diff --git a/packer/test-run.sh b/packer/test-run.sh
new file mode 100755
index 000000000..a2f61e3b2
--- /dev/null
+++ b/packer/test-run.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+echo "Starting a manual test run ..."
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+DIST_DIR="$DIR/../dist"
+
+if [[ ! -d $DIST_DIR/mac || ! -d $DIST_DIR/linux-unpacked || ! -d $DIST_DIR/win-unpacked ]]; then
+    echo "ERR: Needs distributions built for Mac, Linux and Windows."
+    echo "Please run in this in the desktop directory:"
+    echo "$ yarn build --mac --linux --win"
+    exit 1
+fi
+
+has_resources() {
+    if ! tar tf "$1" | grep '[Rr]esources/app.asar' > /dev/null; then
+        echo "ERR: $1 for $2 does not contain a resource bundle. Check your packfile!"
+        exit 2
+    fi
+}
+
+has_no_resources() {
+    if (( $(tar tf "$1" | grep -cFv '[Rr]esources/app.asar') < 10 )); then
+        echo "ERR: $1 for $2 has suspiciously low number of non-resource files. Check your packfile!"
+        exit 2
+    fi
+}
+
+echo "Build for Mac ..."
+
+cargo run mac
+has_resources core.tar.xz mac
+has_no_resources frameworks.tar.xz mac
+cat manifest.json
+
+echo
+echo "All good."
+
+echo "Build for Linux ..."
+
+cargo run linux
+has_resources core.tar.xz linux
+has_no_resources frameworks.tar.xz linux
+cat manifest.json
+
+echo
+echo "All good."
+
+echo "Building for Windows ..."
+
+cargo run windows
+has_resources core.tar.xz windows
+has_no_resources frameworks.tar.xz windows
+cat manifest.json
+
+echo
+echo "All good. Ship it."