public async Task InMemoryEntityRepository_WhenDeleteOneIsCalled_ThenOneItemIsRemovedFromDataSet() { var _repository = new InMemoryEntityRepository <EntityBase>(); var testRecords = GenerateTestEntities(5); var recordToDelete = testRecords[0]; for (int i = 0; i < testRecords.Length; i++) { await _repository.InsertOneAsync(testRecords[i]); } var resultsBeforeDeletion = await _repository.FindAllAsync(); await _repository.DeleteOneAsync(recordToDelete.Id); var resultsAfterDeletion = await _repository.FindAllAsync(); Assert.Contains(recordToDelete, resultsBeforeDeletion); Assert.DoesNotContain(recordToDelete, resultsAfterDeletion); }