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Add warning to not run blackd publicly in docs (#3167)
[etc/vim.git] / tests / test_ipynb.py
1 import contextlib
2 from dataclasses import replace
3 import pathlib
4 import re
5 from contextlib import ExitStack as does_not_raise
6 from typing import ContextManager
7
8 from click.testing import CliRunner
9 from black.handle_ipynb_magics import jupyter_dependencies_are_installed
10 from black import (
11     main,
12     NothingChanged,
13     format_cell,
14     format_file_contents,
15     format_file_in_place,
16 )
17 import pytest
18 from black import Mode
19 from _pytest.monkeypatch import MonkeyPatch
20 from tests.util import DATA_DIR, read_jupyter_notebook, get_case_path
21
22 with contextlib.suppress(ModuleNotFoundError):
23     import IPython
24 pytestmark = pytest.mark.jupyter
25 pytest.importorskip("IPython", reason="IPython is an optional dependency")
26 pytest.importorskip("tokenize_rt", reason="tokenize-rt is an optional dependency")
27
28 JUPYTER_MODE = Mode(is_ipynb=True)
29
30 EMPTY_CONFIG = DATA_DIR / "empty_pyproject.toml"
31
32 runner = CliRunner()
33
34
35 def test_noop() -> None:
36     src = 'foo = "a"'
37     with pytest.raises(NothingChanged):
38         format_cell(src, fast=True, mode=JUPYTER_MODE)
39
40
41 @pytest.mark.parametrize("fast", [True, False])
42 def test_trailing_semicolon(fast: bool) -> None:
43     src = 'foo = "a" ;'
44     result = format_cell(src, fast=fast, mode=JUPYTER_MODE)
45     expected = 'foo = "a";'
46     assert result == expected
47
48
49 def test_trailing_semicolon_with_comment() -> None:
50     src = 'foo = "a" ;  # bar'
51     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
52     expected = 'foo = "a";  # bar'
53     assert result == expected
54
55
56 def test_trailing_semicolon_with_comment_on_next_line() -> None:
57     src = "import black;\n\n# this is a comment"
58     with pytest.raises(NothingChanged):
59         format_cell(src, fast=True, mode=JUPYTER_MODE)
60
61
62 def test_trailing_semicolon_indented() -> None:
63     src = "with foo:\n    plot_bar();"
64     with pytest.raises(NothingChanged):
65         format_cell(src, fast=True, mode=JUPYTER_MODE)
66
67
68 def test_trailing_semicolon_noop() -> None:
69     src = 'foo = "a";'
70     with pytest.raises(NothingChanged):
71         format_cell(src, fast=True, mode=JUPYTER_MODE)
72
73
74 @pytest.mark.parametrize(
75     "mode",
76     [
77         pytest.param(JUPYTER_MODE, id="default mode"),
78         pytest.param(
79             replace(JUPYTER_MODE, python_cell_magics={"cust1", "cust1"}),
80             id="custom cell magics mode",
81         ),
82     ],
83 )
84 def test_cell_magic(mode: Mode) -> None:
85     src = "%%time\nfoo =bar"
86     result = format_cell(src, fast=True, mode=mode)
87     expected = "%%time\nfoo = bar"
88     assert result == expected
89
90
91 def test_cell_magic_noop() -> None:
92     src = "%%time\n2 + 2"
93     with pytest.raises(NothingChanged):
94         format_cell(src, fast=True, mode=JUPYTER_MODE)
95
96
97 @pytest.mark.parametrize(
98     "mode",
99     [
100         pytest.param(JUPYTER_MODE, id="default mode"),
101         pytest.param(
102             replace(JUPYTER_MODE, python_cell_magics={"cust1", "cust1"}),
103             id="custom cell magics mode",
104         ),
105     ],
106 )
107 @pytest.mark.parametrize(
108     "src, expected",
109     (
110         pytest.param("ls =!ls", "ls = !ls", id="System assignment"),
111         pytest.param("!ls\n'foo'", '!ls\n"foo"', id="System call"),
112         pytest.param("!!ls\n'foo'", '!!ls\n"foo"', id="Other system call"),
113         pytest.param("?str\n'foo'", '?str\n"foo"', id="Help"),
114         pytest.param("??str\n'foo'", '??str\n"foo"', id="Other help"),
115         pytest.param(
116             "%matplotlib inline\n'foo'",
117             '%matplotlib inline\n"foo"',
118             id="Line magic with argument",
119         ),
120         pytest.param("%time\n'foo'", '%time\n"foo"', id="Line magic without argument"),
121         pytest.param(
122             "env =  %env var", "env = %env var", id="Assignment to environment variable"
123         ),
124         pytest.param("env =  %env", "env = %env", id="Assignment to magic"),
125     ),
126 )
127 def test_magic(src: str, expected: str, mode: Mode) -> None:
128     result = format_cell(src, fast=True, mode=mode)
129     assert result == expected
130
131
132 @pytest.mark.parametrize(
133     "src",
134     (
135         "%%bash\n2+2",
136         "%%html --isolated\n2+2",
137         "%%writefile e.txt\n  meh\n meh",
138     ),
139 )
140 def test_non_python_magics(src: str) -> None:
141     with pytest.raises(NothingChanged):
142         format_cell(src, fast=True, mode=JUPYTER_MODE)
143
144
145 @pytest.mark.skipif(
146     IPython.version_info < (8, 3),
147     reason="Change in how TransformerManager transforms this input",
148 )
149 def test_set_input() -> None:
150     src = "a = b??"
