Datastore tests (#551)

* common datastore tests

* fix Datastore.UpdateApp

* remove extra datastore tests

* datastore test fixes

api/datastore/bolt/bolt_test.go

@@ -0,0 +1,24 @@
+package bolt
+
+import (
+	"net/url"
+	"os"
+	"testing"
+
+	"github.com/iron-io/functions/api/datastore/internal/datastoretest"
+)
+
+const tmpBolt = "/tmp/func_test_bolt.db"
+
+func TestDatastore(t *testing.T) {
+	os.Remove(tmpBolt)
+	u, err := url.Parse("bolt://" + tmpBolt)
+	if err != nil {
+		t.Fatalf("failed to parse url:", err)
+	}
+	ds, err := New(u)
+	if err != nil {
+		t.Fatalf("failed to create bolt datastore:", err)
+	}
+	datastoretest.Test(t, ds)
+}