Add tests for ALEFix commandline parameters

test/fix/test_ale_fix.vader

@@ -272,6 +272,15 @@ Expect(An extra line should be added):
   c
   d
 
+Execute(ALEFix should use fixers passed in commandline when provided):
+  let g:ale_fixers.testft = ['RemoveLastLine']
+  ALEFix AddCarets AddDollars
+
+Expect(Only fixers passed via command line should be run):
+  $^a
+  $^b
+  $^c
+
 Execute(ALEFix should allow temporary files to be read):
   if has('win32')
     " Just skip this test on Windows, we can't run it.

test/fix/test_ale_fix_completion.vader

@@ -0,0 +1,23 @@
+Execute (List of available fixers is empty):
+  call ale#fix#registry#Clear()
+
+Then (List of applicable fixers for python file is empty):
+  AssertEqual [], ale#fix#registry#GetApplicableFixers('python')
+
+Execute (Add ruby fixer):
+  call ale#fix#registry#Add('ruby_fixer', 'fixer_fun', ['ruby'], 'ruby fixer')
+
+Then (List of applicable fixers for python file is still empty):
+  AssertEqual [], ale#fix#registry#GetApplicableFixers('python')
+
+Execute (Add generic fixer):
+  call ale#fix#registry#Add('generic_fixer', 'fixer_fun', [], 'generic fixer')
+
+Then (Generic fixer should be returned as applicable for python file):
+  AssertEqual ['generic_fixer'], ale#fix#registry#GetApplicableFixers('python')
+
+Execute (Add python fixer):
+  call ale#fix#registry#Add('python_fixer', 'fixer_func', ['python'], 'python fixer')
+
+Then (List of fixers should contain both generic and python fixers):
+  AssertEqual ['generic_fixer', 'python_fixer'], ale#fix#registry#GetApplicableFixers('python')