Allow specifying no destination for the uiexplorer test run

Summary: This is a simple change to allow not specifying xcodebuild's `-destination` flag if we just need to build the project without running the test.

Reviewed By: bestander

Differential Revision: D4173546

fbshipit-source-id: 0b77bb5fc01d8cb6a8c9bc765294796631839655

scripts/objc-test-ios.sh

@@ -9,7 +9,7 @@ cd $ROOT
 XCODE_PROJECT="Examples/UIExplorer/UIExplorer.xcodeproj"
 XCODE_SCHEME="UIExplorer"
 XCODE_SDK="iphonesimulator"
-if [ -z "$XCODE_DESTINATION" ]; then
+if [ -z ${XCODE_DESTINATION+x} ]; then
   XCODE_DESTINATION="platform=iOS Simulator,name=iPhone 5s,OS=10.0"
 fi
 

scripts/objc-test-tvos.sh

@@ -10,7 +10,7 @@ cd $ROOT
 XCODE_PROJECT="Examples/UIExplorer/UIExplorer.xcodeproj"
 XCODE_SCHEME="UIExplorer-tvOS"
 XCODE_SDK="appletvsimulator"
-if [ -z "$XCODE_DESTINATION" ]; then
+if [ -z ${XCODE_DESTINATION+x} ]; then
   XCODE_DESTINATION="platform=tvOS Simulator,name=Apple TV 1080p,OS=9.2"
 fi
 

scripts/objc-test.sh

@@ -34,9 +34,17 @@ fi
 # TODO: We use xcodebuild because xctool would stall when collecting info about
 # the tests before running them. Switch back when this issue with xctool has
 # been resolved.
+if [ -n "$XCODE_DESTINATION" ]; then
   xcodebuild \
     -project $XCODE_PROJECT \
     -scheme $XCODE_SCHEME \
     -sdk $XCODE_SDK \
     -destination "$XCODE_DESTINATION" \
     $XCODE_BUILD_STEPS
+else
+  xcodebuild \
+    -project $XCODE_PROJECT \
+    -scheme $XCODE_SCHEME \
+    -sdk $XCODE_SDK \
+    $XCODE_BUILD_STEPS
+fi