Creating a BSON unit test

packages/realm-web/src/tests/BSON.test.ts

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+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2020 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+import { expect } from "chai";
+import { BSON } from "..";
+
+describe("BSON", () => {
+    it("expose an ObjectId constructor", () => {
+        const objectId = new BSON.ObjectId();
+        expect(objectId).instanceOf(BSON.ObjectId);
+    });
+});