Add test script to verify tox targets run

We should be verifying that the tox target defined will run after
generating a project. There's no reason a brand new cookiecutter
repo should have failing tests.

Change-Id: Id142abd2f510a8cbfb42d32fb3f169a63552b981

tools/test_template.sh

@@ -10,7 +10,7 @@ tmp_dir="$1"
 out_dir="$tmp_dir/output"
 
 # The templates are above the tools directory.
-template_dir=$(dirname $(dirname $0))
+template_dir=$(readlink -e $(dirname $(dirname $0)))
 
 rm -rf $out_dir
 mkdir -p $out_dir

tools/test_tox_targets.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -eux -o pipefail
+
+# Wrapper around test_template.sh that runs tox tests in the resulting
+# repo to verify that our out-of-the-box configuration is valid
+
+tmp_dir=$(mktemp -d)
+trap "rm -rf $tmp_dir" EXIT
+
+tools_dir="$(dirname $0)"
+project_dir="$tmp_dir/output/oslo.testing"
+
+$tools_dir/test_template.sh "$tmp_dir"
+
+cd $project_dir
+
+# PBR requires a git repo for versioning
+git init .
+
+tox -e pep8,py27,py36,py37,docs,lower-constraints,cover