1 files changed, 87 insertions, 0 deletions
diff --git a/Lib/test/test_winconsoleio.py b/Lib/test/test_winconsoleio.py
new file mode 100644
index 00000000000..ec26f068fcb
--- /dev/null
+++ b/Lib/test/test_winconsoleio.py
@@ -0,0 +1,87 @@
+'''Tests for WindowsConsoleIO
+
+Unfortunately, most testing requires interactive use, since we have no
+API to read back from a real console, and this class is only for use
+with real consoles.
+
+Instead, we validate that basic functionality such as opening, closing
+and in particular fileno() work, but are forced to leave real testing
+to real people with real keyborads.
+'''
+
+import io
+import unittest
+import sys
+
+if sys.platform != 'win32':
+    raise unittest.SkipTest("test only relevant on win32")
+
+ConIO = io._WindowsConsoleIO
+
+class WindowsConsoleIOTests(unittest.TestCase):
+    def test_abc(self):
+        self.assertTrue(issubclass(ConIO, io.RawIOBase))
+        self.assertFalse(issubclass(ConIO, io.BufferedIOBase))
+        self.assertFalse(issubclass(ConIO, io.TextIOBase))
+
+    def test_open_fd(self):
+        try:
+            f = ConIO(0)
+        except ValueError:
+            # cannot open console because it's not a real console
+            pass
+        else:
+            self.assertTrue(f.readable())
+            self.assertFalse(f.writable())
+            self.assertEqual(0, f.fileno())
+            f.close()   # multiple close should not crash
+            f.close()
+
+        try:
+            f = ConIO(1, 'w')
+        except ValueError:
+            # cannot open console because it's not a real console
+            pass
+        else:
+            self.assertFalse(f.readable())
+            self.assertTrue(f.writable())
+            self.assertEqual(1, f.fileno())
+            f.close()
+            f.close()
+
+        try:
+            f = ConIO(2, 'w')
+        except ValueError:
+            # cannot open console because it's not a real console
+            pass
+        else:
+            self.assertFalse(f.readable())
+            self.assertTrue(f.writable())
+            self.assertEqual(2, f.fileno())
+            f.close()
+            f.close()
+
+    def test_open_name(self):
+        f = ConIO("CON")
+        self.assertTrue(f.readable())
+        self.assertFalse(f.writable())
+        self.assertIsNotNone(f.fileno())
+        f.close()   # multiple close should not crash
+        f.close()
+
+        f = ConIO('CONIN$')
+        self.assertTrue(f.readable())
+        self.assertFalse(f.writable())
+        self.assertIsNotNone(f.fileno())
+        f.close()
+        f.close()
+
+        f = ConIO('CONOUT$', 'w')
+        self.assertFalse(f.readable())
+        self.assertTrue(f.writable())
+        self.assertIsNotNone(f.fileno())
+        f.close()
+        f.close()
+
+if __name__ == "__main__":
+    unittest.main()