]> git.madduck.net Git - etc/vim.git/blobdiff - tests/test_black.py

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

Advertise Windows support in Vim plugin
[etc/vim.git] / tests / test_black.py
index 62b4b1a7dad5cf30a00e45176a0d6565a4d736f3..f71f9b3f910eebdb09c7629b6853385c27691ce2 100644 (file)
@@ -17,23 +17,25 @@ ff = partial(black.format_file_in_place, line_length=ll, fast=True)
 fs = partial(black.format_str, line_length=ll)
 THIS_FILE = Path(__file__)
 THIS_DIR = THIS_FILE.parent
+EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
 
 
 def dump_to_stderr(*output: str) -> str:
-    return '\n' + '\n'.join(output) + '\n'
+    return "\n" + "\n".join(output) + "\n"
 
 
 def read_data(name: str) -> Tuple[str, str]:
     """read_data('test_name') -> 'input', 'output'"""
-    if not name.endswith(('.py', '.out')):
-        name += '.py'
+    if not name.endswith((".py", ".out", ".diff")):
+        name += ".py"
     _input: List[str] = []
     _output: List[str] = []
-    with open(THIS_DIR / name, 'r', encoding='utf8') as test:
+    with open(THIS_DIR / name, "r", encoding="utf8") as test:
         lines = test.readlines()
     result = _input
     for line in lines:
-        if line.rstrip() == '# output':
+        line = line.replace(EMPTY_LINE, "")
+        if line.rstrip() == "# output":
             result = _output
             continue
 
@@ -41,23 +43,23 @@ def read_data(name: str) -> Tuple[str, str]:
     if _input and not _output:
         # If there's no output marker, treat the entire file as already pre-formatted.
         _output = _input[:]
-    return ''.join(_input).strip() + '\n', ''.join(_output).strip() + '\n'
+    return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"
 
 
 class BlackTestCase(unittest.TestCase):
     maxDiff = None
 
     def assertFormatEqual(self, expected: str, actual: str) -> None:
-        if actual != expected and not os.environ.get('SKIP_AST_PRINT'):
+        if actual != expected and not os.environ.get("SKIP_AST_PRINT"):
             bdv: black.DebugVisitor[Any]
-            black.out('Expected tree:', fg='green')
+            black.out("Expected tree:", fg="green")
             try:
                 exp_node = black.lib2to3_parse(expected)
                 bdv = black.DebugVisitor()
                 list(bdv.visit(exp_node))
             except Exception as ve:
                 black.err(str(ve))
-            black.out('Actual tree:', fg='red')
+            black.out("Actual tree:", fg="red")
             try:
                 exp_node = black.lib2to3_parse(actual)
                 bdv = black.DebugVisitor()
@@ -68,7 +70,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_self(self) -> None:
-        source, expected = read_data('test_black')
+        source, expected = read_data("test_black")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -77,20 +79,22 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_black(self) -> None:
-        source, expected = read_data('../black')
+        source, expected = read_data("../black")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
-        self.assertFalse(ff(THIS_DIR / '..' / 'black.py'))
+        self.assertFalse(ff(THIS_DIR / ".." / "black.py"))
 
     def test_piping(self) -> None:
-        source, expected = read_data('../black')
+        source, expected = read_data("../black")
         hold_stdin, hold_stdout = sys.stdin, sys.stdout
         try:
             sys.stdin, sys.stdout = StringIO(source), StringIO()
-            sys.stdin.name = '<stdin>'
-            black.format_stdin_to_stdout(line_length=ll, fast=True, write_back=True)
+            sys.stdin.name = "<stdin>"
+            black.format_stdin_to_stdout(
+                line_length=ll, fast=True, write_back=black.WriteBack.YES
+            )
             sys.stdout.seek(0)
             actual = sys.stdout.read()
         finally:
@@ -99,18 +103,35 @@ class BlackTestCase(unittest.TestCase):
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
 
