Add cleanup function to test scripts (#863)

test/tests/test_fn_update/test_scale_change.sh

@@ -12,9 +12,21 @@ targetMinScale=2
 targetMaxScale=6
 targetCpuPercent=60
 
+cleanup() {
+    log "Cleaning up..."
+    fission env delete --name $env || true
+    fission fn delete --name $fn || true
+}
+
+cleanup
+if [ -z "${TEST_NOCLEANUP:-}" ]; then
+    trap cleanup EXIT
+else
+    log "TEST_NOCLEANUP is set; not cleaning up test artifacts afterwards."
+fi
+
 log "Creating Python env $env"
 fission env create --name $env --image fission/python-env --mincpu 20 --maxcpu 100 --minmemory 128 --maxmemory 256
-trap "fission env delete --name $env" EXIT
 
 log "Creating function $fn"
 fission fn create --name $fn --env $env --code $ROOT/examples/python/hello.py --minscale 1 --maxscale 4 --executortype newdeploy --mincpu 20 --maxcpu 100 --minmemory 128 --maxmemory 256