* Even dependencies can have dependencies, creating a hierarchy or **"graph" of dependencies**.
* All **automatically handled** by the framework.
* All the dependencies can require data from requests and **augment the path operation** constraints and automatic documentation.
* **Automatic validation** even for *path operation* parameters defined in dependencies.

  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-annotations</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-xml</artifactId>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>

  <artifactId>t07-c</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t07-d</artifactId>
      <version>1.1</version>
      <type>jar</type>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
  </dependencies>

            ),
        ] = None,
        dependencies: Annotated[
            Optional[Sequence[Depends]],
            Doc(
                """
                A list of global dependencies, they will be applied to each
                *path operation*, including in sub-routers.

                Read more about it in the

        List<MavenProject> dependenciesC = graph.getDependencies(ProjectDependencyGraphStub.C);
        // C depends only on A
        assertEquals(1, dependenciesC.size());

        List<MavenProject> dependenciesX = graph.getDependencies(ProjectDependencyGraphStub.X);
        // X depends only on B and C
        assertEquals(2, dependenciesX.size());

## Create a `get_current_user` dependency { #create-a-get-current-user-dependency }

Let's create a dependency `get_current_user`.

Remember that dependencies can have sub-dependencies?

`get_current_user` will have a dependency with the same `oauth2_scheme` we created before.

    <module>maven-repository-mercury</module>
  </modules>
  <!--start-->
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junitVersion}</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <dependencyManagement>
    <!--end-->
    <dependencies>
      <!--  Maven Modules -->
      <!--start-->
      <dependency>

      - name: Install build dependencies
        run: pip install build
      - name: Build source distribution
        env:
          TIANGOLO_BUILD_PACKAGE: ${{ matrix.package }}
        run: python -m build --sdist
      - name: Decompress source distribution
        run: |
          cd dist
          tar xvf fastapi*.tar.gz
      - name: Install test dependencies
        run: |
          cd dist/fastapi*/

      <url>file://dummy</url>
    </repository>
  </repositories>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t08-b</artifactId>
      <version>1.0</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

from unittest.mock import Mock, patch

from docs_src.dependencies.tutorial007_py39 import get_db


def test_get_db():  # Just for coverage
    async def test_async_gen():
        cm = asynccontextmanager(get_db)
        async with cm() as db_session:
            return db_session

    dbsession_moock = Mock()

    with patch(
        "docs_src.dependencies.tutorial007_py39.DBSession",
        return_value=dbsession_moock,