Add tests for the goimports fixer commands

test/fixers/test_goimports_fixer_callback.vader

@@ -7,16 +7,35 @@ Before:
   let g:ale_go_goimports_options = ''
 
   call ale#test#SetDirectory('/testplugin/test/fixers')
+  call ale#test#SetFilename('../go_files/testfile.go')
 
 After:
   Restore
 
   call ale#test#RestoreDirectory()
 
-Execute(The goimports callback should return 0 with bad executable):
+Execute(The goimports callback should return 0 when the executable isn't executable):
-  call ale#test#SetFilename('../go_files/testfile.go')
-
   AssertEqual
   \ 0,
   \ ale#fixers#goimports#Fix(bufnr(''))
 
+Execute(The goimports callback should the command when the executable test passes):
+  let g:ale_go_goimports_executable = has('win32') ? 'cmd' : 'echo'
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_go_goimports_executable) . ' -l -w %t'
+  \ },
+  \ ale#fixers#goimports#Fix(bufnr(''))
+
+Execute(The goimports callback should include extra options):
+  let g:ale_go_goimports_executable = has('win32') ? 'cmd' : 'echo'
+  let g:ale_go_goimports_options = '--xxx'
+
+  AssertEqual
+  \ {
+  \   'read_temporary_file': 1,
+  \   'command': ale#Escape(g:ale_go_goimports_executable) . ' -l -w --xxx %t'
+  \ },
+  \ ale#fixers#goimports#Fix(bufnr(''))