Run tests against local httpbin instance via pytest-httpbin.

tests/test_windows.py

@@ -4,7 +4,7 @@ import tempfile
 import pytest
 from httpie.context import Environment
 
-from utils import TestEnvironment, http, httpbin
+from utils import TestEnvironment, http
 from httpie.compat import is_windows
 
 
@@ -13,17 +13,17 @@ class TestWindowsOnly:
 
     @pytest.mark.skipif(True,
                         reason='this test for some reason kills the process')
-    def test_windows_colorized_output(self):
+    def test_windows_colorized_output(self, httpbin):
         # Spits out the colorized output.
-        http(httpbin('/get'), env=Environment())
+        http(httpbin.url + '/get', env=Environment())
 
 
 class TestFakeWindows:
-    def test_output_file_pretty_not_allowed_on_windows(self):
+    def test_output_file_pretty_not_allowed_on_windows(self, httpbin):
         env = TestEnvironment(is_windows=True)
         output_file = os.path.join(
             tempfile.gettempdir(), '__httpie_test_output__')
         r = http('--output', output_file,
-                 '--pretty=all', 'GET', httpbin('/get'),
+                 '--pretty=all', 'GET', httpbin.url + '/get',
                  env=env, error_exit_ok=True)
         assert 'Only terminal output can be colorized on Windows' in r.stderr