Mark more tests that require the network

I believe all these tests require the network, at least they seem to
fail if it's I run them without connecting my computer to the web.

I'm looking at this as part of packaging linkchecker for GNU Guix,
where the package is build and the tests are run in a isolated
environment, intentionally without network access, to avoid issues
with non-reproducible package builds.

tests/checker/test_http.py

@@ -20,6 +20,7 @@ Test http checking.
 
 import pytest
 
+from tests import need_network
 from .httpserver import HttpServerTest, CookieRedirectHttpRequestHandler
 
 class TestHttp (HttpServerTest):
@@ -29,6 +30,7 @@ class TestHttp (HttpServerTest):
         super(TestHttp, self).__init__(methodName=methodName)
         self.handler = CookieRedirectHttpRequestHandler
 
+    @need_network
     def test_html (self):
         confargs = dict(recursionlevel=1)
         self.file_test("http.html", confargs=confargs)

tests/checker/test_http_misc.py

@@ -20,11 +20,13 @@ Test http checking.
 import os
 import sys
 from .httpserver import HttpServerTest
+from tests import need_network
 from linkcheck.network import iputil
 
 class TestHttpMisc (HttpServerTest):
     """Test http:// misc link checking."""
 
+    @need_network
     def test_html (self):
         self.swf_test()
         self.obfuscate_test()

tests/checker/test_http_redirect.py

@@ -17,6 +17,7 @@
 """
 Test http checking.
 """
+from tests import need_network
 from .httpserver import HttpServerTest, CookieRedirectHttpRequestHandler
 
 class TestHttpRedirect (HttpServerTest):
@@ -26,6 +27,7 @@ class TestHttpRedirect (HttpServerTest):
         super(TestHttpRedirect, self).__init__(methodName=methodName)
         self.handler = CookieRedirectHttpRequestHandler
 
+    @need_network
     def test_redirect (self):
         self.redirect1()
         self.redirect2()

tests/checker/test_httpbin.py

@@ -18,6 +18,7 @@
 Test http stuff with httpbin.org.
 """
 import re
+from tests import need_network
 from . import LinkCheckTest
 
 
@@ -30,6 +31,7 @@ def get_httpbin_url(path):
 class TestHttpbin(LinkCheckTest):
     """Test http:// link redirection checking."""
 
+    @need_network
     def test_http_link(self):
         linkurl = u"http://www.example.com"
         nlinkurl = self.norm(linkurl)
@@ -48,6 +50,7 @@ class TestHttpbin(LinkCheckTest):
         ]
         self.direct(url, resultlines, recursionlevel=1)
 
+    @need_network
     def test_basic_auth(self):
         user = u"testuser"
         password = u"testpassword"
@@ -67,6 +70,7 @@ class TestHttpbin(LinkCheckTest):
         ]
         self.direct(url, resultlines, confargs=confargs)
 
+    @need_network
     def test_http_refresh_header(self):
         linkurl = u"http://www.example.com"
         nlinkurl = self.norm(linkurl)
@@ -85,6 +89,7 @@ class TestHttpbin(LinkCheckTest):
         ]
         self.direct(url, resultlines, recursionlevel=1)
 
+    @need_network
     def test_http_content_location_header(self):
         linkurl = u"http://www.example.com"
         nlinkurl = self.norm(linkurl)

tests/checker/test_misc.py

@@ -17,6 +17,7 @@
 """
 Test miscellaneous html tag parsing and URL types
 """
+from tests import need_network
 from . import LinkCheckTest
 
 
@@ -25,15 +26,18 @@ class TestMisc (LinkCheckTest):
     Test misc link types.
     """
 
+    @need_network
     def test_misc (self):
         self.file_test("misc.html")
 
     def test_html5 (self):
         self.file_test("html5.html")
 
+    @need_network
     def test_archive (self):
         self.file_test("archive.html")
 
+    @need_network
     def test_itms_services(self):
         url = u"itms-services:?action=download-manifest&url=http://www.example.com/"
         resultlines = [

tests/checker/test_whitespace.py

@@ -17,6 +17,7 @@
 """
 Test whitespace handling.
 """
+from tests import need_network
 from . import LinkCheckTest
 
 
@@ -25,6 +26,7 @@ class TestWhitespace (LinkCheckTest):
     Test whitespace in URLs.
     """
 
+    @need_network
     def test_leading_whitespace (self):
         # Leading whitespace
         url = u" http://www.example.org/"
@@ -50,6 +52,7 @@ class TestWhitespace (LinkCheckTest):
         ]
         self.direct(url, resultlines)
 
+    @need_network
     def test_trailing_whitespace (self):
         # Trailing whitespace
         url = u"http://www.example.org/ "