Add Python 3.8 support

Closes #80.

.travis.yml

@@ -3,13 +3,10 @@ python:
     - 2.7
     - 3.5
     - 3.6
+    - 3.7
+    - 3.8
     - pypy
     - pypy3
-matrix:
-    include:
-        - python: "3.7"
-          dist: xenial
-          sudo: true
 install:
     - pip install coverage coveralls
     - pip install zope.testrunner flake8

CHANGES.rst

@@ -9,6 +9,9 @@ CHANGES
   exceptions for bad HTTP statuses.  See `issue 75
   <https://zopefoundation/zope.testbrowser/issue/75>`_.
 
+- Add Python 3.8 support.  See `issue 80
+  <https://github.com/zopefoundation/zope.testbrowser/issue/80>`_.
+
 
 5.3.3 (2019-07-02)
 ------------------

setup.py

@@ -47,6 +47,7 @@
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Testing',

src/zope/testbrowser/browser.py

@@ -14,7 +14,6 @@
 """Webtest-based Functional Doctest interfaces
 """
 
-import sys
 import re
 import time
 import io
@@ -1408,11 +1407,11 @@ class Timer(object):
     end_time = 0
 
     def _getTime(self):
-        if sys.platform.startswith('win'):
-            # Windows' time.clock gives us high-resolution wall-time
-            return time.clock()
+        if hasattr(time, 'perf_counter'):
+            # Python 3
+            return time.perf_counter()
         else:
-            # everyone else uses time.time
+            # Python 2
             return time.time()
 
     def start(self):

tox.ini

@@ -4,6 +4,7 @@ envlist =
     py35,
     py36,
     py37,
+    py38,
     pypy,
     pypy3,
     docs,
@@ -35,6 +36,7 @@ depends =
     py35,
     py36,
     py37,
+    py38,
     pypy,
     pypy3,