#1206 Add support for setting options for gobuild, and escape paths better

test/command_callback/test_gobuild_command_callback.vader

@@ -0,0 +1,52 @@
+Before:
+  Save g:ale_go_gobuild_options
+
+  unlet! g:ale_go_gobuild_options
+
+  let g:env_prefix = has('win32')
+  \ ? 'set GOPATH=' . ale#Escape('/foo/bar') . ' && '
+  \ : 'GOPATH=' . ale#Escape('/foo/bar') . ' '
+
+  runtime ale_linters/go/gobuild.vim
+
+  call ale#test#SetDirectory('/testplugin/test/command_callback')
+
+  call ale_linters#go#gobuild#ResetEnv()
+
+After:
+  Restore
+
+  unlet! g:env_prefix
+
+  call ale#linter#Reset()
+  call ale#test#RestoreDirectory()
+
+Execute(The default gobuild command should be correct):
+  AssertEqual
+  \ ale_linters#go#gobuild#GetCommand(bufnr(''), ['/foo/bar', '/foo/baz']),
+  \ g:env_prefix . 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
+  \   . 'go test -c -o /dev/null ./'
+
+Execute(The command for getting GOPATH should be correct):
+  AssertEqual ale_linters#go#gobuild#GoEnv(bufnr('')), 'go env GOPATH GOROOT'
+
+  call ale_linters#go#gobuild#GetCommand(bufnr(''), ['/foo/bar', '/foo/baz'])
+
+  " We shouldn't run `go env` many times after we've got it.
+  AssertEqual ale_linters#go#gobuild#GoEnv(bufnr('')), ''
+
+Execute(The GOPATH output should be used after it has been read once):
+  call ale_linters#go#gobuild#GetCommand(bufnr(''), ['/foo/bar', '/foo/baz'])
+
+  AssertEqual
+  \ ale_linters#go#gobuild#GetCommand(bufnr(''), []),
+  \ g:env_prefix . 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
+  \   . 'go test -c -o /dev/null ./'
+
+Execute(Extra options should be supported):
+  let g:ale_go_gobuild_options = '--foo-bar'
+
+  AssertEqual
+  \ ale_linters#go#gobuild#GetCommand(bufnr(''), ['/foo/bar', '/foo/baz']),
+  \ g:env_prefix . 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
+  \   . 'go test --foo-bar -c -o /dev/null ./'