private static SingletonContext INSTANCE;

    /**
     * Initialize singleton context using custom properties
     *
     * This method can only be called once.
     *
     * @param props the properties to use for initialization
     * @throws CIFSException if the singleton context is already initialized or there is an error during initialization
     */

    static class TestSigningDigest extends SigningDigest {
        boolean called;
        int lastLength;

        TestSigningDigest() throws SmbException {
            super(new byte[16], false);
        }

        @Override
        void sign(byte[] data, int offset, int length, ServerMessageBlock request, ServerMessageBlock response) {
            called = true;
            lastLength = length;
        }
    }

But by following the steps above, it will be able to do some performance optimizations.

## Technical Details { #technical-details }

Modern versions of Python have support for **"asynchronous code"** using something called **"coroutines"**, with **`async` and `await`** syntax.

Let's see that phrase by parts in the sections below:

* **Asynchronous Code**
* **`async` and `await`**
* **Coroutines**

        try (SamrPolicyHandle handle = new SamrPolicyHandle(mockHandle, server, access)) {
            assertNotNull(handle);
            // Verify that sendrecv was called with MsrpcSamrConnect4
            verify(mockHandle, times(1)).sendrecv(any(MsrpcSamrConnect4.class));
            verify(mockHandle, never()).sendrecv(any(MsrpcSamrConnect2.class));
        }
    }

    @Test

 *
 * <p>{@code ByteSink} provides two kinds of methods:
 *
 * <ul>
 *   <li><b>Methods that return a stream:</b> These methods should return a <i>new</i>, independent
 *       instance each time they are called. The caller is responsible for ensuring that the
 *       returned stream is closed.
 *   <li><b>Convenience methods:</b> These are implementations of common operations that are

 *
 * <p>{@code ByteSink} provides two kinds of methods:
 *
 * <ul>
 *   <li><b>Methods that return a stream:</b> These methods should return a <i>new</i>, independent
 *       instance each time they are called. The caller is responsible for ensuring that the
 *       returned stream is closed.
 *   <li><b>Convenience methods:</b> These are implementations of common operations that are

   *     can <i>usually</i> still preserve behavior by passing an explicit {@code null} cause. Note,
   *     however, that passing an explicit {@code null} cause prevents anyone from calling {@link
   *     #initCause} later, so it is not quite equivalent to using a constructor that omits the
   *     cause.
   */
  @Deprecated
  protected ExecutionError() {}

  /**

   *     can <i>usually</i> still preserve behavior by passing an explicit {@code null} cause. Note,
   *     however, that passing an explicit {@code null} cause prevents anyone from calling {@link
   *     #initCause} later, so it is not quite equivalent to using a constructor that omits the
   *     cause.
   */
  @Deprecated
  protected ExecutionError() {}

  /**

    connections that were allocated but never released, and will enforce HTTP/2
    stream limits. This update also fixes `Call.cancel()` to not do I/O on the
    calling thread.
 *  Fix: Don't log gzipped data in the logging interceptor.
 *  Fix: Don't resolve DNS addresses when connecting through a SOCKS proxy.
 *  Fix: Drop the synthetic `OkHttp-Selected-Protocol` response header.

 *
 * <p>If your iterator supports modification through {@code remove()}, you may wish to override the
 * verify() method, which is called after each sequence and is guaranteed to be called
 * using the latest values obtained from {@link IteratorTester#newTargetIterator()}.
 *
 * <p>The value you pass to the parameter {@code steps} should be greater than the length of your