151     expected = "??b"
152     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
153     assert result == expected
154
155
156 def test_input_already_contains_transformed_magic() -> None:
157     src = '%time foo()\nget_ipython().run_cell_magic("time", "", "foo()\\n")'
158     with pytest.raises(NothingChanged):
159         format_cell(src, fast=True, mode=JUPYTER_MODE)
160
161
162 def test_magic_noop() -> None:
163     src = "ls = !ls"
164     with pytest.raises(NothingChanged):
165         format_cell(src, fast=True, mode=JUPYTER_MODE)
166
167
168 def test_cell_magic_with_magic() -> None:
169     src = "%%timeit -n1\nls =!ls"
170     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
171     expected = "%%timeit -n1\nls = !ls"
172     assert result == expected
173
174
175 @pytest.mark.parametrize(
176     "mode, expected_output, expectation",
177     [
178         pytest.param(
179             JUPYTER_MODE,
180             "%%custom_python_magic -n1 -n2\nx=2",
181             pytest.raises(NothingChanged),
182             id="No change when cell magic not registered",
183         ),
184         pytest.param(
185             replace(JUPYTER_MODE, python_cell_magics={"cust1", "cust1"}),
186             "%%custom_python_magic -n1 -n2\nx=2",
187             pytest.raises(NothingChanged),
188             id="No change when other cell magics registered",
189         ),
190         pytest.param(
191             replace(JUPYTER_MODE, python_cell_magics={"custom_python_magic", "cust1"}),
192             "%%custom_python_magic -n1 -n2\nx = 2",
193             does_not_raise(),
194             id="Correctly change when cell magic registered",
195         ),
196     ],
197 )
198 def test_cell_magic_with_custom_python_magic(
199     mode: Mode, expected_output: str, expectation: ContextManager[object]
200 ) -> None:
201     with expectation:
202         result = format_cell(
203             "%%custom_python_magic -n1 -n2\nx=2",
204             fast=True,
205             mode=mode,
206         )
207         assert result == expected_output
208
209
210 def test_cell_magic_nested() -> None:
211     src = "%%time\n%%time\n2+2"
212     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
213     expected = "%%time\n%%time\n2 + 2"
214     assert result == expected
215
216
217 def test_cell_magic_with_magic_noop() -> None:
218     src = "%%t -n1\nls = !ls"
219     with pytest.raises(NothingChanged):
220         format_cell(src, fast=True, mode=JUPYTER_MODE)
221
222
223 def test_automagic() -> None:
224     src = "pip install black"
225     with pytest.raises(NothingChanged):
226         format_cell(src, fast=True, mode=JUPYTER_MODE)
227
228
229 def test_multiline_magic() -> None:
230     src = "%time 1 + \\\n2"
231     with pytest.raises(NothingChanged):
232         format_cell(src, fast=True, mode=JUPYTER_MODE)
233
234
235 def test_multiline_no_magic() -> None:
236     src = "1 + \\\n2"
237     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
238     expected = "1 + 2"
239     assert result == expected
240
241
242 def test_cell_magic_with_invalid_body() -> None:
243     src = "%%time\nif True"
244     with pytest.raises(NothingChanged):
245         format_cell(src, fast=True, mode=JUPYTER_MODE)
246
247
248 def test_empty_cell() -> None:
249     src = ""
250     with pytest.raises(NothingChanged):
251         format_cell(src, fast=True, mode=JUPYTER_MODE)
252
253
254 def test_entire_notebook_empty_metadata() -> None:
255     content = read_jupyter_notebook("jupyter", "notebook_empty_metadata")
256     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
257     expected = (
258         "{\n"
259         ' "cells": [\n'
260         "  {\n"
261         '   "cell_type": "code",\n'
262         '   "execution_count": null,\n'
263         '   "metadata": {\n'
264         '    "tags": []\n'
265         "   },\n"
266         '   "outputs": [],\n'
267         '   "source": [\n'
268         '    "%%time\\n",\n'
269         '    "\\n",\n'
270         '    "print(\\"foo\\")"\n'
271         "   ]\n"
272         "  },\n"
273         "  {\n"
274         '   "cell_type": "code",\n'
275         '   "execution_count": null,\n'
276         '   "metadata": {},\n'
277         '   "outputs": [],\n'
