change test to use a mock, update changelog & authors

AUTHORS

@@ -133,6 +133,7 @@ Contributors:
     * Hollis Wu (holi0317)
     * Antonio Aguilar (crazybolillo)
     * Andrew M. MacFie (amacfie)
+    * saucoide
 
 Creator:
 --------

changelog.rst

@@ -8,6 +8,8 @@ Features:
   displaying of all Postgres error fields received.
 * Show Postgres notifications.
 * Support sqlparse 0.5.x
+* Add `--log-file [filename]` cli argument and `\log-file [filename]` special commands to
+  log to an external file in addition to the normal output
 
 Bug fixes:
 ----------

tests/test_main.py

@@ -352,10 +352,12 @@ def test_logfile_works(executor):
 @dbtest
 def test_logfile_unwriteable_file(executor):
     cli = PGCli(pgexecute=executor)
-    statement = r"\log-file /etc/forbidden.log"
-    result = run(executor, statement, pgspecial=cli.pgspecial)
+    statement = r"\log-file forbidden.log"
+    with mock.patch("builtins.open") as mock_open:
+        mock_open.side_effect = PermissionError("[Errno 13] Permission denied: 'forbidden.log'")
+        result = run(executor, statement, pgspecial=cli.pgspecial)
     assert result == [
-        "[Errno 13] Permission denied: '/etc/forbidden.log'\nLogfile capture disabled"
+        "[Errno 13] Permission denied: 'forbidden.log'\nLogfile capture disabled"
     ]