fix(@angular/cli): don't rerun protractor on rebuild (#4661)

Author: filipesilva

packages/@angular/cli/commands/e2e.ts

@@ -56,7 +56,19 @@ const E2eCommand = Command.extend({
       });
 
       // Protractor will end the proccess, so we don't need to kill the dev server
-      return serve.run(commandOptions, () => e2eTask.run(commandOptions));
+      return new Promise((resolve, reject) => {
+        let firstRebuild = true;
+        function rebuildCb() {
+          // don't run re-run tests on subsequent rebuilds
+          if (firstRebuild) {
+            firstRebuild = false;
+            return resolve(e2eTask.run(commandOptions));
+          }
+        }
+
+        serve.run(commandOptions, rebuildCb)
+          .catch(reject);
+      });
     } else {
       return e2eTask.run(commandOptions);
     }

tests/e2e/tests/misc/minimal-config.ts

@@ -15,7 +15,7 @@ export default function () {
       }],
       e2e: { protractor: { config: './protractor.conf.js' } }
     })))
-    .then(() => ng('e2e'))
+    .then(() => ng('e2e', '--no-progress'))
     .then(() => writeMultipleFiles({
       './src/script.js': `
         document.querySelector('app-root').innerHTML = '<h1>app works!</h1>';
@@ -40,5 +40,5 @@ export default function () {
         e2e: { protractor: { config: './protractor.conf.js' } }
       }),
     }))
-    .then(() => ng('e2e'));
+    .then(() => ng('e2e', '--no-progress'));
 }