key8[1] = (byte) (key[0] << 7 | (key[1] & 0xFF) >>> 1);
        key8[2] = (byte) (key[1] << 6 | (key[2] & 0xFF) >>> 2);
        key8[3] = (byte) (key[2] << 5 | (key[3] & 0xFF) >>> 3);
        key8[4] = (byte) (key[3] << 4 | (key[4] & 0xFF) >>> 4);
        key8[5] = (byte) (key[4] << 3 | (key[5] & 0xFF) >>> 5);
        key8[6] = (byte) (key[5] << 2 | (key[6] & 0xFF) >>> 6);
        key8[7] = (byte) (key[6] << 1);

  }

  public void testImmutableCopy_empty() {
    assertThat(union(emptySet(), emptySet()).immutableCopy()).isEmpty();
    assertThat(intersection(newHashSet(1, 2), newHashSet(3, 4)).immutableCopy()).isEmpty();
    assertThat(difference(newHashSet(1, 2), newHashSet(1, 2)).immutableCopy()).isEmpty();
    assertThat(symmetricDifference(newHashSet(1, 2), newHashSet(1, 2)).immutableCopy()).isEmpty();
  }

R8 / ProGuard
-------------

R8 and ProGuard are both code optimizers for `.class` files.

R8 is the [default optimizer][r8] in Android Studio 3.4 and newer. It works well with all
releases of OkHttp.

ProGuard was the previous default. We’re [tracking problems][proguard_problems] with interactions

		<-cdone
	}
}

// Borrowed from rwmutex_test.go
func TestParallelReaders(t *testing.T) {
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(-1))
	doTestParallelReaders(1, 4)
	doTestParallelReaders(3, 4)
	doTestParallelReaders(4, 2)
}

// Borrowed from rwmutex_test.go
func reader(resource string, numIterations int, activity *int32, cdone chan bool) {
	rwm := NewDRWMutex(ds, resource)
	for range numIterations {

        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2 });
        assertTrue(cos.isInMemory());
        cos.write(new byte[] { 3, 4 });
        assertTrue(cos.isInMemory());
        cos.write(new byte[] { 5 });
        assertTrue(cos.isInMemory());
        assertFalse(cos.done);
        cos.close();
    }

    @Test

比如，`item.dict(exclude_unset=True)`。

这段代码生成的 `dict` 只包含创建 `item` 模型时显式设置的数据，而不包括默认值。

然后再用它生成一个只含已设置（在请求中所发送）数据，且省略了默认值的 `dict`：

{* ../../docs_src/body_updates/tutorial002.py hl[34] *}

### 使用 Pydantic 的 `update` 参数

接下来，用 `.copy()` 为已有模型创建调用 `update` 参数的副本，该参数为包含更新数据的 `dict`。

例如，`stored_item_model.copy(update=update_data)`：

{* ../../docs_src/body_updates/tutorial002.py hl[35] *}

        byte[] dst = new byte[256];
        int bytesWritten = packet.writeTrailerWireFormat(dst, 0);

        assertTrue(bytesWritten > 0);
        // Each name should write at least 34 bytes (encoded name + scope)
        assertTrue(bytesWritten >= 68);
    }

    @Test
    @DisplayName("writeTrailerWireFormat with scope should handle scoped names")
    void testWriteTrailerWireFormatWithScope() {

  CheckOutputShapes(matmul_op,
                    /*input_shapes*/ {make_shape({3, 2}), make_shape({2, 4})},
                    /*input_tensors*/ {},
                    /*expected_shape*/ make_shape({3, 4}));

  // Infer shape when second operand has unknown shape.
  CheckOutputShapes(matmul_op,
                    /*input_shapes*/ {make_shape({3, 2}), unknown_shape()},
                    /*input_tensors*/ {},

<img src="/img/tutorial/security/image03.png">

Мы пока не проверяем валидность токена, но для начала это уже неплохо.

## Резюме { #recap }

		wantpos int64
		readerr error
		seekerr string
	}{
		{seek: io.SeekStart, off: 0, n: 20, want: "0123456789"},
		{seek: io.SeekStart, off: 1, n: 1, want: "1"},
		{seek: io.SeekCurrent, off: 1, wantpos: 3, n: 2, want: "34"},
		{seek: io.SeekStart, off: -1, seekerr: "bytes.Reader.Seek: negative position"},
		{seek: io.SeekStart, off: 1 << 33, wantpos: 1 << 33, readerr: io.EOF},
		{seek: io.SeekCurrent, off: 1, wantpos: 1<<33 + 1, readerr: io.EOF},