Make it easier to run one test

Author: nedbat

tox.ini

@@ -1,4 +1,13 @@
 # tox configuration for django_coverage_plugin.
+#
+# To run all the tests:
+#
+#   $ tox
+#
+# To run one test:
+#
+#   $ tox -- tests.test_extends.SsiTest.test_ssi_parsed
+#
 
 [tox]
 envlist = py{27,34}-django{14,15,16,17,18},check
@@ -17,7 +26,7 @@ deps =
 
 commands =
     {envpython} -c "import tests.banner"
-    {envpython} -m unittest discover -b
+    {envpython} -m unittest {posargs:discover -b}
 
 usedevelop = True