Add support for coverage

.github/workflows/autotest.yml

@@ -33,7 +33,10 @@ jobs:
             pip install 'numpy<2'
             pip install pywin32
           }
-          python -m unittest discover -v -s ./comtypes/test -t comtypes\test
+          pip install coverage[toml]
+          coverage run -m unittest discover -v -s comtypes\test -t comtypes\test
+      - name: Run coverage report
+        run: coverage report
       - name: Unregister the OutProc COM server
         run: |
           cd source/CppTestSrv

comtypes/test/test_comserver.py

@@ -94,9 +94,9 @@ def test_eval(self):
         obj = self.create_object()
 
         def func():
-            return obj.eval("(1, 2, 3)")
+            return obj.eval("1 + 2")
 
-        self.assertEqual(func(), (1, 2, 3))  # type: ignore
+        self.assertEqual(func(), 3)  # type: ignore
         self._find_memleak(func)
 
     def test_get_typeinfo(self):

pyproject.toml

@@ -40,3 +40,9 @@ ignore = ["E402"]
 "comtypes/test/test_subinterface.py" = ["E401", "F401", "F403", "F405"]
 "comtypes/test/test_urlhistory.py" = ["E401", "F401", "F403", "F405", "F841"]
 "comtypes/test/test_variant.py" = ["F401", "F821", "F841"]
+
+[tool.coverage.run]
+# Specify the source directory to avoid tracking temporary files created by "test_client_regenerate_modules.py".
+# Without this, coverage track these temporary files, leading to error when trying to generate a report.
+source = ["comtypes"]
+omit = ["comtypes/gen/*", "comtypes/test/*"]