Add script for unit test coverage job

This commit will add script that will allow to run non voting coverage job
which will detect any changes in the code coverage for each commit on review.

Change-Id: I0afdeefb55bfa28c8970048b112795b351abb48b

tools/cover.sh

@@ -0,0 +1,79 @@
+#!/bin/bash
+#
+# Copyright 2016: Mirantis Inc.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+ALLOWED_EXTRA_MISSING=4
+
+show_diff () {
+    head -1 $1
+    diff -U 0 $1 $2 | sed 1,2d
+}
+
+# Stash uncommited changes, checkout master and save coverage report
+uncommited=$(git status --porcelain | grep -v "^??")
+[[ -n $uncommited ]] && git stash > /dev/null
+git checkout HEAD^
+
+baseline_report=$(mktemp -t murano_dashboard_coverageXXXXXXX)
+find . -type f -name "*.pyc" -delete && nosetests --cover-erase --cover-package=muranodashboard
+coverage report > $baseline_report
+baseline_missing=$(awk 'END { print $3 }' $baseline_report)
+
+# Checkout back and unstash uncommited changes (if any)
+git checkout -
+[[ -n $uncommited ]] && git stash pop > /dev/null
+
+# Generate and save coverage report
+current_report=$(mktemp -t murano_dashboard_coverageXXXXXXX)
+find . -type f -name "*.pyc" -delete && nosetests --cover-erase --cover-package=muranodashboard
+coverage report > $current_report
+current_missing=$(awk 'END { print $3 }' $current_report)
+
+baseline_percentage=$(awk 'END { print $4 }' $baseline_report)
+current_percentage=$(awk 'END { print $4 }' $current_report)
+# Show coverage details
+allowed_missing=$((baseline_missing+ALLOWED_EXTRA_MISSING))
+
+echo "Baseline report:"
+echo "$(cat ${baseline_report})"
+echo "Proposed change report:"
+echo "$(cat ${current_report})"
+echo ""
+echo ""
+echo "Allowed to introduce missing lines : ${ALLOWED_EXTRA_MISSING}"
+echo "Missing lines in master            : ${baseline_missing}"
+echo "Missing lines in proposed change   : ${current_missing}"
+echo "Current percentage                 : ${baseline_percentage}"
+echo "Proposed change percentage         : ${current_percentage}"
+
+if [ $allowed_missing -gt $current_missing ];
+then
+    if [ $baseline_missing -lt $current_missing ];
+    then
+        show_diff $baseline_report $current_report
+        echo "I believe you can cover all your code with 100% coverage!"
+    else
+        echo "Thank you! You are awesome! Keep writing unit tests! :)"
+    fi
+    exit_code=0
+else
+    show_diff $baseline_report $current_report
+    echo "Please write more unit tests, we should keep our test coverage :( "
+    exit_code=1
+fi
+
+rm $baseline_report $current_report
+exit $exit_code

tox.ini

@@ -42,7 +42,7 @@ commands = {posargs}
 # because upstream infra does not yet support it. Once that's fixed, we can
 # drop the install_command.
 install_command = pip install -U --force-reinstall {opts} {packages}
-commands = nosetests --cover-erase --cover-package=muranodashboard --with-xcoverage
+commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:pyflakes]
 deps = flake8