Update migrate-1-0-28.md

Added section for tests at migration guide.
Fix: parse-community#385 (comment)

Author: fischerscode

docs/migrate-1-0-28.md

@@ -43,6 +43,10 @@ Parse().initialize(
 );
 ```
 
+### optional: adjust your tests
+You tests might fail if the package tries to automatically discover facts like you applications name, version, package name or the default file directory.
+You can avoid this automatic discovery by providing values for `appName`, `appVersion`, `appPackageName` as well as `fileDirectory` at you `Parse().initialize()` call.
+
 ### changed network library
 In order to provide a `ProgressCallback` for heavy file operations,
 the network library was switched from [http](https://pub.dev/packages/http) to [dio](https://pub.dev/packages/dio).