Add a comment about the test discovery type aliases.

Author: ericsnowcurrently

src/client/common/process/internal.ts

@@ -32,6 +32,10 @@ import { PythonVersionInfo } from './types';
 // For each of those subdirectories there is a sub-namespace where
 // those scripts' functions may be found.
 //
+// In some cases one or more types related to a script are exported
+// from the same namespace in which the script's function is located.
+// These types typically relate to the return type of "parse()".
+//
 // ignored scripts:
 //  * install_debugpy.py  (used only for extension development)
 //  * ptvsd_launcher.py  (used only for the old debug adapter)

src/client/testing/common/services/types.ts

@@ -7,6 +7,8 @@ import { Uri } from 'vscode';
 import { scripts as internalScripts } from '../../../common/process/internal';
 import { Tests } from '../types';
 
+// We expose these here as a convenience and to cut down on churn
+// elsewhere in the code.
 export type DiscoveredTests = internalScripts.testing_tools.DiscoveredTests;
 export type Test = internalScripts.testing_tools.Test;
 export type TestFolder = internalScripts.testing_tools.TestFolder;