}

    public void test_generate_withInvalidOutputPath() throws IOException {
        // Test generation with non-writable output file
        File readOnlyDir = Files.createTempDirectory(tempDir, "readonly").toFile();
        readOnlyDir.setWritable(false);
        File invalidOutputFile = new File(readOnlyDir, "thumbnail.png");

        String thumbnailId = "test-thumbnail-003";

   * @see FileChannel#map(MapMode, long, long)
   * @since 2.0
   */
  public static MappedByteBuffer map(File file) throws IOException {
    checkNotNull(file);
    return map(file, MapMode.READ_ONLY);
  }

  /**
   * Fully maps a file in to memory as per {@link
   * FileChannel#map(java.nio.channels.FileChannel.MapMode, long, long)} using the requested {@link
   * MapMode}.
   *

   *
   * <p><b>Performance note:</b> When feasible, {@code initialCapacity} should be the exact number
   * of values that will be added, if that knowledge is readily available. It is better to guess a
   * value slightly too high than slightly too low. If the value is not exact, the {@link
   * ImmutableLongArray} that is built will very likely occupy more memory than strictly necessary;

   *
   * <p><b>Performance note:</b> When feasible, {@code initialCapacity} should be the exact number
   * of values that will be added, if that knowledge is readily available. It is better to guess a
   * value slightly too high than slightly too low. If the value is not exact, the {@link
   * ImmutableIntArray} that is built will very likely occupy more memory than strictly necessary;

   * @see FileChannel#map(MapMode, long, long)
   * @since 2.0
   */
  public static MappedByteBuffer map(File file) throws IOException {
    checkNotNull(file);
    return map(file, MapMode.READ_ONLY);
  }

  /**
   * Fully maps a file in to memory as per {@link
   * FileChannel#map(java.nio.channels.FileChannel.MapMode, long, long)} using the requested {@link
   * MapMode}.
   *