assertThrows(IllegalArgumentException.class, () -> multimap.put(Color.BLUE, -1));
    multimap.put(Color.RED, 1);
    multimap.put(Color.BLUE, 2);
    assertThrows(IllegalArgumentException.class, () -> multimap.put(Color.GREEN, -1));
    assertThat(multimap.entries())
        .containsExactly(Maps.immutableEntry(Color.RED, 1), Maps.immutableEntry(Color.BLUE, 2));
  }

  public void testNewMultimap() {

                                "schema": {}
                            }
                        }
                    }
                },
                "x-aperture-labs-portal": "blue"
            }
        }
    }
}
```

### 사용자 정의 OpenAPI *경로 처리* 스키마 { #custom-openapi-path-operation-schema }

`openapi_extra`의 딕셔너리는 *경로 처리*에 대해 자동으로 생성된 OpenAPI 스키마와 깊게 병합됩니다.

     */
    public enum Color {
        BLACK(0, "BLACK"),
        RED(1, "RED"),
        GREEN(2, "GREEN"),
        YELLOW(3, "YELLOW"),
        BLUE(4, "BLUE"),
        MAGENTA(5, "MAGENTA"),
        CYAN(6, "CYAN"),
        WHITE(7, "WHITE"),
        DEFAULT(9, "DEFAULT");

        private final int value;
        private final String name;

                                "schema": {}
                            }
                        }
                    }
                },
                "x-aperture-labs-portal": "blue"
            }
        }
    }
}
```

### 自訂 OpenAPI 路徑操作結構 { #custom-openapi-path-operation-schema }

`openapi_extra` 中的字典會與自動產生的該*路徑操作*之 OpenAPI 結構進行深度合併。

因此你可以在自動產生的結構上加入額外資料。

    ImmutableSet.Builder<Integer> webSafeColorsBuilder = this.<Integer>builder();
    for (Integer red : colorElem) {
      for (Integer green : colorElem) {
        for (Integer blue : colorElem) {
          webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
        }
      }
    }
    ImmutableSet<Integer> webSafeColors = webSafeColorsBuilder.build();
    assertEquals(216, webSafeColors.size());

        return style("." + Constants.MAVEN_STYLE_DEBUG_NAME + ":-" + Constants.MAVEN_STYLE_DEBUG_DEFAULT, message);
    }

    /**
     * Append message content in info style.
     * By default, bold blue
     *
     * @param message the message to append
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder info(Object message) {

    ImmutableList.Builder<Integer> webSafeColorsBuilder = ImmutableList.builder();
    for (Integer red : colorElem) {
      for (Integer green : colorElem) {
        for (Integer blue : colorElem) {
          webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
        }
      }
    }
    ImmutableList<Integer> webSafeColors = webSafeColorsBuilder.build();
    assertEquals(216, webSafeColors.size());

                                "schema": {}
                            }
                        }
                    }
                },
                "x-aperture-labs-portal": "blue"
            }
        }
    }
}
```

### Custom OpenAPI *path operation* schema { #custom-openapi-path-operation-schema }

    # Create a simple SVG test file
    SVG_TEST="${OUTPUT_DIR}/test.svg"
    cat > "${SVG_TEST}" << 'EOF'
<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
  <rect width="200" height="200" fill="blue"/>
  <circle cx="100" cy="100" r="80" fill="red"/>
</svg>
EOF

    # Test: SVG thumbnail generation
    run_file_test "SVG thumbnail" "${OUTPUT_DIR}/svg_thumb.png" \

    ImmutableList.Builder<Integer> webSafeColorsBuilder = ImmutableList.builder();
    for (Integer red : colorElem) {
      for (Integer green : colorElem) {
        for (Integer blue : colorElem) {
          webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
        }
      }
    }
    ImmutableList<Integer> webSafeColors = webSafeColorsBuilder.build();
    assertEquals(216, webSafeColors.size());