Merge branch 'master' into patch-2

.travis.yml

@@ -36,5 +36,5 @@ jobs:
       python: '3.7'
       dist: xenial   
     - stage: coverage
-      python: 3.6
+      python: '3.6'
       script: codecov

Makefile

@@ -1,7 +1,7 @@
 .PHONY: docs
 init:
 	pip install pipenv --upgrade
-	pipenv install --dev --skip-lock
+	pipenv install --dev
 test:
 	# This runs all of the tests, on both Python 2 and Python 3.
 	detox

Pipfile

@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [dev-packages]
-pytest = ">=2.8.0"
+pytest = ">=2.8.0,<4.1"
 codecov = "*"
 pytest-httpbin = ">=0.0.7"
 pytest-mock = "*"

tests/test_requests.py

@@ -9,6 +9,7 @@
 import collections
 import contextlib
 import warnings
+import re
 
 import io
 import requests
@@ -2418,9 +2419,17 @@ class TestPreparingURLs(object):
         )
     )
     def test_preparing_url(self, url, expected):
+
+        def normalize_percent_encode(x):
+            # Helper function that normalizes equivalent 
+            # percent-encoded bytes before comparisons
+            for c in re.findall(r'%[a-fA-F0-9]{2}', x):
+                x = x.replace(c, c.upper())
+            return x
+
         r = requests.Request('GET', url=url)
         p = r.prepare()
-        assert p.url == expected
+        assert normalize_percent_encode(p.url) == expected
 
     @pytest.mark.parametrize(
         'url',