text: import pytest
  from typing import List
  from blacksheep import JsonContent, Request, StreamedContent
  from blacksheep.multipart import (
      parse_multipart,
      parse_content_disposition_values,
      get_boundary_from_header,
  )
  from blacksheep.contents import (
      parse_www_form,
      write_www_form_urlencoded,
      FormPart,
      MultiPartFormData,
      TextContent,
      HtmlContent,
  )
  from blacksheep.scribe import write_chunks, write_request_body_only
  
  
  @pytest.mark.asyncio
  async def test_chunked_encoding_with_generated_content():
      async def data_generator():
          yield b'{"hello":"world",'
          yield b'"lorem":'
          yield b'"ipsum","dolor":"sit"'
          yield b',"amet":"consectetur"}'
  
      content = StreamedContent(b"application/json", data_generator)
  
      chunks = []
  
      async for chunk in data_generator():
          chunks.append(chunk)
  
      gen = (item for item in chunks)
  
      async for chunk in write_chunks(content):
          try:
              generator_bytes = next(gen)
          except StopIteration:
              assert chunk == b"0\r\n\r\n"
          else:
              assert (
                  chunk
                  == hex(len(generator_bytes))[2:].encode()
                  + b"\r\n"
                  + generator_bytes
                  + b"\r\n"
              )
  
  
  @pytest.mark.parametrize(
      "content,expected_result",
      [
          [
              "Name=Gareth+Wylie&Age=24&Formula=a+%2B+b+%3D%3D+13%25%21",
              {"Name": "Gareth Wylie", "Age": "24", "Formula": "a + b == 13%!"},
          ],
          ["a=12&b=24&a=33", {"a": ["12", "33"], "b": "24"}],
      ],
  )
  def test_form_urlencoded_parser(content, expected_result):
      data = parse_www_form(content)
      assert expected_result == data
  
  
  @pytest.mark.parametrize(
      "data,expected_result",
      [
          [
              {"Name": "Gareth Wylie", "Age": 24, "Formula": "a + b == 13%!"},
              b"Name=Gareth+Wylie&Age=24&Formula=a+%2B+b+%3D%3D+13%25%21",
          ],
          [[("a", "13"), ("a", "24"), ("b", "5"), ("a", "66")], b"a=13&a=24&b=5&a=66"],
          [{"a": [13, 24, 66], "b": [5]}, b"a=13&a=24&a=66&b=5"],
      ],
  )
  def test_form_urlencoded_writer(data, expected_result):
      content = write_www_form_urlencoded(data)
      assert expected_result == content
  
  
  @pytest.mark.asyncio
  async def test_multipart_form_data():
      data = MultiPartFormData(
          [
              FormPart(b"text1", b"text default"),
              FormPart(b"text2", "aωb".encode("utf8")),
              FormPart(b"file1", b"Content of a.txt.\r\n", b"text/plain", b"a.txt"),
              FormPart(
                  b"file2",
                  b"<!DOCTYPE html><title>Content of a.html.</title>\r\n",
                  b"text/html",
                  b"a.html",
              ),
              FormPart(
                  b"file3", "aωb".encode("utf8"), b"application/octet-stream", b"binary"
              ),
          ]
      )
  
      whole = data.body
  
      expected_result_lines = [
          b"--" + data.boundary,
          b'Content-Disposition: form-data; name="text1"',
          b"",
          b"text default",
          b"--" + data.boundary,
          b'Content-Disposition: form-data; name="text2"',
          b"",
          "aωb".encode("utf8"),
          b"--" + data.boundary,
          b'Content-Disposition: form-data; name="file1"; filename="a.txt"',
          b"Content-Type: text/plain",
          b"",
          b"Content of a.txt.",
          b"",
          b"--" + data.boundary,
          b'Content-Disposition: form-data; name="file2"; filename="a.html"',
          b"Content-Type: text/html",
          b"",
          b"<!DOCTYPE html><title>Content of a.html.</title>",
          b"",
          b"--" + data.boundary,
          b'Content-Disposition: form-data; name="file3"; filename="binary"',
          b"Content-Type: application/octet-stream",
          b"",
          "aωb".encode("utf8"),
          b"--" + data.boundary + b"--",
          b"",
      ]
  
      assert whole == b"\r\n".join(expected_result_lines)
  
  
  def test_parse_multipart_two_fields():
      content = (
          b'--------28cbeda4cdd04d1595b71933e31928cd\r\nContent-Disposition: form-data; name="a"\r\n\r\nworld\r\n'
          b'--------28cbeda4cdd04d1595b71933e31928cd\r\nContent-Disposition: form-data; name="b"\r\n\r\n9000\r\n'
          b"--------28cbeda4cdd04d1595b71933e31928cd--\r\n"
      )
  
      data = list(parse_multipart(content))  # type: List[FormPart]
  
      assert data is not None
      assert len(data) == 2
  
      assert data[0].name == b"a"
      assert data[0].data == b"world"
      assert data[1].name == b"b"
      assert data[1].data == b"9000"
  
  
  def test_parse_multipart():
      boundary = b"---------------------0000000000000000000000001"
  
