test: fix flaky tests

Author: javier-godoy

src/test/java/com/flowingcode/vaadin/addons/gridhelpers/it/ResponsiveGridIT.java

@@ -46,54 +46,64 @@ public void setup() throws Exception {
   private void setWidth(int w) {
     executeScript("arguments[0].parentElement.style.width=" + w + "+'px';", grid);
     $server.roundtrip();
-    try {
-      Thread.sleep(100);
-    } catch (InterruptedException e) {
-      return;
-    }
+    sleep();
   }
 
   @Test
   public void testCreateResponsiveStep() {
     $server.responsiveStep(300);
     $server.roundtrip();
+    sleep();
     assertEquals(300, $server.getCurrentStep());
   }
 
   @Test
   public void testHide() {
     $server.responsiveStep(0).hide(0);
     $server.roundtrip();
+    sleep();
     assertTrue(!grid.hasColumn("Col 0"));
   }
 
   @Test
   public void testHideAll() throws InterruptedException {
     $server.responsiveStep(0).hideAll();
     $server.roundtrip();
-    Thread.sleep(100);
+    sleep();
     assertTrue(grid.getVisibleColumns().isEmpty());
   }
 
   @Test
   public void testShow() {
     $server.responsiveStep(0).hide(0);
     $server.roundtrip();
+    sleep();
     assertTrue(!grid.hasColumn("Col 0"));
 
     $server.responsiveStep(100).show(0);
     $server.roundtrip();
+    sleep();
     assertTrue(grid.hasColumn("Col 0"));
   }
 
+  private void sleep() {
+    try {
+      Thread.sleep(500);
+    } catch (InterruptedException e) {
+      return;
+    }
+  }
+
   @Test
   public void testShowAll() {
     $server.responsiveStep(0).hide(0);
     $server.roundtrip();
+    sleep();
     assertTrue(!grid.hasColumn("Col 0"));
 
     $server.responsiveStep(100).showAll();
     $server.roundtrip();
+    sleep();
     assertTrue(grid.hasColumn("Col 0"));
   }
 
@@ -102,19 +112,20 @@ public void testRemove() throws InterruptedException {
     $server.responsiveStep(300);
     $server.responsiveStep(400);
     $server.roundtrip();
-    Thread.sleep(100);
+    sleep();
     assertEquals(400, $server.getCurrentStep());
 
     $server.responsiveStep(400).remove();
     $server.roundtrip();
-    Thread.sleep(100);
+    sleep();
     assertEquals(300, $server.getCurrentStep());
   }
 
   @Test
   public void testAddListenerFireImmediately() {
     IListenerRegistration listener = $server.responsiveStep(200).addListener();
     $server.roundtrip();
+    sleep();
     assertEquals(1, listener.getCount());
     assertEquals(200, listener.getLastMinWidth());
   }
@@ -159,6 +170,7 @@ public void testListenerCumulativeFireImmediately() {
     $server.responsiveStep(300).addListener();
     IListenerRegistration listener = $server.responsiveStep(200).addListener();
     assertEquals(0, listener.getCount());
+    sleep();
 
     listener.cumulative();
     assertEquals(1, listener.getCount());