tests: Fix SMB Py binding .unlink() test case assertion

The current assertion would never detect if the unlink API is broken.
The chkpath() API is only useful for checking if directories exist, so
it will always return False for a regular file (regardless of whether
the file actually exists or not).

Rework the test case so we assert that the file exists by trying to read
its contents (which will throw an error if the file doesn't exist).

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13676

Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/python/samba/tests/smb.py b/python/samba/tests/smb.py
index 6f33ff105fc..e4366ce7b52 100644
--- a/python/samba/tests/smb.py
+++ b/python/samba/tests/smb.py
@@ -20,6 +20,8 @@ import os
 import random
 import sys
 from samba import smb
+from samba import NTSTATUSError
+from samba.ntstatus import NT_STATUS_OBJECT_NAME_NOT_FOUND
 
 PY3 = sys.version_info[0] == 3
 addom = 'addom.samba.example.com/'
@@ -57,13 +59,30 @@ class SMBTests(samba.tests.TestCase):
         self.assertIn('Policies', ls,
                       msg='"Policies" directory not found in sysvol')
 
+    def file_exists(self, filepath):
+        """Returns whether a regular file exists (by trying to open it)"""
+        try:
+            self.conn.loadfile(filepath)
+            exists = True;
+        except NTSTATUSError as err:
+            if err.args[0] == NT_STATUS_OBJECT_NAME_NOT_FOUND:
+                exists = False
+            else:
+                raise err
+        return exists
+
     def test_unlink(self):
         """
         The smb.unlink API should delete file
         """
+        # create the test file
+        self.assertFalse(self.file_exists(test_file))
         self.conn.savefile(test_file, binary_contents)
+        self.assertTrue(self.file_exists(test_file))
+
+        # delete it and check that it's gone
         self.conn.unlink(test_file)
-        self.assertFalse(self.conn.chkpath(test_file))
+        self.assertFalse(self.file_exists(test_file))
 
     def test_chkpath(self):
         """Tests .chkpath determines whether or not a directory exists"""