interceptors/http: set length on response (#174)

* interceptors/http: set length on response

In case there is no body handle it as read() is doing, that is returning
an empty body with length 0.

* Reword test name

* Fix linting error

---------

Co-authored-by: Sara <git@sarayourfriend.pictures>

Author: xrmx

src/pook/interceptors/http.py

@@ -76,6 +76,7 @@ def _on_request(self, _request, conn, method, url, body=None, headers=None, **kw
         mockres.code = res._status
         mockres.reason = http_reasons.get(res._status)
         mockres.headers = HTTPMessage()
+        mockres.length = len(res._body or b"")
 
         for hkey, hval in res._headers.itermerged():
             mockres.headers.add_header(hkey, hval)

tests/unit/interceptors/urllib_test.py

@@ -37,6 +37,7 @@ def test_urllib_ssl():
     res = urlopen("https://example.com")
 
     assert res.read() == b"Hello from pook"
+    assert res.length == 15
     assert res.version == 11
 
 
@@ -46,4 +47,14 @@ def test_urllib_clear():
     res = urlopen("http://example.com")
 
     assert res.read() == b"Hello from pook"
+    assert res.length == 15
+
+
+@pytest.mark.pook
+def test_without_body_response_length_is_zero():
+    pook.get("http://example.com").reply(200)
+    res = urlopen("http://example.com")
+
+    assert res.read() == b""
+    assert res.length == 0
     assert res.version == 11