handle.ensureOpen();
        assertTrue(handle.isOpen());

        // Simulate invalidation
        assertFalse(handle.isOpen(), "Becomes not open when underlying handle invalid");

        // After close, report stale
        handle.close();
        assertTrue(handle.isStale(), "Closed handle reports stale");
    }

    @Test

         */
        @Test
        public void testIsOpen_ReturnsTrueWhenOpen() {
            when(smbPipeHandle.isOpen()).thenReturn(true);
            assertTrue(smbPipeHandle.isOpen(), "isOpen() should return true when the handle is open.");
        }

        /**
         * Verifies that the isOpen method returns false for a closed handle.
         */
        @Test

 */
package jcifs;

/**
 * Handle to an open file
 *
 * @author mbechler
 *
 */
public interface SmbFileHandle extends AutoCloseable {

    /**
     * Returns the tree handle associated with this file handle
     *
     * @return the tree
     */
    SmbTreeHandle getTree();

    /**
     * Checks if this file handle is still valid
     *

            assertEquals(mockBinding, handle.getBinding());
            assertTrue(handle.getMaxRecv() > 0);
            assertTrue(handle.getMaxXmit() > 0);
            assertEquals("test_server", handle.getServer());
            assertEquals("test_server_dfs", handle.getServerWithDfs());
            assertEquals(mockContext, handle.getTransportContext());

         * Constructs a SamrCloseHandle request.
         *
         * @param handle The policy handle to close
         */
        public SamrCloseHandle(final rpc.policy_handle handle) {
            this.handle = handle;
        }

        @Override
        public void encode_in(final NdrBuffer _dst) throws NdrException {
            this.handle.encode(_dst);
        }

        @Override

         * Constructs a SamrCloseHandle request.
         *
         * @param handle The policy handle to close
         */
        public SamrCloseHandle(final rpc.policy_handle handle) {
            this.handle = handle;
        }

        @Override
        public void encode_in(final NdrBuffer _dst) throws NdrException {
            handle.encode(_dst);
        }

        @Override

        }

        @Test
        @DisplayName("should handle null policy handle")
        void testNullPolicyHandleHandled() {
            // Act & Assert - The constructor accepts null policy handle without throwing
            assertDoesNotThrow(() -> new MsrpcSamrConnect2("\\\\srv", 0, null));
        }

        @Test
        @DisplayName("should handle empty string as system name")
        void testEmptySystemName() {

        SamrPolicyHandle handle = new SamrPolicyHandle(mockHandle, server, access);
        handle.close();

        // Verify close was called
        verify(mockHandle, times(1)).sendrecv(any(MsrpcSamrCloseHandle.class));
        assertEquals(handle, closeCaptor.getValue().handle); // Verify correct handle is passed
    }

    @Test

        assertSame(pipe, handle.getPipe(), "Handle should reference originating pipe");
        assertSame(handle, handle.unwrap(SmbPipeHandle.class), "unwrap should return same instance for interface type");
    }

    @ParameterizedTest
    @DisplayName("getPipeType echoes constructor input (edge values)")

        }

        @Test
        @DisplayName("Should handle null file ID in setter")
        void testSetNullFileId() {
            assertDoesNotThrow(() -> request.setFileId(null));
        }

        @Test
        @DisplayName("Should handle various file ID sizes")
        void testVariousFileIdSizes() {
            byte[] shortFileId = new byte[8];