Describe the bug

Running Homebrew tests that require binaries managed by asdf can fail, in this instance with this message:
unknown command: node. Perhaps you have to reshim?

This appears to be because in the test environment the HOME environment variable is changed by Homebrew. It appears as though asdf depends on this.

Homebrew Node.js installations and nvm do not have this problem, but as mentioned in #785 maybe this is unavoidable and should just be added to the Common Homebrew Issues section?

To Reproduce

1. brew update
2. brew install emscripten
3. brew test emscripten

Expected behavior

The test to run.

Actual behavior

The node command was not found.