{!../../docs_src/app_testing/test_main.py!}
```

...and have the code for the tests just like before.

## Testing: extended example

Now let's extend this example and add more details to see how to test different parts.

### Extended **FastAPI** app file

Let's continue with the same file structure as before:

```
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

	l.LDAP.UserDNSearchFilter = getCfgVal(UserDNSearchFilter)
	l.LDAP.UserDNSearchBaseDistName = getCfgVal(UserDNSearchBaseDN)
	l.LDAP.UserDNAttributes = getCfgVal(UserDNAttributes)

	// Group search params configuration
	l.LDAP.GroupSearchFilter = getCfgVal(GroupSearchFilter)
	l.LDAP.GroupSearchBaseDistName = getCfgVal(GroupSearchBaseDN)

	// If enable flag was not explicitly set, we treat it as implicitly set at

# Simple OAuth2 with Password and Bearer

Now let's build from the previous chapter and add the missing parts to have a complete security flow.

## Get the `username` and `password`

We are going to use **FastAPI** security utilities to get the `username` and `password`.

OAuth2 specifies that when using the "password flow" (that we are using) the client/user must send a `username` and `password` fields as form data.

    if (IPV4_DELIMITER_MATCHER.countIn(ipString) + 1 != IPV4_PART_COUNT) {
      return null; // Wrong number of parts
    }

    byte[] bytes = new byte[IPV4_PART_COUNT];
    int start = 0;
    // Iterate through the parts of the ip string.
    // Invariant: start is always the beginning of an octet.
    for (int i = 0; i < IPV4_PART_COUNT; i++) {

///

## Без Pydantic

///

## Ohne Pydantic

因为默认值是 `None`， FastAPI 会把 `q` 当作可选参数。

FastAPI 不使用 `Optional[str]` 中的 `Optional`， 但 `Optional` 可以让编辑器提供更好的支持，并检测错误。

///

## 不使用 Pydantic

///

## Sem o Pydantic

You can use a policy variable in the Resource element, but only in the resource portion of the ARN. This portion of the ARN appears after the 5th colon (:). You can't use a variable to replace parts of the ARN before the 5th colon, such as the service or account. The following policy might be attached to a group. It gives each of the users in the group full programmatic access to a user-specific object (their own "home directory") in MinIO.

    SQLModel.metadata.clear()
    # Clear the Models associated with the registry, to avoid warnings
    default_registry.dispose()


@pytest.fixture(
    name="client",
    params=[
        "tutorial002",
        pytest.param("tutorial002_py39", marks=needs_py39),
        pytest.param("tutorial002_py310", marks=needs_py310),
        "tutorial002_an",