{!../../docs_src/bigger_applications/app/main.py!}
```

and it will work correctly, together with all the other *path operations* added with `app.include_router()`.

/// info | Very Technical Details

**Note**: this is a very technical detail that you probably can **just skip**.

---

The `APIRouter`s are not "mounted", they are not isolated from the rest of the application.

   * thus a motivated caller may be able to expose the reference to another thread that would then
   * call cancel() and be unable to cancel the delegate.
   * There are a number of ways to solve this, none of which are very pretty, and it is currently
   * believed to be a purely theoretical problem (since the other actions should supply sufficient
   * write-barriers).
   */

  @LazyInit private @Nullable ListenableFuture<V> delegateRef;

        assertEquals("short", result);
    }

    @Test
    void testReadStringWithMaxLengthExceeded() {
        smb.useUnicode = false;
        byte[] buffer = "a very long string that exceeds max length".getBytes();
        assertThrows(RuntimeException.class, () -> {
            smb.readString(buffer, 0, 10, false);
        });
    }

    @Test
    void testEncodeDecode() {

        Smb2LeaseKey key = leaseManager.requestLease(path, requestedState);
        assertNotNull(leaseManager.getLease(key));

        // Wait a bit and then cleanup with a very short expiration time
        Thread.sleep(10);
        int cleaned = leaseManager.cleanupExpiredLeases(1); // 1ms expiration

        assertEquals(1, cleaned);
        assertNull(leaseManager.getLease(key));
    }

You can also read more about them in the <a href="https://en.wikipedia.org/wiki/Environment_variable" class="external-link" target="_blank">Wikipedia for Environment Variable</a>.

In many cases it's not very obvious how environment variables would be useful and applicable right away. But they keep showing up in many different scenarios when you are developing, so it's good to know about them.

The steps below show how to use this notification target in `namespace` format. The other format is very similar and is omitted for brevity.

### Step 1: Ensure Elasticsearch minimum requirements are met

            sb.setLength(0); // Reset length
        }
        return sb;
    }

    private void returnStringBuilder(StringBuilder sb) {
        if (sb != null && sb.capacity() < 2048) { // Avoid keeping very large builders
            stringBuilderPool.offer(sb);
        }
    }

    private Map<String, Object> getContextMap() {
        HashMap<String, Object> map = mapPool.poll();
        if (map == null) {

    }

    public void test_convertPhraseQuery_longPhrase() {
        // Test with long phrase (many terms)
        PhraseQuery.Builder builder = new PhraseQuery.Builder();
        String[] words = { "this", "is", "a", "very", "long", "phrase", "query" };
        for (String word : words) {
            builder.add(new Term(Constants.DEFAULT_FIELD, word));
        }
        PhraseQuery phraseQuery = builder.build();

        assertEquals(engine1, scriptEngineFactory.getScriptEngine("name1"));
        assertEquals(engine2, scriptEngineFactory.getScriptEngine("name2"));
    }

    // Test with engine that has very long class name
    public void test_add_longClassName() {
        VeryLongClassNameScriptEngineImplementation engine = new VeryLongClassNameScriptEngineImplementation();
        scriptEngineFactory.add("short", engine);

        Supplier<Object> supplier = () -> "";

        monitorTarget.append(buf, "emptyKey", supplier);
        assertEquals("\"emptyKey\":\"\"", buf.toString());
    }

    // Test append with very long string
    public void test_append_veryLongString() {
        StringBuilder buf = new StringBuilder();
        String longString = "a".repeat(10000);
        Supplier<Object> supplier = () -> longString;