      content = b"\r\n".join(
          [
              boundary,
              b'Content-Disposition: form-data; name="text1"',
              b"",
              b"text default",
              boundary,
              b'Content-Disposition: form-data; name="text2"',
              b"",
              "aωb".encode("utf8"),
              boundary,
              b'Content-Disposition: form-data; name="file1"; filename="a.txt"',
              b"Content-Type: text/plain",
              b"",
              b"Content of a.txt.",
              b"",
              boundary,
              b'Content-Disposition: form-data; name="file2"; filename="a.html"',
              b"Content-Type: text/html",
              b"",
              b"<!DOCTYPE html><title>Content of a.html.</title>",
              b"",
              boundary,
              b'Content-Disposition: form-data; name="file3"; filename="binary"',
              b"Content-Type: application/octet-stream",
              b"",
              "aωb".encode("utf8"),
              boundary + b"--",
          ]
      )
  
      data = list(parse_multipart(content))  # type: List[FormPart]
  
      assert data is not None
      assert len(data) == 5
  
      assert data[0].name == b"text1"
      assert data[0].file_name is None
      assert data[0].content_type is None
      assert data[0].data == b"text default"
  
      assert data[1].name == b"text2"
      assert data[1].file_name is None
      assert data[1].content_type is None
      assert data[1].data == "aωb".encode("utf8")
  
      assert data[2].name == b"file1"
      assert data[2].file_name == b"a.txt"
      assert data[2].content_type == b"text/plain"
      assert data[2].data == b"Content of a.txt.\r\n"
  
      assert data[3].name == b"file2"
      assert data[3].file_name == b"a.html"
      assert data[3].content_type == b"text/html"
      assert data[3].data == b"<!DOCTYPE html><title>Content of a.html.</title>\r\n"
  
      assert data[4].name == b"file3"
      assert data[4].file_name == b"binary"
      assert data[4].content_type == b"application/octet-stream"
      assert data[4].data == "aωb".encode("utf8")
  
  
  @pytest.mark.parametrize(
      "value, expected_result",
      [
          [
              b'form-data; name="file2"; filename="a.html"',
              {b"type": b"form-data", b"name": b"file2", b"filename": b"a.html"},
          ],
          [b'form-data; name="example"', {b"type": b"form-data", b"name": b"example"}],
          [
              b'form-data; name="hello-world"',
              {b"type": b"form-data", b"name": b"hello-world"},
          ],
      ],
  )
  def test_parsing_content_disposition_header(value, expected_result):
      parsed = parse_content_disposition_values(value)
      assert parsed == expected_result
  
  
  @pytest.mark.parametrize(
      "value,expected_result",
      [
          (
              b"multipart/form-data; boundary=---------------------1321321",
              b"---------------------1321321",
          ),
          (
              b"multipart/form-data; boundary=--4ed15c90-6b4b-457f-99d8-e965c76679dd",
              b"--4ed15c90-6b4b-457f-99d8-e965c76679dd",
          ),
          (
              b"multipart/form-data; boundary=--4ed15c90-6b4b-457f-99d8-e965c76679dd",
              b"--4ed15c90-6b4b-457f-99d8-e965c76679dd",
          ),
          (
              b"multipart/form-data; boundary=-------------AAAA12345",
              b"-------------AAAA12345",
          ),
      ],
  )
  def test_extract_multipart_form_data_boundary(value, expected_result):
      boundary = get_boundary_from_header(value)
      assert boundary == expected_result
  
  
  def test_html_content_type():
      content = HtmlContent("<html></html>")
      assert content.type == b"text/html; charset=utf-8"
  
  
  @pytest.mark.parametrize("html", ["<html>ø</html>"])
  def test_html_content_data(html):
      content = HtmlContent(html)
      assert content.body == html.encode("utf8")
  
  
  def test_text_content_type():
      content = TextContent("Hello World")
      assert content.type == b"text/plain; charset=utf-8"
  
  
  @pytest.mark.parametrize(
      "text", ["Zucchero Fornaciari - Papà perché", "Отава Ё - На речке, на речке"]
  )
  def test_text_content_data(text):
      content = TextContent(text)
      assert content.body == text.encode("utf8")
  
  
  @pytest.mark.asyncio
  @pytest.mark.parametrize(
      "req,expected_chunks",
      [
          (
              Request(
                  "POST",
                  b"/",
                  headers=[
                      (b"content-type", b"application/json"),
                      (b"expect", b"100-continue"),
                  ],
              ).with_content(JsonContent({"id": "1", "name": "foo"})),
              [b'{"id": "1", "name": "foo"}'],
          ),
          (
              Request(
                  "POST",
                  b"/",
                  headers=[
                      (b"content-type", b"text/plain"),
                      (b"expect", b"100-continue"),
                  ],
              ).with_content(TextContent("Hello World")),
              [b"Hello World"],
          ),
      ],
  )
  async def test_write_request_body_only(req: Request, expected_chunks: List[bytes]):
      received_chunks = []
  
      async for chunk in write_request_body_only(req):
          received_chunks.append(chunk)
  
      assert received_chunks == expected_chunks
  