Fix LSP tests

test/lsp/test_did_save_event.vader

@@ -9,6 +9,7 @@ Before:
   call ale#test#SetFilename('dummy.txt')
 
   runtime autoload/ale/lsp.vim
+  runtime autoload/ale/lsp_linter.vim
 
   let g:ale_disable_lsp = 0
   unlet! b:ale_disable_lsp

test/lsp/test_engine_lsp_response_handling.vader

@@ -1,19 +1,42 @@
 Before:
+  Save g:ale_set_lists_synchronously
   Save g:ale_buffer_info
   Save g:ale_lsp_error_messages
+  Save g:ale_set_loclist
+  Save g:ale_set_signs
+  Save g:ale_set_quickfix
+  Save g:ale_set_highlights
+  Save g:ale_echo_cursor
+  Save g:ale_disable_lsp
+  Save g:ale_history_enabled
+  Save g:ale_history_log_output
 
+  let g:ale_disable_lsp = 0
+  let g:ale_set_lists_synchronously = 1
   let g:ale_buffer_info = {}
+  let g:ale_set_loclist = 1
+  " Disable features we don't need for these tests.
+  let g:ale_set_signs = 0
+  let g:ale_set_quickfix = 0
+  let g:ale_set_highlights = 0
+  let g:ale_echo_cursor = 0
+  let g:ale_history_enabled = 1
+  let g:ale_history_log_output = 1
 
   unlet! g:ale_lsp_error_messages
   unlet! b:ale_linters
+  unlet! b:ale_disable_lsp
 
+  call ale#linter#Reset()
   call ale#test#SetDirectory('/testplugin/test')
+  call setloclist(0, [])
 
 After:
   Restore
 
   unlet! b:ale_linters
 
+  call setloclist(0, [])
   call ale#test#RestoreDirectory()
   call ale#linter#Reset()
   call ale#lsp_linter#ClearLSPData()
@@ -281,7 +304,7 @@ Execute(LSP diagnostics responses should be handled correctly):
   \ [
   \   {
   \     'lnum': 1,
-  \     'bufnr': 3,
+  \     'bufnr': bufnr(''),
   \     'col': 1,
   \     'pattern': '',
   \     'valid': 1,

test/test_history_saving.vader

@@ -1,5 +1,6 @@
 Before:
   Save g:ale_max_buffer_history_size
+  Save g:ale_history_enabled
   Save g:ale_history_log_output
   Save g:ale_run_synchronously
   Save g:ale_enabled
@@ -54,8 +55,6 @@ After:
   " Reset the shell back to what it was before.
   let &shell = g:current_shell
   unlet g:current_shell
-  let g:ale_history_enabled = 1
-  let g:ale_history_log_output = 0
   unlet g:history
 
   call ale#engine#Cleanup(bufnr(''))

test/test_ignoring_linters.vader

@@ -1,3 +1,11 @@
+Before:
+  Save g:ale_disable_lsp
+
+After:
+  Restore
+
+  unlet! b:ale_disable_lsp
+
 Execute(GetList should ignore some invalid values):
   AssertEqual [], ale#engine#ignore#GetList('', 'foo')
   AssertEqual [], ale#engine#ignore#GetList('', 0)
@@ -98,7 +106,6 @@ Execute(Exclude should handle Dictionaries):
   \ )
 
 Execute(Exclude should filter LSP linters when g:ale_disable_lsp is set to 1):
-  let g:ale_disable_lsp = 1
   AssertEqual
   \ [
   \   {'name': 'linter1', 'aliases': [], 'lsp': ''},
@@ -116,7 +123,6 @@ Execute(Exclude should filter LSP linters when g:ale_disable_lsp is set to 1):
   \ )
 
 Execute(Exclude should filter LSP linters when b:ale_disable_lsp is set to 1):
-  let b:ale_disable_lsp = 1
   AssertEqual
   \ [
   \   {'name': 'linter1', 'aliases': [], 'lsp': ''},