_, err = erasure.Decode(context.Background(), writer, bitrotReaders, test.offset, test.length, test.data, nil)
		closeBitrotReaders(bitrotReaders)
		if err != nil && !test.shouldFail {
			t.Errorf("Test %d: should pass but failed with: %v", i, err)
		}
		if err == nil && test.shouldFail {
			t.Errorf("Test %d: should fail but it passed", i)
		}
		if err == nil {