+    def test_piping_diff(self) -> None:
+        source, _ = read_data("expression.py")
+        expected, _ = read_data("expression.diff")
+        hold_stdin, hold_stdout = sys.stdin, sys.stdout
+        try:
+            sys.stdin, sys.stdout = StringIO(source), StringIO()
+            sys.stdin.name = "<stdin>"
+            black.format_stdin_to_stdout(
+                line_length=ll, fast=True, write_back=black.WriteBack.DIFF
+            )
+            sys.stdout.seek(0)
+            actual = sys.stdout.read()
+        finally:
+            sys.stdin, sys.stdout = hold_stdin, hold_stdout
+        actual = actual.rstrip() + "\n"  # the diff output has a trailing space
+        self.assertEqual(expected, actual)
+
     @patch("black.dump_to_file", dump_to_stderr)
     def test_setup(self) -> None:
-        source, expected = read_data('../setup')
+        source, expected = read_data("../setup")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
-        self.assertFalse(ff(THIS_DIR / '..' / 'setup.py'))
+        self.assertFalse(ff(THIS_DIR / ".." / "setup.py"))
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_function(self) -> None:
-        source, expected = read_data('function')
+        source, expected = read_data("function")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -118,15 +139,61 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_expression(self) -> None:
-        source, expected = read_data('expression')
+        source, expected = read_data("expression")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
 
+    def test_expression_ff(self) -> None:
+        source, expected = read_data("expression")
+        tmp_file = Path(black.dump_to_file(source))
+        try:
+            self.assertTrue(ff(tmp_file, write_back=black.WriteBack.YES))
+            with open(tmp_file) as f:
+                actual = f.read()
+        finally:
+            os.unlink(tmp_file)
+        self.assertFormatEqual(expected, actual)
+        with patch("black.dump_to_file", dump_to_stderr):
+            black.assert_equivalent(source, actual)
+            black.assert_stable(source, actual, line_length=ll)
+
+    def test_expression_diff(self) -> None:
+        source, _ = read_data("expression.py")
+        expected, _ = read_data("expression.diff")
+        tmp_file = Path(black.dump_to_file(source))
+        hold_stdout = sys.stdout
+        try:
+            sys.stdout = StringIO()
+            self.assertTrue(ff(tmp_file, write_back=black.WriteBack.DIFF))
+            sys.stdout.seek(0)
+            actual = sys.stdout.read()
+            actual = actual.replace(tmp_file.name, "<stdin>")
+        finally:
+            sys.stdout = hold_stdout
+            os.unlink(tmp_file)
+        actual = actual.rstrip() + "\n"  # the diff output has a trailing space
+        if expected != actual:
+            dump = black.dump_to_file(actual)
+            msg = (
+                f"Expected diff isn't equal to the actual. If you made changes "
+                f"to expression.py and this is an anticipated difference, "
+                f"overwrite tests/expression.diff with {dump}."
+            )
+            self.assertEqual(expected, actual, msg)
+
     @patch("black.dump_to_file", dump_to_stderr)
     def test_fstring(self) -> None:
-        source, expected = read_data('fstring')
+        source, expected = read_data("fstring")
+        actual = fs(source)
+        self.assertFormatEqual(expected, actual)
+        black.assert_equivalent(source, actual)
+        black.assert_stable(source, actual, line_length=ll)
+
+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_string_quotes(self) -> None:
+        source, expected = read_data("string_quotes")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -134,7 +201,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_comments(self) -> None:
-        source, expected = read_data('comments')
+        source, expected = read_data("comments")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -142,7 +209,23 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_comments2(self) -> None:
-        source, expected = read_data('comments2')
+        source, expected = read_data("comments2")
+        actual = fs(source)
+        self.assertFormatEqual(expected, actual)
+        black.assert_equivalent(source, actual)
+        black.assert_stable(source, actual, line_length=ll)
+
+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_comments3(self) -> None:
+        source, expected = read_data("comments3")
+        actual = fs(source)
+        self.assertFormatEqual(expected, actual)
+        black.assert_equivalent(source, actual)
+        black.assert_stable(source, actual, line_length=ll)
+
+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_comments4(self) -> None:
+        source, expected = read_data("comments4")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -150,7 +233,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_cantfit(self) -> None:
-        source, expected = read_data('cantfit')
+        source, expected = read_data("cantfit")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -158,7 +241,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_import_spacing(self) -> None:
-        source, expected = read_data('import_spacing')
+        source, expected = read_data("import_spacing")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -166,7 +249,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_composition(self) -> None:
-        source, expected = read_data('composition')
+        source, expected = read_data("composition")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -174,7 +257,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_empty_lines(self) -> None:
-        source, expected = read_data('empty_lines')
+        source, expected = read_data("empty_lines")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -182,7 +265,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_python2(self) -> None:
-        source, expected = read_data('python2')
+        source, expected = read_data("python2")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         # black.assert_equivalent(source, actual)
@@ -190,7 +273,7 @@ class BlackTestCase(unittest.TestCase):
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_fmtonoff(self) -> None:
-        source, expected = read_data('fmtonoff')
+        source, expected = read_data("fmtonoff")
         actual = fs(source)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
@@ -208,68 +291,68 @@ class BlackTestCase(unittest.TestCase):
             err_lines.append(msg)
 
