test: Expect AssertionError for IMAPI2 custom event interface.

Add `Test_IMAPI2FS` to `test_eventinterface.py` to verify that `GetEvents`
raises an `AssertionError` when used with the `MsftFileSystemImage` object.

The default event interface `DFileSystemImageEvents` is a custom
`TKIND_INTERFACE` that inherits from `IDispatch`, but is neither a dual nor
pure dispatch interface. Its v-table methods, as generated from type info, lack
the `dispid` attributes that `GetEvents` requires. This test confirms the
expected failure.

Author: junkmd

comtypes/test/test_eventinterface.py

@@ -1,8 +1,10 @@
 import gc
+import tempfile
 import time
 import unittest as ut
 from ctypes import HRESULT, byref
 from ctypes.wintypes import MSG
+from pathlib import Path
 
 from comtypes import COMMETHOD, GUID, IUnknown
 from comtypes.automation import DISPID
@@ -122,5 +124,34 @@ def test_retrieved_outgoing_iid_is_guid_null(self):
             GetEvents(doc, sink)
 
 
+class Test_IMAPI2FS(ut.TestCase):
+    def setUp(self):
+        CLSID_MsftFileSystemImage = GUID("{2C941FC5-975B-59BE-A960-9A2A262853A5}")
+        self.image = CreateObject(CLSID_MsftFileSystemImage)
+        self.image.FileSystemsToCreate = 1  # FsiFileSystemISO9660
+        td = tempfile.TemporaryDirectory()
+        self.tmp_dir = Path(td.name)
+        self.addCleanup(td.cleanup)
+
+    def tearDown(self):
+        del self.image
+        # Force garbage collection and wait slightly to ensure COM resources
+        # are released properly between tests.
+        gc.collect()
+        time.sleep(2)
+
+    def test(self):
+        sink = object()
+        # The default event interface for IMAPI2's FileSystemImage is
+        # `DFileSystemImageEvents`. Although it inherits from `IDispatch`,
+        # it is a custom interface (`TKIND_INTERFACE`), not a dual or pure
+        # dispatch interface (`TKIND_DISPATCH`).
+        # Its methods are v-table bound, and the interface definition
+        # that comtypes generates from the type info lacks the `dispid`
+        # attributes that `GetEvents` requires.
+        with self.assertRaises(AssertionError):
+            GetEvents(self.image, sink)
+
+
 if __name__ == "__main__":
     ut.main()