title: Intellisense not working golang test files
body: <p>Title says it all. I open a test file. Type <code>$package.</code>. Nothing comes up. It's not a delay issue. It's not an empty package. How do I get intellisense to turn on?</p>
  <p>Update: I've open a bug ticket with the VSCode-Golang team. As we find more information, I'll report back here. <a href="https://github.com/Microsoft/vscode-go/issues/2278" rel="nofollow noreferrer">https://github.com/Microsoft/vscode-go/issues/2278</a></p>