Fix #1358, fix #1369 - Lint the package on save for go vet instead

test/command_callback/test_govet_command_callback.vader

@@ -0,0 +1,16 @@
+Before:
+  runtime ale_linters/go/govet.vim
+
+  call ale#test#SetDirectory('/testplugin/test/command_callback')
+
+After:
+  Restore
+
+  call ale#linter#Reset()
+  call ale#test#RestoreDirectory()
+
+Execute(The default command should be correct):
+  AssertEqual
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
+  \ . ' go vet .',
+  \ ale_linters#go#govet#GetCommand(bufnr(''))

test/handler/test_govet_handler.vader

@@ -0,0 +1,28 @@
+Before:
+  runtime ale_linters/go/govet.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The govet handler should return the correct filenames):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 27,
+  \     'col': 0,
+  \     'text': 'some error',
+  \     'type': 'E',
+  \     'filename': ale#path#Simplify(expand('%:p:h') . '/test.go'),
+  \   },
+  \   {
+  \     'lnum': 27,
+  \     'col': 5,
+  \     'text': 'some error with a column',
+  \     'type': 'E',
+  \     'filename': ale#path#Simplify(expand('%:p:h') . '/other.go'),
+  \   },
+  \ ],
+  \ ale_linters#go#govet#Handler(bufnr(''), [
+  \   'test.go:27: some error',
+  \   'other.go:27:5: some error with a column',
+  \ ])