just make sure no
 179     # parentheses are touched
 180     assert_format(source, expected, fast=True)
 181
 182
 183 @pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
 184 def test_pep_572_newer_syntax(major: int, minor: int) -> None:
 185     source, expected = read_data(f"pep_572_py{major}{minor}")
 186     assert_format(source, expected, minimum_version=(major, minor))
 187
 188
 189 def test_pep_570() -> None:
 190     source, expected = read_data("pep_570")
 191     assert_format(source, expected, minimum_version=(3, 8))
 192
 193
 194 @pytest.mark.parametrize("filename", PY310_CASES)
 195 def test_python_310(filename: str) -> None:
 196     source, expected = read_data(filename)
 197     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 198     assert_format(source, expected, mode, minimum_version=(3, 10))
 199
 200
 201 def test_python_310_without_target_version() -> None:
 202     source, expected = read_data("pattern_matching_simple")
 203     mode = black.Mode()
 204     assert_format(source, expected, mode, minimum_version=(3, 10))
 205
 206
 207 def test_patma_invalid() -> None:
 208     source, expected = read_data("pattern_matching_invalid")
 209     mode = black.Mode(target_versions={black.TargetVersion.PY310})
 210     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 211         assert_format(source, expected, mode, minimum_version=(3, 10))
 212
 213     exc_info.match("Cannot parse: 10:11")
 214
 215
 216 def test_python_2_hint() -> None:
 217     with pytest.raises(black.parsing.InvalidInput) as exc_info:
 218         assert_format("print 'daylily'", "print 'daylily'")
 219     exc_info.match(black.parsing.PY2_HINT)
 220
 221
 222 def test_docstring_no_string_normalization() -> None:
 223     """Like test_docstring but with string normalization off."""
 224     source, expected = read_data("docstring_no_string_normalization")
 225     mode = replace(DEFAULT_MODE, string_normalization=False)
 226     assert_format(source, expected, mode)
 227
 228
 229 def test_long_strings_flag_disabled() -> None:
 230     """Tests for turning off the string processing logic."""
 231     source, expected = read_data("long_strings_flag_disabled")
 232     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 233     assert_format(source, expected, mode)
 234
 235
 236 def test_numeric_literals() -> None:
 237     source, expected = read_data("numeric_literals")
 238     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 239     assert_format(source, expected, mode)
 240
 241
 242 def test_numeric_literals_ignoring_underscores() -> None:
 243     source, expected = read_data("numeric_literals_skip_underscores")
 244     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 245     assert_format(source, expected, mode)
 246
 247
 248 def test_stub() -> None:
 249     mode = replace(DEFAULT_MODE, is_pyi=True)
 250     source, expected = read_data("stub.pyi")
 251     assert_format(source, expected, mode)
 252
 253
 254 def test_python38() -> None:
 255     source, expected = read_data("python38")
 256     assert_format(source, expected, minimum_version=(3, 8))
 257
 258
 259 def test_python39() -> None:
 260     source, expected = read_data("python39")
 261     assert_format(source, expected, minimum_version=(3, 9))
 262
 263
 264 def test_power_op_newline() -> None:
 265     # requires line_length=0
 266     source, expected = read_data("power_op_newline")
 267     assert_format(source, expected, mode=black.Mode(line_length=0))