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Unit Test BulkWriteAsync using C#

I am having trouble writing a unit test for a method that uses Mongo Driver BulkWriteAsync().
The return for BulkWriteAsync() is BulkWriteResult which is an abstract class and I am not able to mock it. So I create a concrete class call MockBulkWriteResult which inherits BulkWriteResult.

Here is a sample code:
var response = new MockBulkWriteResult(5);

        var mockCollection = new Mock<IMongoCollection<Dto>>();
        mockCollection
            .Setup(x => x.BulkWriteAsync(
                It.IsAny<List<WriteModel<HierarchyDto>>>(),
                It.IsAny<BulkWriteOptions>(),
                It.IsAny<CancellationToken>()))
            .Returns(Task.FromResult(response));

Any suggestions?