if (testFileTree.isPresent() && mainFileTree.isPresent()) {
            return testFileTree.get().plus(mainFileTree.get()).matching(filter);
        } else if (mainFileTree.isPresent()) {
            return mainFileTree.get().matching(filter);
        } else if (testFileTree.isPresent()) {
            return testFileTree.get().matching(filter);
        }
        return null;
    }

    /**

    N nodeU = edgeToReferenceNode.get(edge);
    if (nodeU == null) {
      return false;
    }

    // requireNonNull is safe because of the edgeToReferenceNode check above.
    NetworkConnections<N, E> connectionsU = requireNonNull(nodeConnections.get(nodeU));
    N nodeV = connectionsU.adjacentNode(edge);
    NetworkConnections<N, E> connectionsV = requireNonNull(nodeConnections.get(nodeV));
    connectionsU.removeOutEdge(edge);

    sort(entries, Helpers.entryComparator(navigableMap.comparator()));

    // some tests assume SEVERAL == 3
    if (entries.size() >= 1) {
      a = entries.get(0);
      if (entries.size() >= 3) {
        c = entries.get(2);
      }
    }
  }

  @CollectionSize.Require(ZERO)
  public void testEmptyMapFirst() {
    assertThrows(NoSuchElementException.class, () -> navigableMap.firstKey());
  }

    }

    /**
     * Get an MD4 message digest instance.
     * @return MD4 digest instance
     */
    public static MessageDigest getMD4() {
        try {
            return MessageDigest.getInstance("MD4", getProvider());
        } catch (final NoSuchAlgorithmException e) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }

    /**
     * Get an MD5 message digest instance.

// TODO plugins that need downloading
// TODO project dependencies that need downloading
// TODO unfortunately the plugins need to be downloaded in order to get the plugin.xml file. need to externalize this
//      from the plugin archive.
// TODO this will be the class that people get in IDEs to modify

/**
 * MavenExecutionPlan
 */
public class MavenExecutionPlan implements Iterable<ExecutionPlanItem> {

    /*

import okhttp3.buildsupport.testJavaVersion

plugins {
  id("okhttp.base-conventions")
}

val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")

fun library(alias: String) = libs.findLibrary(alias).get().get().let {
  "${it.module.group}:${it.module.name}:${it.versionConstraint.requiredVersion}"
}


val testRuntimeOnly = configurations.maybeCreate("testRuntimeOnly")
dependencies {

swagger_ui_oauth2_redirect_url = "/docs/redirect"

app = FastAPI(swagger_ui_oauth2_redirect_url=swagger_ui_oauth2_redirect_url)


@app.get("/items/")
async def read_items():
    return {"id": "foo"}


client = TestClient(app)


def test_swagger_ui():
    response = client.get("/docs")
    assert response.status_code == 200, response.text
    assert response.headers["content-type"] == "text/html; charset=utf-8"

    app = FastAPI()

    @app.get("/facilities/{facility_id}")
    def get_facility(facility_id: str) -> Facility:
        return Facility(
            id=facility_id,
            address=Address(line_1="123 Main St", city="Anytown", state_province="CA"),
        )

    client = TestClient(app)
    return client


def test_get(client: TestClient):
    response = client.get("/facilities/42")

    @Override
    protected int execute(LookupContext context) throws Exception {
        // set up JLine built-in commands
        ConfigurationPath configPath = new ConfigurationPath(context.cwd.get(), context.cwd.get());
        Builtins builtins = new Builtins(context.cwd, configPath, null);
        builtins.rename(Builtins.Command.TTOP, "top");
        builtins.alias("zle", "widget");
        builtins.alias("bindkey", "keymap");

    return True


@app.get("/users/{user_id}", dependencies=[Depends(user_exists)])
async def read_users(user_id: int):
    pass


client = TestClient(app)


def test_read_users():
    response = client.get("/users/42")
    assert response.status_code == 200, response.text


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.json() == snapshot(