tests: improve error reporting

Found in some stash, untested.

autoload/neomake.vim

@@ -92,7 +92,9 @@ if s:is_testing
         try
             let r = s:make_info[make_id]
         catch
-            let g:neomake_test_errors += [printf('GetMakeOptions failed: %s (in %s)', v:exception, v:throwpoint)]
+            let msg = printf('GetMakeOptions failed: %s (in %s)', v:exception, v:throwpoint)
+            call vader#log(msg)
+            let g:neomake_test_errors += [msg]
             return {'verbosity': 3}
         endtry
         return r

tests/include/init.vim

@@ -446,6 +446,11 @@ function! s:After()
   if !empty(actions)
     call add(errors, printf('action_queue is not empty: %d entries: %s',
           \ len(actions), string(status.action_queue)))
+    try
+      call neomake#CancelAllMakes(1)
+    catch
+      call add(errors, v:exception)
+    endtry
   endif
 
   if exists('#neomake_tests')
@@ -513,7 +518,8 @@ function! s:After()
   endif
 
   if !empty(errors)
-    throw len(errors).' error(s) in teardown: '.join(errors, "\n")
+    call map(errors, "printf('%d. %s', v:key+1, v:val)")
+    throw len(errors)." error(s) in teardown:\n".join(errors, "\n")
   endif
 endfunction
 command! NeomakeTestsGlobalAfter call s:After()