// Test constructor with null message
        ThumbnailGenerationException exception = new ThumbnailGenerationException(null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void test_constructorWithNullMessageAndCause() {
        // Test constructor with null message and null cause
        ThumbnailGenerationException exception = new ThumbnailGenerationException(null, null);

                    if (logger.isDebugEnabled()) {
                        throw new ThumbnailGenerationException("Failed to process a thumbnail content: " + url, e);
                    }
                    throw new ThumbnailGenerationException(e.getMessage());
                } catch (final Exception e) {
                    throw new ThumbnailGenerationException("Failed to process a thumbnail content: " + url, e);
                }
            }