Before:
    runtime ale_linters/scala/scalac.vim

After:
    call ale#linter#Reset()

Given scala(An empty Scala file):

Execute(The default executable and command should be correct):
  AssertEqual 'scalac', ale_linters#scala#scalac#GetExecutable(bufnr(''))
  AssertEqual
  \ ale#Escape('scalac') . ' -Ystop-after:parser %t',
  \ ale_linters#scala#scalac#GetCommand(bufnr(''))

Given scala.sbt(An empty SBT file):
Execute(scalac should not be run for sbt files):
  AssertEqual '', ale_linters#scala#scalac#GetExecutable(bufnr(''))
  AssertEqual '', ale_linters#scala#scalac#GetCommand(bufnr(''))