add tests for client.dynamic (enthought#440)

comtypes/test/test_client_dynamic.py

@@ -0,0 +1,67 @@
+import ctypes
+import unittest as ut
+from unittest import mock
+
+from comtypes import automation, COMError, IUnknown
+from comtypes.client import CreateObject, dynamic, GetModule, lazybind
+
+
+class Test_Dispatch_Function(ut.TestCase):
+    # It is difficult to cause intentionally errors "in the regular way".
+    # So `mock` is used to cover conditional branches.
+    def test_returns_dynamic_Dispatch_if_takes_dynamic_Dispatch(self):
+        obj = mock.MagicMock(spec=dynamic._Dispatch)
+        self.assertIs(dynamic.Dispatch(obj), obj)
+
+    def test_returns_lazybind_Dispatch_if_takes_ptrIDispatch(self):
+        # Conditional branches that return `lazybind.Dispatch` are also covered by
+        # `test_dyndispatch` and others.
+        obj = mock.MagicMock(spec=ctypes.POINTER(automation.IDispatch))
+        self.assertIsInstance(dynamic.Dispatch(obj), lazybind.Dispatch)
+
+    def test_returns_dynamic_Dispatch_if_takes_ptrIDispatch_and_raised_comerr(self):
+        obj = mock.MagicMock(spec=ctypes.POINTER(automation.IDispatch))
+        obj.GetTypeInfo.side_effect = COMError(0, "test", ("", "", "", 0, 0))
+        self.assertIsInstance(dynamic.Dispatch(obj), dynamic._Dispatch)
+
+    def test_returns_dynamic_Dispatch_if_takes_ptrIDispatch_and_raised_winerr(self):
+        obj = mock.MagicMock(spec=ctypes.POINTER(automation.IDispatch))
+        obj.GetTypeInfo.side_effect = WindowsError()
+        self.assertIsInstance(dynamic.Dispatch(obj), dynamic._Dispatch)
+
+    def test_returns_what_is_took_if_takes_other(self):
+        obj = object()
+        self.assertIs(dynamic.Dispatch(obj), obj)
+
+
+class Test_Dispatch_Class(ut.TestCase):
+    # `MethodCaller` and `_Collection` are indirectly covered in this.
+    def test_dict(self):
+        # The following conditional branches are not covered;
+        # - not `hresult in ERRORS_BAD_CONTEXT`
+        # - not `0 != enum.Skip(index)`
+        # - other than `COMError` raises in `__getattr__`
+        orig = CreateObject("Scripting.Dictionary", interface=automation.IDispatch)
+        d = dynamic._Dispatch(orig)
+        d.CompareMode = 42
+        d.Item["foo"] = 1
+        d.Item["bar"] = "spam foo"
+        d.Item["baz"] = 3.14
+        self.assertEqual(d[0], "foo")
+        self.assertEqual(d.Item["foo"], 1)
+        self.assertEqual([k for k in iter(d)], ["foo", "bar", "baz"])
+        self.assertIsInstance(hash(d), int)
+        d._FlagAsMethod("_NewEnum")
+        self.assertIs(type(d._NewEnum()), ctypes.POINTER(IUnknown))
+        scrrun = GetModule("scrrun.dll")
+        scr_dict = d.QueryInterface(scrrun.IDictionary)
+        self.assertIsInstance(scr_dict, scrrun.IDictionary)
+        d.Item["qux"] = scr_dict
+        with self.assertRaises(IndexError):
+            d[4]
+        with self.assertRaises(AttributeError):
+            d.__foo__
+
+
+if __name__ == "__main__":
+    ut.main()