This is a vscode extension, which helps you navigate to test files directly. The current version only supports Ruby and doesn't provide the possibility for any configuration.
When a source file is opened in vscode, trigger the Toggle Test File command and the extension will search for the corresponding source/test file and open it.
When source files with the same name exist (in different directories), the user can select the right one.
For now only ruby is supported.
For now, no settings are supported.