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Update CHANGES.md for 21.10b0 release (#2583)
[etc/vim.git] / tests / test_ipynb.py
1 import re
2
3 from click.testing import CliRunner
4 from black.handle_ipynb_magics import jupyter_dependencies_are_installed
5 from black import (
6     main,
7     NothingChanged,
8     format_cell,
9     format_file_contents,
10     format_file_in_place,
11 )
12 import pytest
13 from black import Mode
14 from _pytest.monkeypatch import MonkeyPatch
15 from py.path import local
16 from tests.util import DATA_DIR
17
18 pytestmark = pytest.mark.jupyter
19 pytest.importorskip("IPython", reason="IPython is an optional dependency")
20 pytest.importorskip("tokenize_rt", reason="tokenize-rt is an optional dependency")
21
22 JUPYTER_MODE = Mode(is_ipynb=True)
23
24 runner = CliRunner()
25
26
27 def test_noop() -> None:
28     src = 'foo = "a"'
29     with pytest.raises(NothingChanged):
30         format_cell(src, fast=True, mode=JUPYTER_MODE)
31
32
33 @pytest.mark.parametrize("fast", [True, False])
34 def test_trailing_semicolon(fast: bool) -> None:
35     src = 'foo = "a" ;'
36     result = format_cell(src, fast=fast, mode=JUPYTER_MODE)
37     expected = 'foo = "a";'
38     assert result == expected
39
40
41 def test_trailing_semicolon_with_comment() -> None:
42     src = 'foo = "a" ;  # bar'
43     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
44     expected = 'foo = "a";  # bar'
45     assert result == expected
46
47
48 def test_trailing_semicolon_with_comment_on_next_line() -> None:
49     src = "import black;\n\n# this is a comment"
50     with pytest.raises(NothingChanged):
51         format_cell(src, fast=True, mode=JUPYTER_MODE)
52
53
54 def test_trailing_semicolon_indented() -> None:
55     src = "with foo:\n    plot_bar();"
56     with pytest.raises(NothingChanged):
57         format_cell(src, fast=True, mode=JUPYTER_MODE)
58
59
60 def test_trailing_semicolon_noop() -> None:
61     src = 'foo = "a";'
62     with pytest.raises(NothingChanged):
63         format_cell(src, fast=True, mode=JUPYTER_MODE)
64
65
66 def test_cell_magic() -> None:
67     src = "%%time\nfoo =bar"
68     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
69     expected = "%%time\nfoo = bar"
70     assert result == expected
71
72
73 def test_cell_magic_noop() -> None:
74     src = "%%time\n2 + 2"
75     with pytest.raises(NothingChanged):
76         format_cell(src, fast=True, mode=JUPYTER_MODE)
77
78
79 @pytest.mark.parametrize(
80     "src, expected",
81     (
82         pytest.param("ls =!ls", "ls = !ls", id="System assignment"),
83         pytest.param("!ls\n'foo'", '!ls\n"foo"', id="System call"),
84         pytest.param("!!ls\n'foo'", '!!ls\n"foo"', id="Other system call"),
85         pytest.param("?str\n'foo'", '?str\n"foo"', id="Help"),
86         pytest.param("??str\n'foo'", '??str\n"foo"', id="Other help"),
87         pytest.param(
88             "%matplotlib inline\n'foo'",
89             '%matplotlib inline\n"foo"',
90             id="Line magic with argument",
91         ),
92         pytest.param("%time\n'foo'", '%time\n"foo"', id="Line magic without argument"),
93     ),
94 )
95 def test_magic(src: str, expected: str) -> None:
96     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
97     assert result == expected
98
99
100 @pytest.mark.parametrize(
101     "src",
102     (
103         "%%bash\n2+2",
104         "%%html --isolated\n2+2",
105     ),
106 )
107 def test_non_python_magics(src: str) -> None:
108     with pytest.raises(NothingChanged):
109         format_cell(src, fast=True, mode=JUPYTER_MODE)
110
111
112 def test_set_input() -> None:
113     src = "a = b??"
