Travis CI reliability fixes: preload package manager and increase tim…

Summary:
- Consolidate common code in iOS and tvOS test scripts
- Start the packager before starting tests, to improve reliability
- Increase timeout value in RCTTestRunner.m
Closes https://github.com/facebook/react-native/pull/10378

Differential Revision: D4028364

Pulled By: bestander

fbshipit-source-id: 24c2124a1c62643a02f0668b60a67b971e08d1a3

scripts/objc-test.sh

@@ -1,11 +1,18 @@
 #!/bin/bash
 
-set -ex
+# This script contains common code to be run from scripts/objc-test-ios.sh or scripts/objc-test-tvos.sh
 
-SCRIPTS=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
-ROOT=$(dirname $SCRIPTS)
-
-cd $ROOT
+# Start the packager and preload the UIExplorerApp bundle for better performance in integration tests
+open "./packager/launchPackager.command" || echo "Can't start packager automatically"
+sleep 20
+curl 'http://localhost:8081/Examples/UIExplorer/js/UIExplorerApp.ios.bundle?platform=ios&dev=true' -o temp.bundle
+rm temp.bundle
+curl 'http://localhost:8081/Examples/UIExplorer/js/UIExplorerApp.ios.bundle?platform=ios&dev=true&minify=false' -o temp.bundle
+rm temp.bundle
+curl 'http://localhost:8081/IntegrationTests/IntegrationTestsApp.bundle?platform=ios&dev=true' -o temp.bundle
+rm temp.bundle
+curl 'http://localhost:8081/IntegrationTests/RCTRootViewIntegrationTestApp.bundle?platform=ios&dev=true' -o temp.bundle
+rm temp.bundle
 
 function cleanup {
   EXIT_CODE=$?
@@ -21,13 +28,6 @@ function cleanup {
 }
 trap cleanup EXIT
 
-XCODE_PROJECT="Examples/UIExplorer/UIExplorer.xcodeproj"
-XCODE_SCHEME="UIExplorer"
-XCODE_SDK="iphonesimulator"
-if [ -z "$XCODE_DESTINATION" ]; then
-  XCODE_DESTINATION="platform=iOS Simulator,name=iPhone 5s,OS=10.0"
-fi
-
 # Support for environments without xcpretty installed
 set +e
 OUTPUT_TOOL=$(which xcpretty)