test: add simple test for exclusive flag

1 files changed, 41 insertions, 0 deletions

diff --git a/test/test_exclusive.py b/test/test_exclusive.py
new file mode 100644
index 0000000..c8942d2
--- /dev/null
+++ b/test/test_exclusive.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+#
+# This file is part of pySerial - Cross platform serial port support for Python
+# (C) 2017 Chris Liechti <cliechti@gmx.net>
+#
+# SPDX-License-Identifier:    BSD-3-Clause
+"""\
+Tests for exclusive access feature.
+"""
+
+import os
+import unittest
+import sys
+import serial
+
+# on which port should the tests be performed:
+PORT = 'loop://'
+
+class Test_exclusive(unittest.TestCase):
+    """Test serial port locking"""
+
+    def setUp(self):
+        if not isinstance(serial.serial_for_url(PORT), serial.Serial):
+            raise unittest.SkipTest("exclusive test only compatible with real serial port")
+
+    @unittest.skipIf(os.name != 'posix', "exclusive setting not supported on platform")
+    def test_exclusive(self):
+        """test if port can be opened twice"""
+        a = serial.Serial(PORT, exclusive=True)
+        with self.assertRaises(serial.SerialException):
+            b = serial.Serial(PORT, exclusive=True)
+
+
+if __name__ == '__main__':
+    sys.stdout.write(__doc__)
+    if len(sys.argv) > 1:
+        PORT = sys.argv[1]
+    sys.stdout.write("Testing port: {!r}\n".format(PORT))
+    sys.argv[1:] = ['-v']
+    # When this module is executed from the command-line, it runs all its tests
+    unittest.main()