from fastapi import FastAPI, File
from fastapi.testclient import TestClient

app = FastAPI()


@app.post("/files")
async def upload_files(files: list[bytes] | None = File(None)):
    if files is None:
        return {"files_count": 0}
    return {"files_count": len(files), "sizes": [len(f) for f in files]}


def test_optional_bytes_list():
    client = TestClient(app)
    response = client.post(
        "/files",

The `fastapi` CLI will try to detect automatically the FastAPI app to run, assuming it's an object called `app` in a file `main.py` (or a couple other variants).

But you can configure explicitly the app to use.

## Configure the app `entrypoint` in `pyproject.toml` { #configure-the-app-entrypoint-in-pyproject-toml }

You can configure where your app is located in a `pyproject.toml` file like:

```toml
[tool.fastapi]

        final String varPath = System.getProperty(FESS_VAR_PATH);
        if (varPath != null) {
            tomcatBoot.atBaseDir(new File(varPath, "webapp").getAbsolutePath());
        } else if (tempPath != null) {
            tomcatBoot.atBaseDir(new File(tempPath, "webapp").getAbsolutePath());
        }
        final String tomcatConfigPath = getTomcatConfigPath();
        if (tomcatConfigPath != null) {

import org.junit.jupiter.api.Test
import java.io.File

class PerformanceTestBuildTypeTest {
    init {
        DslContext.initForTest()
    }

    private val buildModel =
        CIBuildModel(
            projectId = "Gradle_Check",
            branch = VersionedSettingsBranch("master"),
            buildScanTags = listOf("Check"),
            subprojects = JsonBasedGradleSubprojectProvider(File("../.teamcity/subprojects.json")),
        )

            if (f == null) {
                throw new NullPointerException("file must not be null");
            }
            return true; // not reached in this test
        };

        // Act + Assert
        NullPointerException npe = assertThrows(NullPointerException.class, () -> filter.accept(null));
        assertEquals("file must not be null", npe.getMessage());
    }

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *