}

    @Test
    @DisplayName("acquire after release reacquires underlying tree connection")
    void acquireAfterReleaseReacquires() {
        // After dropping to zero, acquire() should reacquire the underlying connection
        // Drop usage to zero
        handle.release();
        verify(treeConnection, times(1)).release();

        // Acquire from 0 -> 1 should acquire underlying

        SmbTreeHandleImpl t2 = h.getTree();

        assertSame(tree, t1, "Expected same mocked tree");
        assertSame(tree, t2, "Expected same mocked tree");

        // acquire is called once in ctor + once per getTree() call
        verify(tree, times(3)).acquire();
    }

    @Test
    @DisplayName("isValid() true when open, same tree id, connected")
    void isValid_true_whenOpenSameTreeConnected() {

                            SmbConstants.ATTR_NORMAL, 0);
                }
                // one extra acquire to keep this open till the stream is released
                return this.handle.acquire();
            }

        }
        log.trace("Pipe already open");
        return this.handle.acquire();
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.SmbPipeHandle#getInput()
     */

        assertTrue(session.isInUse(), "New session should be in use due to transport acquisition");

        // Test additional acquire
        session.acquire();
        assertTrue(session.isInUse(), "Session should still be in use after additional acquire");

        // Test release (still in use because of initial transport acquire)
        session.release();

    limiter.acquire(Integer.MAX_VALUE / 4);
    limiter.acquire(Integer.MAX_VALUE / 2);
    limiter.acquire(Integer.MAX_VALUE);
    assertEvents("R0.00", "R0.00", "R0.00"); // no wait, infinite rate!

    limiter.setRate(2.0);
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    assertEvents(

    limiter.acquire(Integer.MAX_VALUE / 4);
    limiter.acquire(Integer.MAX_VALUE / 2);
    limiter.acquire(Integer.MAX_VALUE);
    assertEvents("R0.00", "R0.00", "R0.00"); // no wait, infinite rate!

    limiter.setRate(2.0);
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    limiter.acquire();
    assertEvents(

        verify(pipe, times(1)).ensureTreeConnected();
        verify(tree, times(2)).acquire();
    }

    @Test
    @DisplayName("isOpen and isStale reflect underlying handle validity")
    void testIsOpenAndIsStale() throws CIFSException {
        when(pipe.ensureTreeConnected()).thenReturn(tree);
        when(tree.acquire()).thenReturn(tree);

        c.acquire();
        verify(tree, times(1)).acquire();

        // Act: second acquire does not call tree.acquire again
        c.acquire();
        verify(tree, times(1)).acquire();

        // Act: first release does not release yet (usage -> 1)
        c.release();
        verify(tree, never()).release();

        // Act: second release (usage -> 0) releases the tree
        c.release();

        SmbTreeHandleInternal t2 = handle.ensureTreeConnected();

        // Assert
        assertSame(tree, t1, "First acquire returns provided tree");
        assertSame(tree, t2, "Subsequent acquire returns same tree instance");
        verify(pipe, times(1)).ensureTreeConnected();
        verify(tree, times(2)).acquire();
    }

    @Test
    @DisplayName("getInput/getOutput return cached streams when open; throw when closed")

        // Acquire session multiple times
        for (int i = 0; i < threadCount - 1; i++) {
            session.acquire();
        }

        // When - Multiple threads try to release/acquire concurrently
        for (int t = 0; t < threadCount; t++) {
            final boolean shouldRelease = (t < 3); // First 3 threads release, others acquire

            executor.submit(() -> {