Add store unit tests and add make target for testing store with postgres (#5925)

* Add store unit tests and add make target for testing store with postgres

* Remove postgres target form test-server target

* Fix audit test

store/sql_upgrade_test.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"testing"
+
+	"github.com/mattermost/platform/model"
+)
+
+func TestStoreUpgrade(t *testing.T) {
+	Setup()
+
+	saveSchemaVersion(store.(*SqlStore), VERSION_3_0_0)
+	UpgradeDatabase(store.(*SqlStore))
+
+	store.(*SqlStore).SchemaVersion = ""
+	UpgradeDatabase(store.(*SqlStore))
+}
+
+func TestSaveSchemaVersion(t *testing.T) {
+	Setup()
+
+	saveSchemaVersion(store.(*SqlStore), VERSION_3_0_0)
+	if result := <-store.System().Get(); result.Err != nil {
+		t.Fatal(result.Err)
+	} else {
+		props := result.Data.(model.StringMap)
+		if props["Version"] != VERSION_3_0_0 {
+			t.Fatal("version not updated")
+		}
+	}
+
+	if store.(*SqlStore).SchemaVersion != VERSION_3_0_0 {
+		t.Fatal("version not updated")
+	}
+
+	saveSchemaVersion(store.(*SqlStore), model.CurrentVersion)
+}