// Then
        assertEquals(0, bytesWritten);
    }

    @DisplayName("Should write zero bytes at various offsets")
    @ParameterizedTest
    @ValueSource(ints = { 0, 1, 10, 50, 100, 255 })
    void testWriteBytesWireFormatAtDifferentOffsets(int offset) {
        // Given
        byte[] buffer = new byte[256];

        // When

        // Verify fail counts incremented
        assertEquals(1, pool.failCounts.get("10.0.0.1"));
        assertEquals(1, pool.failCounts.get("10.0.0.2"));
    }

    @ParameterizedTest
    @ValueSource(ints = { 0, -1 })
    @DisplayName("Should default to port 445 when port <= 0")
    void testDefaultPort(int invalidPort) throws Exception {
        // Given: Create a new pool for this test to ensure isolation

        assertEquals("file3", notifications.get(2).getFileName());
    }

    @DisplayName("Should throw exception for invalid structure size")
    @ParameterizedTest
    @ValueSource(ints = { 0, 1, 2, 4, 8, 10, 16, 32, 255 })
    void testInvalidStructureSize(int structureSize) {
        // Given
        byte[] buffer = new byte[256];
        SMBUtil.writeInt2(structureSize, buffer, 0);