Merge branch 'mitsos1os-ts-jest-swagger'

Author: kamilmysliwiec

content/openapi/cli-plugin.md

@@ -197,3 +197,29 @@ With this in place, import AST transformer within your `jest` configuration file
   }
 }
 ```
+
+#### Troubleshooting `jest` (e2e tests)
+
+In case `jest` does not seem to pick up your configuration changes, it's possible that Jest has already **cached** the build result. To apply the new configuration, you need to clear Jest's cache directory.
+
+To clear the cache directory, run the following command in your NestJS project folder:
+
+```bash
+$ npx jest --clearCache
+```
+
+In case the automatic cache clearance fails, you can still manually remove the cache folder with the following commands:
+
+```bash
+# Find jest cache directory (usually /tmp/jest_rs)
+# by running the following command in your NestJS project root
+$ npx jest --showConfig | grep cache
+# ex result:
+#   "cache": true,
+#   "cacheDirectory": "/tmp/jest_rs"
+
+# Remove or empty the Jest cache directory
+$ rm -rf  <cacheDirectory value>
+# ex:
+# rm -rf /tmp/jest_rs
+```