## Install `PyJWT` { #install-pyjwt }

We need to install `PyJWT` to generate and verify the JWT tokens in Python.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install `pyjwt`:

<div class="termy">

```console
$ pip install pyjwt

 *
 * from igor: two plugins A and B, both depend on the same library but use different versions, say
 * lib 1.0 and lib 2.0 when debugger hits a breakpoint inside a class from the library, IDE needs to
 * know which version of library the class comes from
 */

import assertk.assertions.isSameAs
import okhttp3.CipherSuite.Companion.forJavaName
import okhttp3.internal.applyConnectionSpec
import org.junit.jupiter.api.Assertions.assertArrayEquals
import org.junit.jupiter.api.Test

class CipherSuiteTest {
  @Test
  fun hashCode_usesIdentityHashCode_legacyCase() {
    val cs = CipherSuite.TLS_RSA_EXPORT_WITH_RC4_40_MD5 // This one's javaName starts with "SSL_".
    assertThat(cs.hashCode(), cs.toString())

import java.util.concurrent.atomic.AtomicLong;
import org.jspecify.annotations.NullUnmarked;

/**
 * Single-threaded benchmark for {@link LoadingCache}.
 *
 * @author Charles Fry
 */
@NullUnmarked
public class LoadingCacheSingleThreadBenchmark {
  @Param({"1000", "2000"})
  int maximumSize;

  @Param("5000")
  int distinctKeys;

  @Param("4")
  int segments;

## What is "Dependency Injection" { #what-is-dependency-injection }

**"Dependency Injection"** means, in programming, that there is a way for your code (in this case, your *path operation functions*) to declare things that it requires to work and use: "dependencies".

And then, that system (in this case **FastAPI**) will take care of doing whatever is needed to provide your code with those needed dependencies ("inject" the dependencies).

import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import jcifs.CIFSContext;
import jcifs.Configuration;
import jcifs.smb.SmbFile;

/**
 * Unit tests for DirectoryLeaseManager
 */
public class DirectoryLeaseManagerTest {

    @Mock
    private CIFSContext context;

    @Mock
    private Configuration config;

    @Mock
    private LeaseManager baseLeaseManager;

    @Mock

        super.setUp();
    }

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
        // close runner
        runner.close();
        // delete all files
        runner.clean();
    }

    public void test_insert_update_deleteTx() {
        final OpenSearchUrlQueue urlQueue = new OpenSearchUrlQueue();

import okio.use
import org.junit.jupiter.api.Disabled
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.Timeout
import org.junit.jupiter.api.extension.RegisterExtension

@Timeout(30)
open class TrailersTest {
  private val fileSystem = FakeFileSystem()

  @JvmField
  @RegisterExtension
  val platform = PlatformRule()

  @RegisterExtension
  val clientTestRule = OkHttpClientTestRule()

  @StartStop

import org.mockito.junit.jupiter.MockitoExtension;

import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.util.SMBUtil;

/**
 * Test class for BasicFileInformation interface and its implementations
 */
@ExtendWith(MockitoExtension.class)
class BasicFileInformationTest {

    @Mock
    private BasicFileInformation mockBasicFileInfo;

    private FileBasicInfo fileBasicInfo;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;
import org.junit.Ignore;

/**
 * Base class for testers of classes (including {@link Collection} and {@link java.util.Map Map})
 * that contain elements.
 *
 * @param <C> the type of the container
 * @param <E> the type of the container's contents