xcode unit tests

playground/package.json

     "start": "adb reverse tcp:8081 tcp:8081; watchman watch-del-all; react-native start",
     "xcode": "open ios/playground.xcodeproj",
     "android": "cd android && ./gradlew installDebug",
+    "xcodeunit": "node ./scripts/xCodeUnit.js",
     "e2e": "node ./scripts/e2e.ios.js"
   },
   "//": "use react-native-navigation: 2.x.x --> we are manually installing it from a script for quicker workflow. Along with detox and shell-utils",

playground/scripts/xCodeUnit.js

+const _ = require('lodash');
+const shellUtils = require('shell-utils');
+const fs = require('fs');
+
+function testProject() {
+  shellUtils.exec.execSync(`echo 'travis_fold:start:xcodeunit'`);
+  const cmd = `RCT_NO_LAUNCH_PACKAGER=true
+          cd ios && xcodebuild
+            test
+            -scheme "playground"
+            -project playground.xcodeproj
+            -destination 'platform=iOS Simulator,name=iPhone 7'
+            `;
+
+  if (hasXcpretty()) {
+    shellUtils.exec.execSync(`${cmd} | xcpretty && exit \${PIPESTATUS[0]}`);
+  } else {
+    shellUtils.exec.execSync(`${cmd}`);
+  }
+  shellUtils.exec.execSync(`echo 'travis_fold:end:xcodeunit'`);
+}
+function hasXcpretty() {
+  try {
+    return shellUtils.exec.execSyncRead(`which xcpretty`);
+  } catch (e) {
+    return false;
+  }
+}
+
+function run() {
+  testProject();
+}
+
+run();

scripts/test.ios.js

 function run() {
   process.chdir('./playground');
   exec.execSync(`yarn run quickinstall`);
+  exec.execSync(`yarn run xcodeunit`);
   exec.execSync(`yarn run e2e release`);
   process.chdir('../');
 }