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"""Testing `tabnanny` module. |
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Removed this. This is Github glitch.
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Glossary: |
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* errored : Whitespace related problems present in file. |
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""" |
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from unittest import TestCase, mock |
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from unittest import mock |
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import tabnanny |
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import tokenize |
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import tempfile |
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import textwrap |
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from test.support import (captured_stderr, captured_stdout, script_helper, |
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findfile, unlink) |
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SOURCE_CODES = { |
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"incomplete_expression": ( |
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'fruits = [\n' |
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' "Apple",\n' |
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' "Orange",\n' |
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' "Banana",\n' |
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'\n' |
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'print(fruits)\n' |
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), |
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"wrong_indented": ( |
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'if True:\n' |
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' print("hello")\n' |
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' print("world")\n' |
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'else:\n' |
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' print("else called")\n' |
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), |
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"nannynag_errored": ( |
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'if True:\n' |
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' \tprint("hello")\n' |
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'\tprint("world")\n' |
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'else:\n' |
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' print("else called")\n' |
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), |
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"error_free": ( |
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'if True:\n' |
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' print("hello")\n' |
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' print("world")\n' |
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'else:\n' |
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' print("else called")\n' |
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), |
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"tab_space_errored_1": ( |
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'def my_func():\n' |
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'\t print("hello world")\n' |
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'\t if True:\n' |
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'\t\tprint("If called")' |
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), |
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"tab_space_errored_2": ( |
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'def my_func():\n' |
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'\t\tprint("Hello world")\n' |
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'\t\tif True:\n' |
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'\t print("If called")' |
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) |
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} |
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class TemporaryPyFile: |
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"""Create a temporary python source code file.""" |
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def __init__(self, source_code='', directory=None): |
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self.source_code = source_code |
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self.dir = directory |
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def __enter__(self): |
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with tempfile.NamedTemporaryFile( |
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mode='w', dir=self.dir, suffix=".py", delete=False |
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) as f: |
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f.write(self.source_code) |
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self.file_path = f.name |
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return self.file_path |
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def __exit__(self, exc_type, exc_value, exc_traceback): |
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unlink(self.file_path) |
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class TestFormatWitnesses(TestCase): |
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"""Testing `tabnanny.format_witnesses()`.""" |
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def test_format_witnesses(self): |
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"""Asserting formatter result by giving various input samples.""" |
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tests = [ |
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('Test', 'at tab sizes T, e, s, t'), |
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('', 'at tab size '), |
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('t', 'at tab size t'), |
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(' t ', 'at tab sizes , , t, , '), |
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] |
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for words, expected in tests: |
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with self.subTest(words=words, expected=expected): |
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self.assertEqual(tabnanny.format_witnesses(words), expected) |
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class TestErrPrint(TestCase): |
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"""Testing `tabnanny.errprint()`.""" |
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def test_errprint(self): |
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"""Asserting result of `tabnanny.errprint()` by giving sample inputs.""" |
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tests = [ |
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(['first', 'second'], 'first second\n'), |
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(['first'], 'first\n'), |
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([1, 2, 3], '1 2 3\n'), |
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([], '\n') |
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] |
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for args, expected in tests: |
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with self.subTest(arguments=args, expected=expected): |
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with captured_stderr() as stderr: |
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tabnanny.errprint(*args) |
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self.assertEqual(stderr.getvalue() , expected) |
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class TestNannyNag(TestCase): |
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def test_all_methods(self): |
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"""Asserting behaviour of `tabnanny.NannyNag` exception.""" |
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tests = [ |
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( |
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tabnanny.NannyNag(0, "foo", "bar"), |
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{'lineno': 0, 'msg': 'foo', 'line': 'bar'} |
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), |
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( |
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tabnanny.NannyNag(5, "testmsg", "testline"), |
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{'lineno': 5, 'msg': 'testmsg', 'line': 'testline'} |
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) |
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] |
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for nanny, expected in tests: |
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line_number = nanny.get_lineno() |
