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 SIMPLE_CASES_PY2 = [
  59     "numeric_literals_py2",
  60     "python2",
  61     "python2_unicode_literals",
  62 ]
  63
  64 EXPERIMENTAL_STRING_PROCESSING_CASES = [
  65     "cantfit",
  66     "comments7",
  67     "long_strings",
  68     "long_strings__edge_case",
  69     "long_strings__regression",
  70     "percent_precedence",
  71 ]
  72
  73
  74 SOURCES = [
  75     "src/black/__init__.py",
  76     "src/black/__main__.py",
  77     "src/black/brackets.py",
  78     "src/black/cache.py",
  79     "src/black/comments.py",
  80     "src/black/concurrency.py",
  81     "src/black/const.py",
  82     "src/black/debug.py",
  83     "src/black/files.py",
  84     "src/black/linegen.py",
  85     "src/black/lines.py",
  86     "src/black/mode.py",
  87     "src/black/nodes.py",
  88     "src/black/numerics.py",
  89     "src/black/output.py",
  90     "src/black/parsing.py",
  91     "src/black/report.py",
  92     "src/black/rusty.py",
  93     "src/black/strings.py",
  94     "src/black/trans.py",
  95     "src/blackd/__init__.py",
  96     "src/blib2to3/pygram.py",
  97     "src/blib2to3/pytree.py",
  98     "src/blib2to3/pgen2/conv.py",
  99     "src/blib2to3/pgen2/driver.py",
 100     "src/blib2to3/pgen2/grammar.py",
 101     "src/blib2to3/pgen2/literals.py",
 102     "src/blib2to3/pgen2/parse.py",
 103     "src/blib2to3/pgen2/pgen.py",
 104     "src/blib2to3/pgen2/tokenize.py",
 105     "src/blib2to3/pgen2/token.py",
 106     "setup.py",
 107     "tests/test_black.py",
 108     "tests/test_blackd.py",
 109     "tests/test_format.py",
 110     "tests/test_primer.py",
 111     "tests/optional.py",
 112     "tests/util.py",
 113     "tests/conftest.py",
 114 ]
 115
 116
 117 @pytest.fixture(autouse=True)
 118 def patch_dump_to_file(request: Any) -> Iterator[None]:
 119     with patch("black.dump_to_file", dump_to_stderr):
 120         yield
 121
 122
 123 def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
 124     source, expected = read_data(filename, data=data)
 125     assert_format(source, expected, mode, fast=False)
 126
 127
 128 @pytest.mark.parametrize("filename", SIMPLE_CASES_PY2)
 129 @pytest.mark.python2
 130 def test_simple_format_py2(filename: str) -> None:
 131     check_file(filename, DEFAULT_MODE)
 132
 133
 134 @pytest.mark.parametrize("filename", SIMPLE_CASES)
 135 def test_simple_format(filename: str) -> None:
 136     check_file(filename, DEFAULT_MODE)
 137
 138
 139 @pytest.mark.parametrize("filename", EXPERIMENTAL_STRING_PROCESSING_CASES)
 140 def test_experimental_format(filename: str) -> None:
 141     check_file(filename, black.Mode(experimental_string_processing=True))
 142
 143
 144 @pytest.mark.parametrize("filename", SOURCES)
 145 def test_source_is_formatted(filename: str) -> None:
 146     path = THIS_DIR.parent / filename
 147     check_file(str(path), DEFAULT_MODE, data=False)
 148
 149
 150 # =============== #
 151 # Complex cases
 152 # ============= #
 153
 154
 155 def test_empty() -> None:
 156     source = expected = ""
 157     assert_format(source, expected)
 158
 159
 160 def test_pep_572() -> None:
 161     source, expected = read_data("pep_572")
 162     assert_format(source, expected, minimum_version=(3, 8))
 163
 164
 165 def test_pep_572_remove_parens() -> None:
 166     source, expected = read_data("pep_572_remove_parens")
 167     assert_format(source, expected, minimum_version=(3, 8))
 168
 169
 170 def test_pep_572_do_not_remove_parens() -> None:
 171     source, expected = read_data("pep_572_do_not_remove_parens")
 172     # the AST safety checks will fail, but that's expected, just make sure no
 173     # parentheses are touched
 174     assert_format(source, expected, fast=True)
 175
 176
 177 @pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
 178 def test_pep_572_newer_syntax(major: int, minor: int) -> None:
 179     source, expected = read_data(f"pep_572_py{major}{minor}")
 180     assert_format(source, expected, minimum_version=(major, minor))
 181
 182
 183 def test_pep_570() -> None:
 184     source, expected = read_data("pep_570")
 185     assert_format(source, expected, minimum_version=(3, 8))
 186
 187
 188 def test_docstring_no_string_normalization() -> None:
 189     """Like test_docstring but with string normalization off."""
 190     source, expected = read_data("docstring_no_string_normalization")
 191     mode = replace(DEFAULT_MODE, string_normalization=False)
 192     assert_format(source, expected, mode)
 193
 194
 195 def test_long_strings_flag_disabled() -> None:
 196     """Tests for turning off the string processing logic."""
 197     source, expected = read_data("long_strings_flag_disabled")
 198     mode = replace(DEFAULT_MODE, experimental_string_processing=False)
 199     assert_format(source, expected, mode)
 200
 201
 202 def test_numeric_literals() -> None:
 203     source, expected = read_data("numeric_literals")
 204     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 205     assert_format(source, expected, mode)
 206
 207
 208 def test_numeric_literals_ignoring_underscores() -> None:
 209     source, expected = read_data("numeric_literals_skip_underscores")
 210     mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
 211     assert_format(source, expected, mode)
 212
 213
 214 @pytest.mark.python2
 215 def test_python2_print_function() -> None:
 216     source, expected = read_data("python2_print_function")
 217     mode = replace(DEFAULT_MODE, target_versions={black.TargetVersion.PY27})
 218     assert_format(source, expected, mode)
 219
 220
 221 def test_stub() -> None:
 222     mode = replace(DEFAULT_MODE, is_pyi=True)
 223     source, expected = read_data("stub.pyi")
 224     assert_format(source, expected, mode)
 225
 226
 227 def test_python38() -> None:
 228     source, expected = read_data("python38")
 229     assert_format(source, expected, minimum_version=(3, 8))
 230
 231
 232 def test_python39() -> None:
 233     source, expected = read_data("python39")
 234     assert_format(source, expected, minimum_version=(3, 9))