Make automated tests support running in Python 3.5.

NEWS

@@ -1,5 +1,6 @@
 1.2.9
  * #102: Fix for syntax error that occurred in Python 3.5 and below.
+ * Make automated tests support running in Python 3.5.
 
 1.2.8
  * #73: Enable consistency checks for only certain repositories via "check_repositories" option in

README.md

@@ -445,9 +445,6 @@ cd borgmatic
 tox
 ```
 
-Note that while running borgmatic itself only requires Python 3+, running
-borgmatic's tests require Python 3.6+.
-
 If when running tests, you get an error from the
 [Black](https://black.readthedocs.io/en/stable/) code formatter about files
 that would be reformatted, you can ask Black to format them for you via the

setup.py

@@ -30,6 +30,5 @@ setup(
     },
     obsoletes=['atticmatic'],
     install_requires=('pykwalify>=1.6.0,<14.06', 'ruamel.yaml>0.15.0,<0.16.0', 'setuptools'),
-    tests_require=('flexmock', 'pytest'),
     include_package_data=True,
 )

test_requirements.txt

@@ -1,7 +1,7 @@
 appdirs==1.4.3
 atomicwrites==1.2.1
 attrs==18.2.0
-black==18.9b0
+black==18.9b0; python_version >= '3.6'
 Click==7.0
 coverage==4.5.1
 docopt==0.6.2

tox.ini

@@ -8,7 +8,7 @@ deps = -rtest_requirements.txt
 commands =
     py.test --cov-report term-missing:skip-covered --cov=borgmatic --ignore=tests/end-to-end \
         tests []
-    black --skip-string-normalization --line-length 100 --check .
+    - black --skip-string-normalization --line-length 100 --check .
     flake8 .
 
 [testenv:black]