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msg = nanny.get_msg() |
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line = nanny.get_line() |
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with self.subTest( |
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line_number=line_number, expected=expected['lineno'] |
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): |
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self.assertEqual(expected['lineno'], line_number) |
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with self.subTest(msg=msg, expected=expected['msg']): |
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self.assertEqual(expected['msg'], msg) |
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with self.subTest(line=line, expected=expected['line']): |
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self.assertEqual(expected['line'], line) |
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class TestCheck(TestCase): |
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"""Testing tabnanny.check().""" |
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def setUp(self): |
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self.addCleanup(setattr, tabnanny, 'verbose', tabnanny.verbose) |
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tabnanny.verbose = 0 # Forcefully deactivating verbose mode. |
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def verify_tabnanny_check(self, dir_or_file, out="", err=""): |
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"""Common verification for tabnanny.check(). |
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Use this method to assert expected values of `stdout` and `stderr` after |
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running tabnanny.check() on given `dir` or `file` path. Because |
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tabnanny.check() captures exceptions and writes to `stdout` and |
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`stderr`, asserting standard outputs is the only way. |
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""" |
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with captured_stdout() as stdout, captured_stderr() as stderr: |
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tabnanny.check(dir_or_file) |
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self.assertEqual(stdout.getvalue(), out) |
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self.assertEqual(stderr.getvalue(), err) |
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def test_correct_file(self): |
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"""A python source code file without any errors.""" |
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with TemporaryPyFile(SOURCE_CODES["error_free"]) as file_path: |
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self.verify_tabnanny_check(file_path) |
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def test_correct_directory_verbose(self): |
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"""Directory containing few error free python source code files. |
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Because order of files returned by `os.lsdir()` is not fixed, verify the |
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existence of each output lines at `stdout` using `in` operator. |
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`verbose` mode of `tabnanny.verbose` asserts `stdout`. |
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""" |
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with tempfile.TemporaryDirectory() as tmp_dir: |
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lines = [f"{tmp_dir!r}: listing directory\n",] |
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file1 = TemporaryPyFile(SOURCE_CODES["error_free"], directory=tmp_dir) |
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file2 = TemporaryPyFile(SOURCE_CODES["error_free"], directory=tmp_dir) |
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with file1 as file1_path, file2 as file2_path: |
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for file_path in (file1_path, file2_path): |
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lines.append(f"{file_path!r}: Clean bill of health.\n") |
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tabnanny.verbose = 1 |
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with captured_stdout() as stdout, captured_stderr() as stderr: |
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tabnanny.check(tmp_dir) |
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stdout = stdout.getvalue() |
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for line in lines: |
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with self.subTest(line=line): |
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self.assertIn(line, stdout) |
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self.assertEqual(stderr.getvalue(), "") |
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def test_correct_directory(self): |
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"""Directory which contains few error free python source code files.""" |
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with tempfile.TemporaryDirectory() as tmp_dir: |
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with TemporaryPyFile(SOURCE_CODES["error_free"], directory=tmp_dir): |
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self.verify_tabnanny_check(tmp_dir) |
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def test_when_wrong_indented(self): |
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"""A python source code file eligible for raising `IndentationError`.""" |
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with TemporaryPyFile(SOURCE_CODES["wrong_indented"]) as file_path: |
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err = ('unindent does not match any outer indentation level' |
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' (<tokenize>, line 3)\n') |
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err = f"{file_path!r}: Indentation Error: {err}" |
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self.verify_tabnanny_check(file_path, err=err) |
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def test_when_tokenize_tokenerror(self): |
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"""A python source code file eligible for raising 'tokenize.TokenError'.""" |
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with TemporaryPyFile(SOURCE_CODES["incomplete_expression"]) as file_path: |
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err = "('EOF in multi-line statement', (7, 0))\n" |
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err = f"{file_path!r}: Token Error: {err}" |
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self.verify_tabnanny_check(file_path, err=err) |
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def test_when_nannynag_error_verbose(self): |
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"""A python source code file eligible for raising `tabnanny.NannyNag`. |
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Tests will assert `stdout` after activating `tabnanny.verbose` mode. |
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""" |
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with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path: |
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out = f"{file_path!r}: *** Line 3: trouble in tab city! ***\n" |
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out += "offending line: '\\tprint(\"world\")\\n'\n" |
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out += "indent not equal e.g. at tab size 1\n" |
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tabnanny.verbose = 1 |
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self.verify_tabnanny_check(file_path, out=out) |
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def test_when_nannynag_error(self): |
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"""A python source code file eligible for raising `tabnanny.NannyNag`.""" |
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with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path: |
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out = f"{file_path} 3 '\\tprint(\"world\")\\n'\n" |
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self.verify_tabnanny_check(file_path, out=out) |
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def test_when_no_file(self): |
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"""A python file which does not exist actually in system.""" |
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path = 'no_file.py' |
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err = f"{path!r}: I/O Error: [Errno 2] No such file or directory: {path!r}\n" |
