@Override
    public File selectAllocationBaseDirectory(int idx) {
        return allocationBaseDirs[idx];
    }
@Test
    void selectAllocationBaseDir() {
        for (int i = 0; i < allocBaseFolders.length; ++i) {
            assertThat(directoryProvider.selectAllocationBaseDirectory(i))
                    .isEqualTo(allocBaseFolders[i]);
        }
    }