The exception handler will receive a `Request` and the exception.

```Python hl_lines="2  14-16"
{!../../docs_src/handling_errors/tutorial004.py!}
```

Now, if you go to `/items/foo`, instead of getting the default JSON error with:

```JSON
{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],

module gorm.io/gorm/tests

go 1.18

require (
	github.com/google/uuid v1.6.0
	github.com/jinzhu/now v1.1.5
	github.com/lib/pq v1.10.9
	github.com/stretchr/testify v1.9.0
	gorm.io/driver/mysql v1.5.7
	gorm.io/driver/postgres v1.5.9
	gorm.io/driver/sqlite v1.5.6
	gorm.io/driver/sqlserver v1.5.3
	gorm.io/gorm v1.25.12
)

require (
	filippo.io/edwards25519 v1.1.0 // indirect
	github.com/davecgh/go-spew v1.1.1 // indirect

	if p.Pools[idx].Decommission == nil {
		return false, errInvalidArgument
	}
	now := UTCNow()
	if now.Sub(p.Pools[idx].LastUpdate) >= duration {
		if serverDebugLog {
			console.Debugf("decommission: persisting poolMeta on drive: threshold:%s, poolMeta:%#v\n", now.Sub(p.Pools[idx].LastUpdate), p.Pools[idx])
		}
		p.Pools[idx].LastUpdate = now
		if err := p.save(ctx, pools); err != nil {
			return false, err
		}

 */
package org.codelibs.core.misc;

import junit.framework.TestCase;

/**
 * @author higa
 *
 */
public class Base64UtilTest extends TestCase {

    private static final String ORIGINAL = "how now brown cow\r\n";

    private static final byte[] BINARY_DATA = ORIGINAL.getBytes();

    private static final String ENCODED_DATA = "aG93IG5vdyBicm93biBjb3cNCg==";

    /**
     * @throws Exception
     */

## 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
```

func (l *Config) GetConfigList(s config.Config) ([]madmin.IDPListItem, error) {
	ldapConfigs, err := s.GetAvailableTargets(config.IdentityLDAPSubSys)
	if err != nil {
		return nil, err
	}

	// For now, ldapConfigs will only have a single entry for the default
	// configuration.

	var res []madmin.IDPListItem
	for _, cfg := range ldapConfigs {
		res = append(res, madmin.IDPListItem{
			Type:    "ldap",

package tests_test

import (
	"database/sql"
	"encoding/json"
	"errors"
	"regexp"
	"testing"

	"github.com/jinzhu/now"
	"gorm.io/gorm"
	. "gorm.io/gorm/utils/tests"
)

func TestSoftDelete(t *testing.T) {
	user := *GetUser("SoftDelete", Config{})
	DB.Save(&user)

	var count int64
	var age uint

	if DB.Model(&User{}).Where("name = ?", user.Name).Count(&count).Error != nil || count != 1 {

            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var client_id = Date.now()
            document.querySelector("#ws-id").textContent = client_id;
            var ws = new WebSocket(`ws://localhost:8000/ws/${client_id}`);
            ws.onmessage = function(event) {

package mountinfo

import (
	"path/filepath"
	"sync"

	"golang.org/x/sys/windows"
)

// CheckCrossDevice - check if any input path has multiple sub-mounts.
// this is a dummy function and returns nil for now.
func CheckCrossDevice(paths []string) error {
	return nil
}

// mountPointCache contains results of IsLikelyMountPoint
var mountPointCache sync.Map

// IsLikelyMountPoint determines if a directory is a mountpoint.

# Note: in awk, "print $N" prints the Nth "field", where fields are strings separated
# by whitespace. The flag "-F<x>" changes the behavior such that fields are now strings
# separated by the character <x>. Therefore, -F\' (escaped single quote) means that field
# $2 in <Tensor'flow'> is <flow>. This is useful for reading string literals like below.