         with patch("black.out", out), patch("black.err", err):
-            report.done(Path('f1'), changed=False)
+            report.done(Path("f1"), changed=False)
             self.assertEqual(len(out_lines), 1)
             self.assertEqual(len(err_lines), 0)
-            self.assertEqual(out_lines[-1], 'f1 already well formatted, good job.')
-            self.assertEqual(unstyle(str(report)), '1 file left unchanged.')
+            self.assertEqual(out_lines[-1], "f1 already well formatted, good job.")
+            self.assertEqual(unstyle(str(report)), "1 file left unchanged.")
             self.assertEqual(report.return_code, 0)
-            report.done(Path('f2'), changed=True)
+            report.done(Path("f2"), changed=True)
             self.assertEqual(len(out_lines), 2)
             self.assertEqual(len(err_lines), 0)
-            self.assertEqual(out_lines[-1], 'reformatted f2')
+            self.assertEqual(out_lines[-1], "reformatted f2")
             self.assertEqual(
-                unstyle(str(report)), '1 file reformatted, 1 file left unchanged.'
+                unstyle(str(report)), "1 file reformatted, 1 file left unchanged."
             )
             self.assertEqual(report.return_code, 0)
             report.check = True
             self.assertEqual(report.return_code, 1)
             report.check = False
-            report.failed(Path('e1'), 'boom')
+            report.failed(Path("e1"), "boom")
             self.assertEqual(len(out_lines), 2)
             self.assertEqual(len(err_lines), 1)
-            self.assertEqual(err_lines[-1], 'error: cannot format e1: boom')
+            self.assertEqual(err_lines[-1], "error: cannot format e1: boom")
             self.assertEqual(
                 unstyle(str(report)),
-                '1 file reformatted, 1 file left unchanged, '
-                '1 file failed to reformat.',
+                "1 file reformatted, 1 file left unchanged, "
+                "1 file failed to reformat.",
             )
             self.assertEqual(report.return_code, 123)
-            report.done(Path('f3'), changed=True)
+            report.done(Path("f3"), changed=True)
             self.assertEqual(len(out_lines), 3)
             self.assertEqual(len(err_lines), 1)
-            self.assertEqual(out_lines[-1], 'reformatted f3')
+            self.assertEqual(out_lines[-1], "reformatted f3")
             self.assertEqual(
                 unstyle(str(report)),
-                '2 files reformatted, 1 file left unchanged, '
-                '1 file failed to reformat.',
+                "2 files reformatted, 1 file left unchanged, "
+                "1 file failed to reformat.",
             )
             self.assertEqual(report.return_code, 123)
-            report.failed(Path('e2'), 'boom')
+            report.failed(Path("e2"), "boom")
             self.assertEqual(len(out_lines), 3)
             self.assertEqual(len(err_lines), 2)
-            self.assertEqual(err_lines[-1], 'error: cannot format e2: boom')
+            self.assertEqual(err_lines[-1], "error: cannot format e2: boom")
             self.assertEqual(
                 unstyle(str(report)),
-                '2 files reformatted, 1 file left unchanged, '
-                '2 files failed to reformat.',
+                "2 files reformatted, 1 file left unchanged, "
+                "2 files failed to reformat.",
             )
             self.assertEqual(report.return_code, 123)
-            report.done(Path('f4'), changed=False)
+            report.done(Path("f4"), changed=False)
             self.assertEqual(len(out_lines), 4)
             self.assertEqual(len(err_lines), 2)
-            self.assertEqual(out_lines[-1], 'f4 already well formatted, good job.')
+            self.assertEqual(out_lines[-1], "f4 already well formatted, good job.")
             self.assertEqual(
                 unstyle(str(report)),
-                '2 files reformatted, 2 files left unchanged, '
-                '2 files failed to reformat.',
+                "2 files reformatted, 2 files left unchanged, "
+                "2 files failed to reformat.",
             )
             self.assertEqual(report.return_code, 123)
             report.check = True
             self.assertEqual(
                 unstyle(str(report)),
-                '2 files would be reformatted, 2 files would be left unchanged, '
-                '2 files would fail to reformat.',
+                "2 files would be reformatted, 2 files would be left unchanged, "
+                "2 files would fail to reformat.",
             )
 
