ci: add android patch e2e test (#1471)

scripts/patch_e2e.sh

@@ -0,0 +1,74 @@
+#!/bin/bash -ex
+
+# This script tests the patching functionality of Shorebird.
+# It creates a new empty, flutter project, initializes Shorebird,
+# creates a new release, patches the release, and then ensures
+# that the patch was applied correctly.
+#
+# Pre-requisites:
+# - Flutter must be installed.
+# - Android SDK must be installed.
+# - ADB must be installed and be part of PATH.
+# - Android emulator must be running.
+# - Shorebird must be installed.
+#
+# Usage: ./patch_e2e.sh
+
+TEMP_DIR=$(mktemp -d)
+cd $TEMP_DIR
+
+# Create a new empty flutter project
+flutter create e2e_test --empty --platforms android
+cd e2e_test
+
+# Replace the contents of "lib/main.dart" with a single print statement.
+echo "void main() { print('hello world'); }" >lib/main.dart
+
+# Initialize Shorebird
+shorebird init --force -v
+
+# Point to the development environment
+echo "base_url: https://api-dev.shorebird.dev" >> shorebird.yaml
+
+# Extract the app_id from the "shorebird.yaml"
+APP_ID=$(cat shorebird.yaml | grep 'app_id:' | awk '{print $2}')
+
+# Create a new release on Android
+shorebird release android --force -v
+
+# Run the app on Android and ensure that the print statement is printed.
+while IFS= read -r line; do
+    if [[ "$line" == *"I flutter : hello world"* ]]; then
+        adb kill-server
+        echo "✅ 'hello world' was printed"
+        break
+    fi
+done < <(shorebird preview --release-version 0.1.0+1 --app-id $APP_ID --platform android)
+
+# Replace lib/main.dart "hello world" to "hello shorebird"
+sed -i '' 's/hello world/hello shorebird/g' lib/main.dart
+
+# Create a patch
+shorebird patch android --force -v
+
+# Run the app on Android and ensure that the original print statement is printed.
+while IFS= read -r line; do
+    if [[ "$line" == *"I flutter : hello world"* ]]; then
+        sleep 5 # Wait for the patch to be installed.
+        adb kill-server
+        echo "✅ 'hello world' was printed"
+        break
+    fi
+done < <(shorebird preview --release-version 0.1.0+1 --app-id $APP_ID --platform android)
+
+# Re-run the app on Android and ensure that the new print statement is printed.
+while IFS= read -r line; do
+    if [[ "$line" == *"I flutter : hello shorebird"* ]]; then
+        adb kill-server
+        echo "✅ 'hello shorebird' was printed"
+        break
+    fi
+done < <(shorebird preview --release-version 0.1.0+1 --app-id $APP_ID --platform android)
+
+echo "✅ All tests passed!"
+exit 0