public void IsBucketReturnsFalseIfNoCurrentProvider(SwitchingBucketProvider sut, Item item)
 {
   sut.IsBucket(item).Should().BeFalse();
 }
 public void ShouldCallIsBucket([Frozen] BucketProvider current, BucketProviderSwitcher switcher, SwitchingBucketProvider sut, Item item)
 {
   current.IsBucket(item).Returns(true);
   sut.IsBucket(item).Should().BeTrue();
 }