{mustIP("10.0.0.1"), 32},
		{mustIP("::"), 128},
		{mustIP("fed0::1"), 128},
		{mustIP("::ffff:10.0.0.1"), 128},
	}
	for _, tt := range tests {
		got := tt.ip.BitLen()
		if got != tt.want {
			t.Errorf("BitLen(%v) = %d; want %d", tt.ip, got, tt.want)
		}
	}
}

func TestPrefixContains(t *testing.T) {
	tests := []struct {
		ipp  Prefix
		ip   Addr
		want bool
	}{

## Зависимости для групп *операций пути*

```

[*路径装饰器依赖项*](dependencies-in-path-operation-decorators.md){.internal-link target=_blank} 一章的思路均适用于全局依赖项， 在本例中，这些依赖项可以用于应用中的所有*路径操作*。

## 为一组路径操作定义依赖项

	// maxBufferSize is the maximum buffer size.
	// Buffers larger than this is not reused.
	maxBufferSize = 96 << 10

	// This is the assumed size of bigger buffers and allocation size.
	biggerBufMin = 32 << 10

	// This is the maximum size of bigger buffers.
	biggerBufMax = maxBufferSize

	// If there is a queue, merge up to this many messages.
	maxMergeMessages = 30

つまり、すでにどこかで使っている通常の依存関係（値を返すもの）を再利用することができ、値は使われなくても依存関係は実行されます:

```Python hl_lines="9 14"
{!../../../docs_src/dependencies/tutorial006.py!}
```

## *path operations*のグループに対する依存関係

	} else {
		pcert = tmpl
		pkey = key
	}

	var pub interface{}
	var desc string
	switch k := key.(type) {
	case *rsa.PrivateKey:
		pub = &k.PublicKey
		desc = fmt.Sprintf("RSA-%d", k.N.BitLen())
	case *ecdsa.PrivateKey:
		pub = &k.PublicKey
		desc = "ECDSA-" + k.Curve.Params().Name
	default:
		t.Fatalf("invalid key %T", key)
	}

	// For bigInt, we use a value that's too big for an int64, but still
	// fits in uint64. go/constant uses a different representation for
	// values larger than int64, but the cmd/asm parser can't parse
	// anything bigger than a uint64.
	bigInt = 0xffffffffffffffff

	stringVal = "test"

	longStringVal = "this_is_a_string_constant_longer_than_seventy_characters_which_used_to_fail_see_issue_50253"
)

var (
	smallIntAsm   int64

## Example

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md){.internal-link target=_blank} and [Testing](../tutorial/testing.md){.internal-link target=_blank}:

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

	fmt.Printf("%s\n", buf)

	// buffer smaller than minimal read size.
	shortBuf := make([]byte, 3)
	if _, err := io.ReadAtLeast(r, shortBuf, 4); err != nil {
		fmt.Println("error:", err)
	}

	// minimal read size bigger than io.Reader stream
	longBuf := make([]byte, 64)
	if _, err := io.ReadAtLeast(r, longBuf, 64); err != nil {
		fmt.Println("error:", err)
	}

	// Output:
	// some io.Reader
	// error: short buffer

	amount := big.NewInt(0).Set(mantissa)
	// move all factors of 10 into the exponent for easy reasoning
	amount, times := removeBigIntFactors(amount, bigTen)
	exponent += times

	// make sure exponent is a multiple of 3
	for exponent%3 != 0 {
		amount.Mul(amount, bigTen)
		exponent--
	}

	return append(out, amount.String()...), exponent
}