assertNotNull(resumeKey, "Resume key should not be null");
        assertEquals(24, resumeKey.length, "Resume key should be 24 bytes");

        // Verify first 24 bytes were copied
        for (int i = 0; i < 24; i++) {
            assertEquals((byte) (i % 256), resumeKey[i], "Resume key byte " + i + " should match buffer");
        }
    }

    @Test

        // Verify
        assertEquals(3, includePatterns.size());
        assertEquals(3, excludePatterns.size());

        // Verify all calls were made
        verify(dataHelper).addIncludeUrlPattern(sessionId, "https://example.com/.*");
        verify(dataHelper).addIncludeUrlPattern(sessionId, "https://test.com/.*");

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

But then we get a `dict` in the parameter `commons` of the *path operation function*.

      Iterator<T> iterator = targetList.iterator();
      return peekingIterator(iterator);
    }

    @Override
    protected void verify(List<T> elements) {
      // verify same objects were removed from reference and target
      assertEquals(elements, targetList);
    }
  }

  private <T extends @Nullable Object> void actsLikeIteratorHelper(List<T> list) {
    // Check with modifiable copies of the list

     */
    @Required
    @Min(-1)
    @Max(10000)
    @ValidateTypeFailure
    public Integer failureCountThreshold;

    /**
     * Enable or disable popular word tracking and display.
     * When enabled, frequently searched terms are tracked and displayed.
     */
    @Size(max = 10)
    public String popularWord;

    /**

Because this code is executed before the application **starts** taking requests, and right after it **finishes** handling requests, it covers the whole application **lifespan** (the word "lifespan" will be important in a second 😉).

     * @return the username
     */
    public String getUsername() {
        return username;
    }

    /**
     * Returns the password in plain text or {@code null} if the raw password
     * hashes were used to construct this {@code NtlmPasswordAuthentication}
     * object which will be the case when NTLM HTTP Authentication is
     * used. There is no way to retrieve a users password in plain text unless

 * <i>type</i> offering meaningful behavioral guarantees. This is substantially different from the
 * case of (say) {@link HashSet}, which is an <i>implementation</i>, with semantics that were
 * largely defined by its supertype.
 *
 * <p>For field types and method return types, you should generally use the immutable type (such as

                # strictly necessary for closing files but it was one of the original
                # intentions.
                # If the AsyncExitStack lived outside of the custom middlewares and
                # contextvars were set, for example in a dependency with 'yield'
                # in that internal contextvars context, the values would not be
                # available in the outer context of the AsyncExitStack.

// asciiSet is a 32-byte value, where each bit represents the presence of a
// given ASCII character in the set. The 128-bits of the lower 16 bytes,
// starting with the least-significant bit of the lowest word to the
// most-significant bit of the highest word, map to the full range of all
// 128 ASCII characters. The 128-bits of the upper 16 bytes will be zeroed,
// ensuring that any non-ASCII character will be reported as not in the set.