add one more config test (#7853)

cmd/platform/mattermost_test.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package main
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/utils"
+)
+
+func TestConfigFlag(t *testing.T) {
+	dir, err := ioutil.TempDir("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	utils.TranslationsPreInit()
+	config := utils.LoadGlobalConfig("config.json")
+	configPath := filepath.Join(dir, "foo.json")
+	require.NoError(t, ioutil.WriteFile(configPath, []byte(config.ToJson()), 0600))
+
+	os.Mkdir(filepath.Join(dir, "i18n"), 0700)
+	i18n, ok := utils.FindDir("i18n")
+	require.True(t, ok)
+	en, err := os.Open(filepath.Join(i18n, "en.json"))
+	require.NoError(t, err)
+	defer en.Close()
+	dest, err := os.OpenFile(filepath.Join(dir, "i18n", "en.json"), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
+	require.NoError(t, err)
+	defer dest.Close()
+	_, err = io.Copy(dest, en)
+	require.NoError(t, err)
+
+	prevDir, err := os.Getwd()
+	require.NoError(t, err)
+	defer os.Chdir(prevDir)
+	os.Chdir(dir)
+
+	require.Error(t, runCommand(t, "version"))
+	checkCommand(t, "--config", "foo.json", "version")
+	checkCommand(t, "--config", "./foo.json", "version")
+	checkCommand(t, "--config", configPath, "version")
+}