add a test fo rmongo

test/functional/mongodb/basic/mongo-repository/mongo-repository.ts

@@ -87,5 +87,29 @@ describe("mongodb > MongoRepository", () => {
     })));
 
     // todo: cover other methods as well
+    it("should be able to save and update mongo entities", () => Promise.all(connections.map(async connection => {
+        const postRepository = connection.getMongoRepository(Post);
+
+        // save few posts
+        const firstPost = new Post();
+        firstPost.title = "Post #1";
+        firstPost.text = "Everything about post #1";
+        await postRepository.save(firstPost);
+
+        const secondPost = new Post();
+        secondPost.title = "Post #2";
+        secondPost.text = "Everything about post #2";
+        await postRepository.save(secondPost);
 
+        // save few posts
+        firstPost.text = "Everything and more about post #1";
+        await postRepository.save(firstPost);
+
+        const loadedPosts = await postRepository.find();
+
+        loadedPosts.length.should.be.equal(2);
+        loadedPosts[0].text.should.be.equal("Everything and more about post #1");
+        loadedPosts[0].text.should.be.equal("Everything about post #2");
+
+    })));
 });