What is the test for a federal district court to review a final judgment of a bankruptcy judge's findings?

In addition, the Rule provides for district court review as a safeguard against bankruptcy court abuses. Section (e)(2)(B) of the Rule permits a district court to make a de novo review of the bankruptcy judge's findings. Any abuses may be rectified by the district court without applying the stringent "clearly erroneous" test. See United States v. Raddatz, 447 U.S. 667, 100 S.Ct. 2406, 65 L.Ed.2d 424 (1980). Section (e)(1) of the Rule grants an appeal of the final judgment of the bankruptcy judge as a matter of right.