}

  public void testPermutationSetFourElements() {
    Iterator<List<Integer>> permutations =
        Collections2.permutations(newArrayList(1, 2, 3, 4)).iterator();
    assertNextPermutation(newArrayList(1, 2, 3, 4), permutations);
    assertNextPermutation(newArrayList(1, 2, 4, 3), permutations);
    assertNextPermutation(newArrayList(1, 4, 2, 3), permutations);

    hasher.assertBytes(new byte[] {1, 2});
  }

  public void testInt() {
    TestHasher hasher = new TestHasher();
    hasher.putInt(0x04030201);
    hasher.assertBytes(new byte[] {1, 2, 3, 4});
  }

  public void testLong() {
    TestHasher hasher = new TestHasher();
    hasher.putLong(0x0807060504030201L);
    hasher.assertBytes(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
  }

    OutputStream out = sink.openBufferedStream();
    assertTrue(sink.wasStreamOpened());
    assertFalse(sink.wasStreamClosed());

    out.write(new byte[] {1, 2, 3, 4});
    out.close();

    assertTrue(sink.wasStreamClosed());
    assertArrayEquals(new byte[] {1, 2, 3, 4}, sink.getBytes());
  }

  public void testWrite_bytes() throws IOException {
    assertArrayEquals(new byte[0], sink.getBytes());
    sink.write(bytes);

    OutputStream out = sink.openBufferedStream();
    assertTrue(sink.wasStreamOpened());
    assertFalse(sink.wasStreamClosed());

    out.write(new byte[] {1, 2, 3, 4});
    out.close();

    assertTrue(sink.wasStreamClosed());
    assertArrayEquals(new byte[] {1, 2, 3, 4}, sink.getBytes());
  }

  public void testWrite_bytes() throws IOException {
    assertArrayEquals(new byte[0], sink.getBytes());
    sink.write(bytes);

public class ContentOutputStreamTest {

    @Test
    public void inMemory() throws IOException {
        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2, 3, 4 });
        assertFalse(cos.done);
        assertTrue(cos.isInMemory());
        cos.close();
        assertFalse(cos.done);
    }

    @Test
    public void inFile() throws IOException {

			echo -n "."
			sleep 1
		done
	done

}

# Prepare fake disks with losetup
function prepare_block_devices() {
	set -e
	mkdir -p ${WORK_DIR}/disks/ ${WORK_DIR}/mnt/
	sudo modprobe loop
	for i in 1 2 3 4; do
		dd if=/dev/zero of=${WORK_DIR}/disks/img.${i} bs=1M count=2000
		device=$(sudo losetup --find --show ${WORK_DIR}/disks/img.${i})
		sudo mkfs.ext4 -F ${device}
		mkdir -p ${WORK_DIR}/mnt/disk${i}/

<!--- reproduce this bug. Include code to reproduce, if relevant -->
<!--- and make sure you have followed https://github.com/minio/minio/tree/release/docs/debugging to capture relevant logs -->

1.
2.
3.
4.

## Context
<!--- How has this issue affected you? What are you trying to accomplish? -->
<!--- Providing context helps us come up with a solution that is most useful in the real world -->

## Regression

    Set<Integer> keySet = cache.asMap().keySet();
    assertThat(keySet).isEmpty();

    // add 0, 1, 2, 3, 4
    getAll(cache, asList(0, 1, 2, 3, 4));
    CacheTesting.drainRecencyQueues(cache);
    assertThat(keySet).containsExactly(0, 1, 2, 3, 4);

    // invalidate all
    cache.invalidateAll();
    CacheTesting.drainRecencyQueues(cache);
    assertThat(keySet).isEmpty();

        }

        @Test
        void shouldReturnInetAddressHostAddressWhenWrappedIsInetAddress() {
            when(mockInetAddress.getHostAddress()).thenReturn("1.2.3.4");
            UniAddress uniAddress = new UniAddress(mockInetAddress);
            assertEquals("1.2.3.4", uniAddress.getHostAddress());
        }

        @Test
        void shouldReturnNbtAddressHostAddressWhenWrappedIsNbtAddress() {

  }

  public void testPermutationSetFourElements() {
    Iterator<List<Integer>> permutations =
        Collections2.permutations(newArrayList(1, 2, 3, 4)).iterator();
    assertNextPermutation(newArrayList(1, 2, 3, 4), permutations);
    assertNextPermutation(newArrayList(1, 2, 4, 3), permutations);
    assertNextPermutation(newArrayList(1, 4, 2, 3), permutations);