114     with pytest.raises(NothingChanged):
115         format_cell(src, fast=True, mode=JUPYTER_MODE)
116
117
118 def test_input_already_contains_transformed_magic() -> None:
119     src = '%time foo()\nget_ipython().run_cell_magic("time", "", "foo()\\n")'
120     with pytest.raises(NothingChanged):
121         format_cell(src, fast=True, mode=JUPYTER_MODE)
122
123
124 def test_magic_noop() -> None:
125     src = "ls = !ls"
126     with pytest.raises(NothingChanged):
127         format_cell(src, fast=True, mode=JUPYTER_MODE)
128
129
130 def test_cell_magic_with_magic() -> None:
131     src = "%%t -n1\nls =!ls"
132     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
133     expected = "%%t -n1\nls = !ls"
134     assert result == expected
135
136
137 def test_cell_magic_nested() -> None:
138     src = "%%time\n%%time\n2+2"
139     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
140     expected = "%%time\n%%time\n2 + 2"
141     assert result == expected
142
143
144 def test_cell_magic_with_magic_noop() -> None:
145     src = "%%t -n1\nls = !ls"
146     with pytest.raises(NothingChanged):
147         format_cell(src, fast=True, mode=JUPYTER_MODE)
148
149
150 def test_automagic() -> None:
151     src = "pip install black"
152     with pytest.raises(NothingChanged):
153         format_cell(src, fast=True, mode=JUPYTER_MODE)
154
155
156 def test_multiline_magic() -> None:
157     src = "%time 1 + \\\n2"
158     with pytest.raises(NothingChanged):
159         format_cell(src, fast=True, mode=JUPYTER_MODE)
160
161
162 def test_multiline_no_magic() -> None:
163     src = "1 + \\\n2"
164     result = format_cell(src, fast=True, mode=JUPYTER_MODE)
165     expected = "1 + 2"
166     assert result == expected
167
168
169 def test_cell_magic_with_invalid_body() -> None:
170     src = "%%time\nif True"
171     with pytest.raises(NothingChanged):
172         format_cell(src, fast=True, mode=JUPYTER_MODE)
173
174
175 def test_empty_cell() -> None:
176     src = ""
177     with pytest.raises(NothingChanged):
178         format_cell(src, fast=True, mode=JUPYTER_MODE)
179
180
181 def test_entire_notebook_empty_metadata() -> None:
182     with open(DATA_DIR / "notebook_empty_metadata.ipynb", "rb") as fd:
183         content_bytes = fd.read()
184     content = content_bytes.decode()
185     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
186     expected = (
187         "{\n"
188         ' "cells": [\n'
189         "  {\n"
190         '   "cell_type": "code",\n'
191         '   "execution_count": null,\n'
192         '   "metadata": {\n'
193         '    "tags": []\n'
194         "   },\n"
195         '   "outputs": [],\n'
196         '   "source": [\n'
197         '    "%%time\\n",\n'
198         '    "\\n",\n'
199         '    "print(\\"foo\\")"\n'
200         "   ]\n"
201         "  },\n"
202         "  {\n"
203         '   "cell_type": "code",\n'
204         '   "execution_count": null,\n'
205         '   "metadata": {},\n'
206         '   "outputs": [],\n'
207         '   "source": []\n'
208         "  }\n"
209         " ],\n"
210         ' "metadata": {},\n'
211         ' "nbformat": 4,\n'
212         ' "nbformat_minor": 4\n'
213         "}\n"
214     )
215     assert result == expected
216
217
218 def test_entire_notebook_trailing_newline() -> None:
219     with open(DATA_DIR / "notebook_trailing_newline.ipynb", "rb") as fd:
220         content_bytes = fd.read()
221     content = content_bytes.decode()
222     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
223     expected = (
224         "{\n"
225         ' "cells": [\n'
226         "  {\n"
227         '   "cell_type": "code",\n'
228         '   "execution_count": null,\n'
229         '   "metadata": {\n'
230         '    "tags": []\n'
