Adding unit test for ephemeral feature flag

This was something that was missing in #707.
Adding a new test to make sure the ephemeral feature flag from upstream
is set up correctly by the script.

test/entrypoint/should_switch_to_ephemeral_upstream_feature/test.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+# UNITTEST: should work as non ephemeral
+# Will simulate a scenario where ephemeral=false. expects:
+# - the configuration step to be run exactly once
+# - the entrypoint script to exit with no error
+# - the runsvc.sh script to run without the --once flag
+
+source ../logging.sh
+
+entrypoint_log() {
+  while read I; do
+    printf "\tentrypoint.sh: $I\n"
+  done
+}
+
+log "Setting up the test"
+export UNITTEST=true
+export RUNNER_HOME=localhome
+export RUNNER_NAME="example_runner_name"
+export RUNNER_REPO="myorg/myrepo"
+export RUNNER_TOKEN="xxxxxxxxxxxxx"
+export RUNNER_EPHEMERAL=true
+export RUNNER_FEATURE_FLAG_EPHEMERAL=true
+
+mkdir -p ${RUNNER_HOME}/bin
+# add up the config.sh and runsvc.sh
+ln -s ../config.sh ${RUNNER_HOME}/config.sh
+ln -s ../../runsvc.sh ${RUNNER_HOME}/bin/runsvc.sh
+
+cleanup() {
+  rm -rf ${RUNNER_HOME}
+  unset UNITTEST
+  unset RUNNERHOME
+  unset RUNNER_NAME
+  unset RUNNER_REPO
+  unset RUNNER_TOKEN
+  unset RUNNER_EPHEMERAL
+  unset RUNNER_FEATURE_FLAG_EPHEMERAL
+}
+
+trap cleanup SIGINT SIGTERM SIGQUIT EXIT
+
+log "Running the entrypoint"
+log ""
+
+../../../runner/entrypoint.sh 2> >(entrypoint_log)
+
+if [ "$?" != "0" ]; then
+  error "==========================================="
+  error "Entrypoint script did not exit successfully"
+  exit 1
+fi
+
+log "Testing if we went through the configuration step only once"
+count=`cat ${RUNNER_HOME}/counter || echo "not_found"`
+if [ ${count} != "1" ]; then
+  error "==============================================="
+  error "The configuration step was not run exactly once"
+  exit 1
+fi
+
+log "Testing if the configuration included the --ephemeral flag"
+if ! grep -q -- '--ephemeral' ${RUNNER_HOME}/runner_config; then
+  error "==============================================="
+  error "The configuration did not include the --ephemeral flag"
+  exit 1
+fi
+
+success "The configuration ran ${count} time(s)"
+
+log "Testing if runsvc ran"
+if [ ! -f "${RUNNER_HOME}/runsvc_ran" ]; then
+  error "=============================="
+  error "The runner service has not run"
+  exit 1
+fi
+success "The service ran"
+success ""
+success "==========================="
+success "Test completed successfully"