Add a script to test MBS in fedora-stg.

It does a little exercise... and it works!  Used today to test
mbs-1.4.1.  We can probably expand on this later to add other tests as
we like.

contrib/test-mbs-fedora-staging.sh

@@ -0,0 +1,43 @@
+#!/bin/bash -xe
+
+which fedpkg-stage || (echo "sudo dnf install fedpkg-stage" && exit 1)
+which jq || (echo "sudo dnf install jq" && exit 1)
+
+FAS=$USER
+rm -rf /var/tmp/mbs-test
+mkdir /var/tmp/mbs-test
+cd /var/tmp/mbs-test
+
+git clone ssh://$FAS@pkgs.stg.fedoraproject.org/rpms/perl-List-Compare
+git clone ssh://$FAS@pkgs.stg.fedoraproject.org/modules/testmodule
+
+cd perl-List-Compare
+git commit --allow-empty -m "Empty test commit, for MBS in staging."
+git push origin master
+cd ../testmodule
+git commit --allow-empty -m "Empty test commit, for MBS in staging."
+git push origin master
+build_id=$(fedpkg-stage module-build --optional rebuild_strategy=only-changed | tail -1 | awk '{ print $3 }' | cut -c 2-)
+echo "Working with module build $build_id"
+fedpkg-stage module-build-watch $build_id
+
+url=https://mbs.stg.fedoraproject.org/module-build-service/1/module-builds/$build_id
+state=$(curl $url | jq '.state')
+if [ "$state" -ne "5" ]; then
+    echo "module build state for #$build_id was $state"; exit 1;
+fi
+
+actual_task_id_1=$(curl $url | jq '.tasks.rpms."perl-List-Compare".task_id')
+actual_task_id_2=$(curl $url | jq '.tasks.rpms."perl-Tangerine".task_id')
+actual_task_id_3=$(curl $url | jq '.tasks.rpms.tangerine.task_id')
+
+if [ "$actual_task_id_1" -eq "90920002" ]; then
+    echo "perl-List-Compare task id was the same as before.  It was re-used!  Incorrect."; exit 1;
+fi
+if [ "$actual_task_id_2" -ne "90920003" ]; then
+    echo "perl-Tangerine task id was NOT the same as before.  It was not reused, but should have been."; exit 1;
+fi
+if [ "$actual_task_id_3" -ne "90919823" ]; then
+    echo "tangerine task id was NOT the same as before.  It was not reused, but should have been."; exit 1;
+fi
+echo "HOORAY!  It worked.. I think."