Update README with stdin information

[etc/vim.git] / tests / test_black.py

diff --git a/tests/test_black.py b/tests/test_black.py
index 223c907217059b50c3a822c54f2649adf7d85118..225ece6f474e5f66ff7efdc17da8e9f906e516f0 100644 (file)
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -1,7 +1,9 @@
 #!/usr/bin/env python3
 from functools import partial
+from io import StringIO
 from pathlib import Path
-from typing import List, Tuple
+import sys
+from typing import Any, List, Tuple
 import unittest
 from unittest.mock import patch
 
@@ -10,7 +12,7 @@ from click import unstyle
 import black
 
 ll = 88
-ff = partial(black.format_file, line_length=ll, fast=True)
+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
@@ -46,6 +48,7 @@ class BlackTestCase(unittest.TestCase):
 
     def assertFormatEqual(self, expected: str, actual: str) -> None:
         if actual != expected:
+            bdv: black.DebugVisitor[Any]
             black.out('Expected tree:', fg='green')
             try:
                 exp_node = black.lib2to3_parse(expected)
@@ -69,8 +72,7 @@ class BlackTestCase(unittest.TestCase):
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
-        with self.assertRaises(black.NothingChanged):
-            ff(THIS_FILE)
+        self.assertFalse(ff(THIS_FILE))
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_black(self) -> None:
@@ -79,8 +81,22 @@ class BlackTestCase(unittest.TestCase):
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
-        with self.assertRaises(black.NothingChanged):
-            ff(THIS_FILE)
+        self.assertFalse(ff(THIS_DIR / '..' / 'black.py'))
+
+    def test_piping(self) -> None:
+        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)
+            sys.stdout.seek(0)
+            actual = sys.stdout.read()
+        finally:
+            sys.stdin, sys.stdout = hold_stdin, hold_stdout
+        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_setup(self) -> None:
@@ -89,8 +105,7 @@ class BlackTestCase(unittest.TestCase):
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
-        with self.assertRaises(black.NothingChanged):
-            ff(THIS_FILE)
+        self.assertFalse(ff(THIS_DIR / '..' / 'setup.py'))
 
     @patch("black.dump_to_file", dump_to_stderr)
     def test_function(self) -> None:
@@ -108,6 +123,14 @@ class BlackTestCase(unittest.TestCase):
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
 
+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_fstring(self) -> None:
+        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_comments(self) -> None:
         source, expected = read_data('comments')
@@ -153,10 +176,10 @@ class BlackTestCase(unittest.TestCase):
         out_lines = []
         err_lines = []
 
-        def out(msg: str, **kwargs):
+        def out(msg: str, **kwargs: Any) -> None:
             out_lines.append(msg)
 
-        def err(msg: str, **kwargs):
+        def err(msg: str, **kwargs: Any) -> None:
             err_lines.append(msg)
 
         with patch("black.out", out), patch("black.err", err):
@@ -215,6 +238,24 @@ class BlackTestCase(unittest.TestCase):
             )
             self.assertEqual(report.return_code, 123)
 
+    def test_is_python36(self) -> None:
+        node = black.lib2to3_parse("def f(*, arg): ...\n")
+        self.assertFalse(black.is_python36(node))
+        node = black.lib2to3_parse("def f(*, arg,): ...\n")
+        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')
+        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')
+        node = black.lib2to3_parse(source)
+        self.assertFalse(black.is_python36(node))
+        node = black.lib2to3_parse(expected)
+        self.assertFalse(black.is_python36(node))
+
 
 if __name__ == '__main__':
     unittest.main()