EnumBiMap<Currency, Country> bimap2 = EnumBiMap.create(bimap1);
    assertEquals(Country.CANADA, bimap2.get(Currency.DOLLAR));
    assertEquals(bimap1, bimap2);
    bimap2.inverse().put(Country.SWITZERLAND, Currency.FRANC);
    assertEquals(Country.SWITZERLAND, bimap2.get(Currency.FRANC));
    assertNull(bimap1.get(Currency.FRANC));
    assertFalse(bimap2.equals(bimap1));

    /* Test that it can be empty. */

    switch (end - start) {
      case 0:
        return BigInteger.ONE;
      case 1:
        return nums.get(start);
      case 2:
        return nums.get(start).multiply(nums.get(start + 1));
      case 3:
        return nums.get(start).multiply(nums.get(start + 1)).multiply(nums.get(start + 2));
      default:
        // Otherwise, split the list in half and recursively do this.

우리 역시 이제부터 메소드를 "**작동**"이라고 부를 것입니다.

#### *경로 작동 데코레이터* 정의

{* ../../docs_src/first_steps/tutorial001.py hl[6] *}

`@app.get("/")`은 **FastAPI**에게 바로 아래에 있는 함수가 다음으로 이동하는 요청을 처리한다는 것을 알려줍니다.

* 경로 `/`
* <abbr title="HTTP GET 메소드"><code>get</code> 작동</abbr> 사용

/// info | `@decorator` 정보

이 `@something` 문법은 파이썬에서 "데코레이터"라 부릅니다.

{* ../../docs_src/first_steps/tutorial001.py h1[6] *}

`@app.get("/")` 告訴 **FastAPI** 那個函式負責處理請求：

* 路徑 `/`
* 使用 <abbr title="HTTP GET 方法"><code>get</code>操作</abbr>

/// info | `@decorator` Info

Python 中的 `@something` 語法被稱為「裝飾器」。

你把它放在一個函式上面。像一個漂亮的裝飾帽子（我猜這是術語的來源）。

一個「裝飾器」會對下面的函式做一些事情。

在這種情況下，這個裝飾器告訴 **FastAPI** 那個函式對應於 **路徑** `/` 和 **操作** `get`.

這就是「**路徑操作裝飾器**」。

///

你也可以使用其他的操作：

        assertTrue(execJob.jvmOptions.get(0).startsWith("-Xlog:gc*,gc+age=trace,safepoint:file="));
        assertTrue(execJob.jvmOptions.get(0).contains("gc-test.log"));

        // Test with custom logFilePath
        execJob.jvmOptions.clear();
        execJob.logFilePath("/custom/path");
        result = execJob.gcLogging();
        assertTrue(execJob.jvmOptions.get(0).contains("/custom/path"));
    }

  }

  @Test
  fun testPlatform() {
    assertTrue(Platform.isAndroid)

    if (Build.VERSION.SDK_INT >= 29) {
      assertTrue(Platform.get() is Android10Platform)
    } else {
      assertTrue(Platform.get() is AndroidPlatform)
    }
  }

  @Test
  fun testRequest() {
    assumeNetwork()

          }
        };
    List<Future<Boolean>> futureList = executor.invokeAll(ImmutableList.of(task), 10, MILLISECONDS);
    Future<Boolean> future = futureList.get(0);
    assertFalse(taskDone);
    assertTrue(future.isDone());
    assertThrows(CancellationException.class, () -> future.get());
  }

  public void testSameThreadScheduledExecutor() throws ExecutionException, InterruptedException {
    taskDone = false;
    Callable<Integer> task =

          }
        };
    List<Future<Boolean>> futureList = executor.invokeAll(ImmutableList.of(task), 10, MILLISECONDS);
    Future<Boolean> future = futureList.get(0);
    assertFalse(taskDone);
    assertTrue(future.isDone());
    assertThrows(CancellationException.class, () -> future.get());
  }

  public void testSameThreadScheduledExecutor() throws ExecutionException, InterruptedException {
    taskDone = false;
    Callable<Integer> task =

    return (Optional<T>) INSTANCE;
  }

  private Absent() {}

  @Override
  public boolean isPresent() {
    return false;
  }

  @Override
  public T get() {
    throw new IllegalStateException("Optional.get() cannot be called on an absent value");
  }

  @Override
  public T or(T defaultValue) {
    return checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
  }

        }

        @Test
        @DisplayName("Should get share")
        void testGetShare() {
            assertNull(referralData.getShare());
        }

        @Test
        @DisplayName("Should get path")
        void testGetPath() {
            assertNull(referralData.getPath());
        }

        @Test
        @DisplayName("Should get expiration")
        void testGetExpiration() {