Use tmpfs containers for api/api4 tests, move and speed up CLI tests (#7606)

* use tmpfs containers for api/api4, move and speed up cli tests

* minor optimizations

* add missing files, fix pre-existing race condition

* add . to TestMain check

* add requested log message

api/api_test.go

@@ -0,0 +1,48 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api
+
+import (
+	"flag"
+	"os"
+	"testing"
+
+	l4g "github.com/alecthomas/log4go"
+
+	"github.com/mattermost/mattermost-server/store/storetest"
+	"github.com/mattermost/mattermost-server/utils"
+)
+
+func TestMain(m *testing.M) {
+	flag.Parse()
+
+	// In the case where a dev just wants to run a single test, it's faster to just use the default
+	// store.
+	if filter := flag.Lookup("test.run").Value.String(); filter != "" && filter != "." {
+		utils.TranslationsPreInit()
+		utils.LoadConfig("config.json")
+		l4g.Info("-test.run used, not creating temporary containers")
+		os.Exit(m.Run())
+	}
+
+	utils.TranslationsPreInit()
+	utils.LoadConfig("config.json")
+	utils.InitTranslations(utils.Cfg.LocalizationSettings)
+
+	status := 0
+
+	container, settings, err := storetest.NewMySQLContainer()
+	if err != nil {
+		panic(err)
+	}
+
+	UseTestStore(container, settings)
+
+	defer func() {
+		StopTestStore()
+		os.Exit(status)
+	}()
+
+	status = m.Run()
+}