231         "   },\n"
232         '   "outputs": [],\n'
233         '   "source": [\n'
234         '    "%%time\\n",\n'
235         '    "\\n",\n'
236         '    "print(\\"foo\\")"\n'
237         "   ]\n"
238         "  },\n"
239         "  {\n"
240         '   "cell_type": "code",\n'
241         '   "execution_count": null,\n'
242         '   "metadata": {},\n'
243         '   "outputs": [],\n'
244         '   "source": []\n'
245         "  }\n"
246         " ],\n"
247         ' "metadata": {\n'
248         '  "interpreter": {\n'
249         '   "hash": "e758f3098b5b55f4d87fe30bbdc1367f20f246b483f96267ee70e6c40cb185d8"\n'  # noqa:B950
250         "  },\n"
251         '  "kernelspec": {\n'
252         '   "display_name": "Python 3.8.10 64-bit (\'black\': venv)",\n'
253         '   "name": "python3"\n'
254         "  },\n"
255         '  "language_info": {\n'
256         '   "name": "python",\n'
257         '   "version": ""\n'
258         "  }\n"
259         " },\n"
260         ' "nbformat": 4,\n'
261         ' "nbformat_minor": 4\n'
262         "}\n"
263     )
264     assert result == expected
265
266
267 def test_entire_notebook_no_trailing_newline() -> None:
268     with open(DATA_DIR / "notebook_no_trailing_newline.ipynb", "rb") as fd:
269         content_bytes = fd.read()
270     content = content_bytes.decode()
271     result = format_file_contents(content, fast=True, mode=JUPYTER_MODE)
272     expected = (
273         "{\n"
274         ' "cells": [\n'
275         "  {\n"
276         '   "cell_type": "code",\n'
277         '   "execution_count": null,\n'
278         '   "metadata": {\n'
279         '    "tags": []\n'
280         "   },\n"
281         '   "outputs": [],\n'
282         '   "source": [\n'
283         '    "%%time\\n",\n'
284         '    "\\n",\n'
285         '    "print(\\"foo\\")"\n'
286         "   ]\n"
287         "  },\n"
288         "  {\n"
289         '   "cell_type": "code",\n'
290         '   "execution_count": null,\n'
291         '   "metadata": {},\n'
292         '   "outputs": [],\n'
293         '   "source": []\n'
294         "  }\n"
295         " ],\n"
296         ' "metadata": {\n'
297         '  "interpreter": {\n'
298         '   "hash": "e758f3098b5b55f4d87fe30bbdc1367f20f246b483f96267ee70e6c40cb185d8"\n'  # noqa: B950
299         "  },\n"
300         '  "kernelspec": {\n'
301         '   "display_name": "Python 3.8.10 64-bit (\'black\': venv)",\n'
302         '   "name": "python3"\n'
303         "  },\n"
304         '  "language_info": {\n'
305         '   "name": "python",\n'
306         '   "version": ""\n'
307         "  }\n"
308         " },\n"
309         ' "nbformat": 4,\n'
310         ' "nbformat_minor": 4\n'
311         "}"
312     )
313     assert result == expected
314
315
316 def test_entire_notebook_without_changes() -> None:
317     with open(DATA_DIR / "notebook_without_changes.ipynb", "rb") as fd:
318         content_bytes = fd.read()
319     content = content_bytes.decode()
320     with pytest.raises(NothingChanged):
321         format_file_contents(content, fast=True, mode=JUPYTER_MODE)
322
323
324 def test_non_python_notebook() -> None:
325     with open(DATA_DIR / "non_python_notebook.ipynb", "rb") as fd:
326         content_bytes = fd.read()
327     content = content_bytes.decode()
328     with pytest.raises(NothingChanged):
329         format_file_contents(content, fast=True, mode=JUPYTER_MODE)
330
331
332 def test_empty_string() -> None:
333     with pytest.raises(NothingChanged):
334         format_file_contents("", fast=True, mode=JUPYTER_MODE)
335
336
337 def test_unparseable_notebook() -> None:
338     path = DATA_DIR / "notebook_which_cant_be_parsed.ipynb"
339     msg = rf"File '{re.escape(str(path))}' cannot be parsed as valid Jupyter notebook\."
