Update Mongo DB

Update01.java

  @Test
  public void testReplaceDocument() {
    MongoCollection<Document> artists = testDb.getCollection("artists");
    Bson queryFilter = new Document("_id", band1Id);
    Document myBand = artists.find(queryFilter).iterator().tryNext();
    Assert.assertEquals(
        "Make sure that the band created in the database is"
            + " the same as the band retrieved from the database",
        bandOne,
        myBand);
    Document replaceBand = new Document();
    replaceBand.append("title", "Gorillaz");
    artists.replaceOne(eq("_id", band1Id), replaceBand);
    Document myNewBand = artists.find(queryFilter).iterator().tryNext();
    Assert.assertEquals(myNewBand.get("_id"), band1Id);
    Assert.assertEquals(myNewBand.get("title"), "Gorillaz");
    Assert.assertNull(myNewBand.get("num_albums"));
    Assert.assertNull(myNewBand.get("genre"));
    Assert.assertNull(myNewBand.get("rating"));
  }