docs: update documents for application testing

docs/src/automated-testing.md

@@ -9,3 +9,11 @@ Only very simple launch and behavioral tests for the template main screen have b
 Currently, the test specification file is located in the `tests` directory and the test results file is located in `tests/results`. (The built-in test specification file does not generate a separate results file.)
 
 The Playwright configuration is `playwright.config.ts` in the project root, see the following documentation for more information on this: https://playwright.dev/docs/test-configuration
+
+Once everything is configured, you can run a test with the following command.
+
+```shell
+$ npm run test
+```
+
+Before running the test, empty the build directory (`dist`) and compile the package for the test.