278         '   "source": []\n'
279         "  }\n"
280         " ],\n"
281         ' "metadata": {},\n'
282         ' "nbformat": 4,\n'
283         ' "nbformat_minor": 4\n'
284         "}\n"
285     )
286     assert result == expected
287
288
289 def test_entire_notebook_trailing_newline() -> None:
290     content = read_jupyter_notebook("jupyter", "notebook_trailing_newline")
291     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
292     expected = (
293         "{\n"
294         ' "cells": [\n'
295         "  {\n"
296         '   "cell_type": "code",\n'
297         '   "execution_count": null,\n'
298         '   "metadata": {\n'
299         '    "tags": []\n'
300         "   },\n"
301         '   "outputs": [],\n'
302         '   "source": [\n'
303         '    "%%time\\n",\n'
304         '    "\\n",\n'
305         '    "print(\\"foo\\")"\n'
306         "   ]\n"
307         "  },\n"
308         "  {\n"
309         '   "cell_type": "code",\n'
310         '   "execution_count": null,\n'
311         '   "metadata": {},\n'
312         '   "outputs": [],\n'
313         '   "source": []\n'
314         "  }\n"
315         " ],\n"
316         ' "metadata": {\n'
317         '  "interpreter": {\n'
318         '   "hash": "e758f3098b5b55f4d87fe30bbdc1367f20f246b483f96267ee70e6c40cb185d8"\n'  # noqa:B950
319         "  },\n"
320         '  "kernelspec": {\n'
321         '   "display_name": "Python 3.8.10 64-bit (\'black\': venv)",\n'
322         '   "name": "python3"\n'
323         "  },\n"
324         '  "language_info": {\n'
325         '   "name": "python",\n'
326         '   "version": ""\n'
327         "  }\n"
328         " },\n"
329         ' "nbformat": 4,\n'
330         ' "nbformat_minor": 4\n'
331         "}\n"
332     )
333     assert result == expected
334
335
336 def test_entire_notebook_no_trailing_newline() -> None:
337     content = read_jupyter_notebook("jupyter", "notebook_no_trailing_newline")
338     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
339     expected = (
340         "{\n"
341         ' "cells": [\n'
342         "  {\n"
343         '   "cell_type": "code",\n'
344         '   "execution_count": null,\n'
345         '   "metadata": {\n'
346         '    "tags": []\n'
347         "   },\n"
348         '   "outputs": [],\n'
349         '   "source": [\n'
350         '    "%%time\\n",\n'
351         '    "\\n",\n'
352         '    "print(\\"foo\\")"\n'
353         "   ]\n"
354         "  },\n"
355         "  {\n"
356         '   "cell_type": "code",\n'
357         '   "execution_count": null,\n'
358         '   "metadata": {},\n'
359         '   "outputs": [],\n'
360         '   "source": []\n'
361         "  }\n"
362         " ],\n"
363         ' "metadata": {\n'
364         '  "interpreter": {\n'
365         '   "hash": "e758f3098b5b55f4d87fe30bbdc1367f20f246b483f96267ee70e6c40cb185d8"\n'  # noqa: B950
366         "  },\n"
367         '  "kernelspec": {\n'
368         '   "display_name": "Python 3.8.10 64-bit (\'black\': venv)",\n'
369         '   "name": "python3"\n'
370         "  },\n"
371         '  "language_info": {\n'
372         '   "name": "python",\n'
373         '   "version": ""\n'
374         "  }\n"
375         " },\n"
376         ' "nbformat": 4,\n'
377         ' "nbformat_minor": 4\n'
378         "}"
379     )
380     assert result == expected
381
382
383 def test_entire_notebook_without_changes() -> None:
384     content = read_jupyter_notebook("jupyter", "notebook_without_changes")
385     with pytest.raises(NothingChanged):
386         format_file_contents(content, fast=True, mode=JUPYTER_MODE)
387
388
389 def test_non_python_notebook() -> None:
390     content = read_jupyter_notebook("jupyter", "non_python_notebook")
391
392     with pytest.raises(NothingChanged):
393         format_file_contents(content, fast=True, mode=JUPYTER_MODE)
394
395
396 def test_empty_string() -> None:
397     with pytest.raises(NothingChanged):
398         format_file_contents("", fast=True, mode=JUPYTER_MODE)
399
400
401 def test_unparseable_notebook() -> None:
402     path = get_case_path("jupyter", "notebook_which_cant_be_parsed.ipynb")
403     msg = rf"File '{re.escape(str(path))}' cannot be parsed as valid Jupyter notebook\."