     def test_is_python36(self) -> None:
@@ -279,20 +362,20 @@ class BlackTestCase(unittest.TestCase):
         self.assertTrue(black.is_python36(node))
         node = black.lib2to3_parse("def f(*, arg): f'string'\n")
         self.assertTrue(black.is_python36(node))
-        source, expected = read_data('function')
+        source, expected = read_data("function")
         node = black.lib2to3_parse(source)
         self.assertTrue(black.is_python36(node))
         node = black.lib2to3_parse(expected)
         self.assertTrue(black.is_python36(node))
-        source, expected = read_data('expression')
+        source, expected = read_data("expression")
         node = black.lib2to3_parse(source)
         self.assertFalse(black.is_python36(node))
         node = black.lib2to3_parse(expected)
         self.assertFalse(black.is_python36(node))
 
     def test_debug_visitor(self) -> None:
-        source, _ = read_data('debug_visitor.py')
-        expected, _ = read_data('debug_visitor.out')
+        source, _ = read_data("debug_visitor.py")
+        expected, _ = read_data("debug_visitor.out")
         out_lines = []
         err_lines = []
 
@@ -304,8 +387,8 @@ class BlackTestCase(unittest.TestCase):
 
         with patch("black.out", out), patch("black.err", err):
             black.DebugVisitor.show(source)
-        actual = '\n'.join(out_lines) + '\n'
-        log_name = ''
+        actual = "\n".join(out_lines) + "\n"
+        log_name = ""
         if expected != actual:
             log_name = black.dump_to_file(*out_lines)
         self.assertEqual(
@@ -314,6 +397,51 @@ class BlackTestCase(unittest.TestCase):
             f"AST print out is different. Actual version dumped to {log_name}",
         )
 
+    def test_format_file_contents(self) -> None:
+        empty = ""
+        with self.assertRaises(black.NothingChanged):
+            black.format_file_contents(empty, line_length=ll, fast=False)
+        just_nl = "\n"
+        with self.assertRaises(black.NothingChanged):
+            black.format_file_contents(just_nl, line_length=ll, fast=False)
+        same = "l = [1, 2, 3]\n"
+        with self.assertRaises(black.NothingChanged):
+            black.format_file_contents(same, line_length=ll, fast=False)
+        different = "l = [1,2,3]"
+        expected = same
+        actual = black.format_file_contents(different, line_length=ll, fast=False)
+        self.assertEqual(expected, actual)
+        invalid = "return if you can"
+        with self.assertRaises(ValueError) as e:
+            black.format_file_contents(invalid, line_length=ll, fast=False)
+        self.assertEqual(str(e.exception), "Cannot parse: 1:7: return if you can")
+
+    def test_endmarker(self) -> None:
+        n = black.lib2to3_parse("\n")
+        self.assertEqual(n.type, black.syms.file_input)
+        self.assertEqual(len(n.children), 1)
+        self.assertEqual(n.children[0].type, black.token.ENDMARKER)
+
+    @unittest.skipIf(os.environ.get("SKIP_AST_PRINT"), "user set SKIP_AST_PRINT")
+    def test_assertFormatEqual(self) -> None:
+        out_lines = []
+        err_lines = []
+
+        def out(msg: str, **kwargs: Any) -> None:
+            out_lines.append(msg)
+
+        def err(msg: str, **kwargs: Any) -> None:
+            err_lines.append(msg)
+
+        with patch("black.out", out), patch("black.err", err):
+            with self.assertRaises(AssertionError):
+                self.assertFormatEqual("l = [1, 2, 3]", "l = [1, 2, 3,]")
+
+        out_str = "".join(out_lines)
+        self.assertTrue("Expected tree:" in out_str)
+        self.assertTrue("Actual tree:" in out_str)
+        self.assertEqual("".join(err_lines), "")
+
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()