@BeforeEach
    void setUp() {
        testCache = new TestBufferCacheImpl(5, 1024); // 5 buffers of 1KB each
    }

    @Test
    @DisplayName("BufferCache interface should define correct method signatures")
    void testInterfaceContract() {
        // Given
        BufferCache cache = mockBufferCache;

        // When & Then - verify interface methods exist and can be called

                        + " but there is no POM in this directory (" + session.getExecutionRootDirectory() + ")."
                        + " Please verify you invoked Maven from the correct directory.");
            }

            List<TaskSegment> taskSegments = lifecycleTaskSegmentCalculator.calculateTaskSegments(session);

  }

  private static void assertPutString(char[] chars) {
    Hasher h1 = new NonStreamingVersion().newHasher();
    Hasher h2 = new NonStreamingVersion().newHasher();
    String s = new String(chars);
    // this is the correct implementation of the spec
    for (int i = 0; i < s.length(); i++) {
      h1.putChar(s.charAt(i));
    }
    h2.putUnencodedChars(s);
    assertEquals(h1.hash(), h2.hash());
  }

    assertThat(frameLog(true, 3, 10000, TYPE_DATA, 0x20))
      .isEqualTo("<< 0x00000003 10000 DATA          COMPRESSED")
  }

  /**
   * Ensures that valid flag combinations appear visually correct, and invalid show in hex.  This
   * also demonstrates how sparse the lookup table is.
   */
  @Test
  fun allFormattedFlagsWithValidBits() {

        String inner = s.substring("SmbComLogoffAndX[".length(), s.length() - 1);
        assertFalse(inner.isEmpty(), "inner part of toString should not be empty");
    }

    @Test
    @DisplayName("constructor sets correct command value")
    void constructorSetsCorrectCommand() {
        SmbComLogoffAndX msg = new SmbComLogoffAndX(null);
        assertNotNull(msg, "Message should not be null");
        // SMB_COM_LOGOFF_ANDX = 0x74

You will see the automatic API docs for the sub-application, including only its own _path operations_, all under the correct sub-path prefix `/subapi`:

<img src="/img/tutorial/sub-applications/image02.png">

        // Verify content
        assertArrayEquals(new byte[] { (byte) 0xFF, 0x01, 0x02, 0x03, 0x00 }, dest, "Encoded bytes should be placed at the correct offset");
    }

    @Test
    void testEncodeZeroLength() {
        // Test encoding with zero length
        byte[] data = { 0x01, 0x02, 0x03 };
        ByteEncodable encodable = new ByteEncodable(data, 0, 0);

      // We must switch the old buffer to read mode to extract data
      Java8Compatibility.flip(buffer);

      newBuffer.put(buffer);

      // Swap references, newBuffer is already in write mode at the correct position
      this.buffer = newBuffer;
    }

    @Override
    public Hasher putByte(byte b) {
      ensureCapacity(Byte.BYTES);
      buffer.put(b);
      return this;
    }

     */
    @ParameterizedTest
    @MethodSource("provideErrorClassAndCodeForGetErrorString")
    @DisplayName("getErrorString should return correct messages for all defined error classes and codes")
    void testGetErrorString(int errorClass, int errorCode, String expectedMessage) {
        assertEquals(expectedMessage, NbtException.getErrorString(errorClass, errorCode),

Let's look at how we can make that work.

## pytest.mark.anyio { #pytest-mark-anyio }