Fix #219 Scope listener to the test's file
Fix #219 Scope listener to the test's file

As there is a possibility that responses from other tests are
affecting this test, additional conditionals have been inserted to
ensure that only responses for the interested file is being checked.

Signed-off-by: Remy Suen <553f7e7fc51e9ff47ae89d5a0ebd06651241b998@gmail.com>

rcjsuen/dockerfile-language-server-nodejs,rcjsuen/dockerfile-language-server-nodejs