Fix Kokoro nightly release builds (#3597)

Author: chanseokoh

plugins/com.google.cloud.tools.eclipse.integration.appengine/src/com/google/cloud/tools/eclipse/integration/appengine/DebugNativeAppEngineStandardProjectTest.java

@@ -44,6 +44,7 @@
 import org.eclipse.swtbot.eclipse.finder.widgets.SWTBotView;
 import org.eclipse.swtbot.swt.finder.utils.SWTBotPreferences;
 import org.eclipse.swtbot.swt.finder.widgets.SWTBotMenu;
+import org.eclipse.swtbot.swt.finder.widgets.SWTBotShell;
 import org.eclipse.swtbot.swt.finder.widgets.SWTBotStyledText;
 import org.eclipse.swtbot.swt.finder.widgets.SWTBotToolbarButton;
 import org.eclipse.swtbot.swt.finder.widgets.SWTBotTree;
@@ -91,12 +92,11 @@ public void testDebugLaunch() throws Exception {
     assertNotNull(testProject);
     SwtBotTestingUtilities.waitUntilMenuHasItem(
         bot, () -> bot.menu("Run").menu("Debug As"), endsWith("Debug on Server"));
-    SwtBotTestingUtilities.performAndWaitForWindowChange(
-        bot,
-        () -> {
-          bot.menu("Run").menu("Debug As").menu("1 Debug on Server").click();
-        });
 
+    bot.menu("Run").menu("Debug As").menu("1 Debug on Server").click();
+    SwtBotTestingUtilities.waitUntilShellIsOpen(bot, "Debug On Server");
+    SWTBotShell debugPage = bot.shell("Debug On Server");
+    debugPage.activate();
     SwtBotTestingUtilities.clickButtonAndWaitForWindowClose(bot, bot.button("Finish"));
 
     bot.perspectiveById("org.eclipse.debug.ui.DebugPerspective")

plugins/com.google.cloud.tools.eclipse.swtbot/src/com/google/cloud/tools/eclipse/swtbot/SwtBotTestingUtilities.java

@@ -126,6 +126,23 @@ public boolean test() throws Exception {
     });
   }
 
+  /**
+   * Blocks the caller until the shell matching the text is open.
+   */
+  public static void waitUntilShellIsOpen(SWTBot bot, String text) {
+    bot.waitUntil(new DefaultCondition() {
+        @Override
+        public String getFailureMessage() {
+          return "Cannot find a shell with text '" + text + "'";
+        }
+
+        @Override
+        public boolean test() throws Exception {
+          return bot.shell(text).isOpen();
+        }
+      });
+  }
+
   /**
    * Blocks the caller until the given shell is closed.
    */