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self.verify_tabnanny_check(path, err=err) |
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def test_errored_directory(self): |
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"""Directory containing wrongly indented python source code files.""" |
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with tempfile.TemporaryDirectory() as tmp_dir: |
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error_file = TemporaryPyFile( |
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SOURCE_CODES["wrong_indented"], directory=tmp_dir |
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) |
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code_file = TemporaryPyFile( |
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SOURCE_CODES["error_free"], directory=tmp_dir |
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) |
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with error_file as e_file, code_file as c_file: |
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err = ('unindent does not match any outer indentation level' |
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' (<tokenize>, line 3)\n') |
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err = f"{e_file!r}: Indentation Error: {err}" |
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self.verify_tabnanny_check(tmp_dir, err=err) |
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class TestProcessTokens(TestCase): |
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"""Testing `tabnanny.process_tokens()`.""" |
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@mock.patch('tabnanny.NannyNag') |
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def test_with_correct_code(self, MockNannyNag): |
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"""A python source code without any whitespace related problems.""" |
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with TemporaryPyFile(SOURCE_CODES["error_free"]) as file_path: |
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with open(file_path) as f: |
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tabnanny.process_tokens(tokenize.generate_tokens(f.readline)) |
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self.assertFalse(MockNannyNag.called) |
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def test_with_errored_codes_samples(self): |
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"""A python source code with whitespace related sampled problems.""" |
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# "tab_space_errored_1": executes block under type == tokenize.INDENT |
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# at `tabnanny.process_tokens()`. |
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# "tab space_errored_2": executes block under |
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# `check_equal and type not in JUNK` condition at |
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# `tabnanny.process_tokens()`. |
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for key in ["tab_space_errored_1", "tab_space_errored_2"]: |
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Sub tests would be great here.
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with self.subTest(key=key): |
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with TemporaryPyFile(SOURCE_CODES[key]) as file_path: |
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with open(file_path) as f: |
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tokens = tokenize.generate_tokens(f.readline) |
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with self.assertRaises(tabnanny.NannyNag): |
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tabnanny.process_tokens(tokens) |
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class TestCommandLine(TestCase): |
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"""Tests command line interface of `tabnanny`.""" |
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def validate_cmd(self, *args, stdout="", stderr="", partial=False): |
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"""Common function to assert the behaviour of command line interface.""" |
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_, out, err = script_helper.assert_python_ok('-m', 'tabnanny', *args) |
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# Note: The `splitlines()` will solve the problem of CRLF(\r) added |
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# by OS Windows. |
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out = out.decode('ascii') |
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err = err.decode('ascii') |
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if partial: |
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for std, output in ((stdout, out), (stderr, err)): |
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_output = output.splitlines() |
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for _std in std.splitlines(): |
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with self.subTest(std=_std, output=_output): |
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self.assertIn(_std, _output) |
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else: |
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self.assertListEqual(out.splitlines(), stdout.splitlines()) |
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self.assertListEqual(err.splitlines(), stderr.splitlines()) |
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def test_with_errored_file(self): |
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"""Should displays error when errored python file is given.""" |
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with TemporaryPyFile(SOURCE_CODES["wrong_indented"]) as file_path: |
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stderr = f"{file_path!r}: Indentation Error: " |
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stderr += ('unindent does not match any outer indentation level' |
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' (<tokenize>, line 3)') |
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self.validate_cmd(file_path, stderr=stderr) |
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def test_with_error_free_file(self): |
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"""Should not display anything if python file is correctly indented.""" |
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with TemporaryPyFile(SOURCE_CODES["error_free"]) as file_path: |
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self.validate_cmd(file_path) |
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def test_command_usage(self): |
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"""Should display usage on no arguments.""" |
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path = findfile('tabnanny.py') |
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stderr = f"Usage: {path} [-v] file_or_directory ..." |
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self.validate_cmd(stderr=stderr) |
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def test_quiet_flag(self): |
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"""Should display less when quite mode is on.""" |
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with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path: |
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stdout = f"{file_path}\n" |
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self.validate_cmd("-q", file_path, stdout=stdout) |
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def test_verbose_mode(self): |
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"""Should display more error information if verbose mode is on.""" |
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with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path: |
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stdout = textwrap.dedent( |
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"offending line: '\\tprint(\"world\")\\n'" |
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).strip() |
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self.validate_cmd("-v", path, stdout=stdout, partial=True) |
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def test_double_verbose_mode(self): |
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"""Should display detailed error information if double verbose is on.""" |
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with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path: |
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stdout = textwrap.dedent( |
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"offending line: '\\tprint(\"world\")\\n'" |
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).strip() |
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self.validate_cmd("-vv", path, stdout=stdout, partial=True) |