Get tests running and passing with NeoVim 0.2 and 0.3

test/sign/test_linting_sets_signs.vader

@@ -44,6 +44,7 @@ After:
 
   sign unplace *
   let g:ale_buffer_info = {}
+  call ale#engine#Cleanup(bufnr(''))
   call ale#linter#Reset()
 
 Execute(The signs should be updated after linting is done):

test/sign/test_sign_placement.vader

@@ -1,9 +1,20 @@
 Before:
-  Save g:ale_set_signs
   Save g:ale_buffer_info
+  Save g:ale_echo_cursor
+  Save g:ale_run_synchronously
+  Save g:ale_set_highlights
+  Save g:ale_set_loclist
+  Save g:ale_set_quickfix
+  Save g:ale_set_signs
 
-  let g:ale_set_signs = 1
   let g:ale_buffer_info = {}
+  let g:ale_run_synchronously = 1
+  let g:ale_set_signs = 1
+  " Disable features we don't need for these tests.
+  let g:ale_set_quickfix = 0
+  let g:ale_set_loclist = 0
+  let g:ale_set_highlights = 0
+  let g:ale_echo_cursor = 0
 
   call ale#linter#Reset()
   sign unplace *
@@ -122,8 +133,7 @@ Given testft(A file with warnings/errors):
   fifth line
 
 Execute(The current signs should be set for running a job):
-  call ale#Lint()
-  call ale#engine#WaitForJobs(2000)
+  ALELint
 
   AssertEqual
   \ [