404     with pytest.raises(ValueError, match=msg):
405         format_file_in_place(path, fast=True, mode=JUPYTER_MODE)
406
407
408 def test_ipynb_diff_with_change() -> None:
409     result = runner.invoke(
410         main,
411         [
412             str(get_case_path("jupyter", "notebook_trailing_newline.ipynb")),
413             "--diff",
414             f"--config={EMPTY_CONFIG}",
415         ],
416     )
417     expected = "@@ -1,3 +1,3 @@\n %%time\n \n-print('foo')\n+print(\"foo\")\n"
418     assert expected in result.output
419
420
421 def test_ipynb_diff_with_no_change() -> None:
422     result = runner.invoke(
423         main,
424         [
425             str(get_case_path("jupyter", "notebook_without_changes.ipynb")),
426             "--diff",
427             f"--config={EMPTY_CONFIG}",
428         ],
429     )
430     expected = "1 file would be left unchanged."
431     assert expected in result.output
432
433
434 def test_cache_isnt_written_if_no_jupyter_deps_single(
435     monkeypatch: MonkeyPatch, tmp_path: pathlib.Path
436 ) -> None:
437     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
438     jupyter_dependencies_are_installed.cache_clear()
439     nb = get_case_path("jupyter", "notebook_trailing_newline.ipynb")
440     tmp_nb = tmp_path / "notebook.ipynb"
441     with open(nb) as src, open(tmp_nb, "w") as dst:
442         dst.write(src.read())
443     monkeypatch.setattr(
444         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: False
445     )
446     result = runner.invoke(
447         main, [str(tmp_path / "notebook.ipynb"), f"--config={EMPTY_CONFIG}"]
448     )
449     assert "No Python files are present to be formatted. Nothing to do" in result.output
450     jupyter_dependencies_are_installed.cache_clear()
451     monkeypatch.setattr(
452         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: True
453     )
454     result = runner.invoke(
455         main, [str(tmp_path / "notebook.ipynb"), f"--config={EMPTY_CONFIG}"]
456     )
457     assert "reformatted" in result.output
458
459
460 def test_cache_isnt_written_if_no_jupyter_deps_dir(
461     monkeypatch: MonkeyPatch, tmp_path: pathlib.Path
462 ) -> None:
463     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
464     jupyter_dependencies_are_installed.cache_clear()
465     nb = get_case_path("jupyter", "notebook_trailing_newline.ipynb")
466     tmp_nb = tmp_path / "notebook.ipynb"
467     with open(nb) as src, open(tmp_nb, "w") as dst:
468         dst.write(src.read())
469     monkeypatch.setattr(
470         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: False
471     )
472     result = runner.invoke(main, [str(tmp_path), f"--config={EMPTY_CONFIG}"])
473     assert "No Python files are present to be formatted. Nothing to do" in result.output
474     jupyter_dependencies_are_installed.cache_clear()
475     monkeypatch.setattr(
476         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: True
477     )
478     result = runner.invoke(main, [str(tmp_path), f"--config={EMPTY_CONFIG}"])
479     assert "reformatted" in result.output
480
481
482 def test_ipynb_flag(tmp_path: pathlib.Path) -> None:
483     nb = get_case_path("jupyter", "notebook_trailing_newline.ipynb")
484     tmp_nb = tmp_path / "notebook.a_file_extension_which_is_definitely_not_ipynb"
485     with open(nb) as src, open(tmp_nb, "w") as dst:
486         dst.write(src.read())
487     result = runner.invoke(
488         main,
489         [
490             str(tmp_nb),
491             "--diff",
492             "--ipynb",
493             f"--config={EMPTY_CONFIG}",
494         ],
495     )
496     expected = "@@ -1,3 +1,3 @@\n %%time\n \n-print('foo')\n+print(\"foo\")\n"
497     assert expected in result.output
498
499
500 def test_ipynb_and_pyi_flags() -> None:
501     nb = get_case_path("jupyter", "notebook_trailing_newline.ipynb")
502     result = runner.invoke(
503         main,
504         [
505             str(nb),
506             "--pyi",
507             "--ipynb",
508             "--diff",
509             f"--config={EMPTY_CONFIG}",
510         ],
511     )
512     assert isinstance(result.exception, SystemExit)
513     expected = "Cannot pass both `pyi` and `ipynb` flags!\n"
514     assert result.output == expected
515
516
517 def test_unable_to_replace_magics(monkeypatch: MonkeyPatch) -> None:
518     src = "%%time\na = 'foo'"
519     monkeypatch.setattr("black.handle_ipynb_magics.TOKEN_HEX", lambda _: "foo")
520     with pytest.raises(
521         AssertionError, match="Black was not able to replace IPython magic"
522     ):
523         format_cell(src, fast=True, mode=JUPYTER_MODE)