340     with pytest.raises(ValueError, match=msg):
341         format_file_in_place(path, fast=True, mode=JUPYTER_MODE)
342
343
344 def test_ipynb_diff_with_change() -> None:
345     result = runner.invoke(
346         main,
347         [
348             str(DATA_DIR / "notebook_trailing_newline.ipynb"),
349             "--diff",
350         ],
351     )
352     expected = "@@ -1,3 +1,3 @@\n %%time\n \n-print('foo')\n" '+print("foo")\n'
353     assert expected in result.output
354
355
356 def test_ipynb_diff_with_no_change() -> None:
357     result = runner.invoke(
358         main,
359         [
360             str(DATA_DIR / "notebook_without_changes.ipynb"),
361             "--diff",
362         ],
363     )
364     expected = "1 file would be left unchanged."
365     assert expected in result.output
366
367
368 def test_cache_isnt_written_if_no_jupyter_deps_single(
369     monkeypatch: MonkeyPatch, tmpdir: local
370 ) -> None:
371     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
372     jupyter_dependencies_are_installed.cache_clear()
373     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
374     tmp_nb = tmpdir / "notebook.ipynb"
375     with open(nb) as src, open(tmp_nb, "w") as dst:
376         dst.write(src.read())
377     monkeypatch.setattr(
378         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: False
379     )
380     result = runner.invoke(main, [str(tmpdir / "notebook.ipynb")])
381     assert "No Python files are present to be formatted. Nothing to do" in result.output
382     jupyter_dependencies_are_installed.cache_clear()
383     monkeypatch.setattr(
384         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: True
385     )
386     result = runner.invoke(main, [str(tmpdir / "notebook.ipynb")])
387     assert "reformatted" in result.output
388
389
390 def test_cache_isnt_written_if_no_jupyter_deps_dir(
391     monkeypatch: MonkeyPatch, tmpdir: local
392 ) -> None:
393     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
394     jupyter_dependencies_are_installed.cache_clear()
395     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
396     tmp_nb = tmpdir / "notebook.ipynb"
397     with open(nb) as src, open(tmp_nb, "w") as dst:
398         dst.write(src.read())
399     monkeypatch.setattr(
400         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: False
401     )
402     result = runner.invoke(main, [str(tmpdir)])
403     assert "No Python files are present to be formatted. Nothing to do" in result.output
404     jupyter_dependencies_are_installed.cache_clear()
405     monkeypatch.setattr(
406         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: True
407     )
408     result = runner.invoke(main, [str(tmpdir)])
409     assert "reformatted" in result.output
410
411
412 def test_ipynb_flag(tmpdir: local) -> None:
413     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
414     tmp_nb = tmpdir / "notebook.a_file_extension_which_is_definitely_not_ipynb"
415     with open(nb) as src, open(tmp_nb, "w") as dst:
416         dst.write(src.read())
417     result = runner.invoke(
418         main,
419         [
420             str(tmp_nb),
421             "--diff",
422             "--ipynb",
423         ],
424     )
425     expected = "@@ -1,3 +1,3 @@\n %%time\n \n-print('foo')\n" '+print("foo")\n'
426     assert expected in result.output
427
428
429 def test_ipynb_and_pyi_flags() -> None:
430     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
431     result = runner.invoke(
432         main,
433         [
434             str(nb),
435             "--pyi",
436             "--ipynb",
437             "--diff",
438         ],
439     )
440     assert isinstance(result.exception, SystemExit)
441     expected = "Cannot pass both `pyi` and `ipynb` flags!\n"
442     assert result.output == expected
443
444
445 def test_unable_to_replace_magics(monkeypatch: MonkeyPatch) -> None:
446     src = "%%time\na = 'foo'"
447     monkeypatch.setattr("black.handle_ipynb_magics.TOKEN_HEX", lambda _: "foo")
448     with pytest.raises(
449         AssertionError, match="Black was not able to replace IPython magic"
450     ):
451         format_cell(src, fast=True, mode=JUPYTER_MODE)