xcpretty was swallowing test errors

scripts/env/env.ios.sh

 
 brew tap wix/brew
 brew install wix/brew/applesimutils
-
-gem install xcpretty

scripts/test.unit.ios.js

 function run() {
   const conf = release ? `Release` : `Debug`;
 
-  execWithXcprettyIfPossible(`cd ./playground/ios &&
+  exec.execSync(`cd ./playground/ios &&
             RCT_NO_LAUNCH_PACKAGER=true
             xcodebuild build build-for-testing
             -scheme "ReactNativeNavigation"
             -sdk iphonesimulator
             -configuration ${conf}
             -derivedDataPath ./DerivedData/playground
+            -quiet
             ONLY_ACTIVE_ARCH=YES`);
 
-  execWithXcprettyIfPossible(`cd ./playground/ios &&
+  exec.execSync(`cd ./playground/ios &&
             RCT_NO_LAUNCH_PACKAGER=true
             xcodebuild test-without-building
             -scheme "ReactNativeNavigation"
             ONLY_ACTIVE_ARCH=YES`);
 }
 
-function execWithXcprettyIfPossible(cmd) {
-  if (exec.which('xcpretty')) {
-    exec.execSync(`${cmd} | xcpretty`);
-  } else {
-    exec.execSync(cmd);
-  }
-}
-
 run();