Ein **Kontextmanager** in Python ist etwas, das Sie in einer `with`-Anweisung verwenden können, zum Beispiel kann `open()` als Kontextmanager verwendet werden:

```Python
with open("file.txt") as file:
    file.read()
```

In neueren Versionen von Python gibt es auch einen **asynchronen Kontextmanager**. Sie würden ihn mit `async with` verwenden:

```Python
async with lifespan(app):
    await do_stuff()
```

	type justWriter struct {
		io.Writer
	}
	discard := justWriter{io.Discard} // hide ReadFrom

	var with, withOut nErr
	with.n, with.err = io.Copy(discard, NewReader(nil))
	withOut.n, withOut.err = io.Copy(discard, justReader{NewReader(nil)})
	if with != withOut {
		t.Errorf("behavior differs: with = %#v; without: %#v", with, withOut)
	}
}

// tests that Len is affected by reads, but Size is not.

 * for file authentication configurations with search and display capabilities.
 */
public class FileAuthPager implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * Default constructor for file authentication pager.
     * Creates a new instance with default values.
     */
    public FileAuthPager() {
        // Default constructor
    }

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

        MsrpcShareEnum shareEnum = new MsrpcShareEnum(TEST_SERVER_NAME);
        assertNotNull(shareEnum);

        // Verify the server name is properly formatted with double backslashes
        try {
            Field servernameField = srvsvc.ShareEnumAll.class.getDeclaredField("servername");
            servernameField.setAccessible(true);

        lenient().when(configuration.getDefaultDomain()).thenReturn("TEST_DOMAIN");
    }

    /**
     * Test the init method of the servlet.
     * Verifies that servlet is correctly initialized with parameters from ServletConfig.
     * @throws ServletException
     */
    @Test
    void testInit() throws ServletException {
        assertDoesNotThrow(() -> ntlmServlet.init(servletConfig));

            return id;
        }

        /**
         * Sets the URL associated with this statistics key object.
         *
         * @param url the URL to associate with this object
         */
        public void setUrl(final String url) {
            this.url = url;
        }

        /**
         * Gets the URL associated with this statistics key object.
         *

 * href="https://github.com/ReactiveX/RxAndroid">RxAndroid</a> extension if you are building for
 * Android) or <a href="https://projectreactor.io/">Project Reactor</a>. (For the basics of
 * translating code from using an event bus to using a reactive-streams framework, see these two
 * guides: <a href="https://blog.jkl.gg/implementing-an-event-bus-with-rxjava-rxbus/">1</a>, <a

# Testing Events: lifespan and startup - shutdown { #testing-events-lifespan-and-startup-shutdown }

When you need `lifespan` to run in your tests, you can use the `TestClient` with a `with` statement:

{* ../../docs_src/app_testing/tutorial004.py hl[9:15,18,27:28,30:32,41:43] *}


You can read more details about the ["Running lifespan in tests in the official Starlette documentation site."](https://www.starlette.io/lifespan/#running-lifespan-in-tests)

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,