iterator.next().use {
      assertThat(it.key()).isEqualTo("c")
      it.assertValue(0, "c1")
      it.assertValue(1, "c2")
    }
    assertThat(iterator.hasNext()).isFalse()
    assertFailsWith<NoSuchElementException> {
      iterator.next()
    }
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)