Fixes unstable/muted tests (#11640)

uitest/src/test/java/com/vaadin/tests/components/combobox/ComboBoxClosePopupRetainTextTest.java

@@ -1,7 +1,5 @@
 package com.vaadin.tests.components.combobox;
 
-import static org.junit.Assert.assertEquals;
-
 import org.junit.Test;
 import org.openqa.selenium.WebElement;
 
@@ -9,6 +7,8 @@ import com.vaadin.testbench.By;
 import com.vaadin.testbench.elements.ComboBoxElement;
 import com.vaadin.tests.tb3.MultiBrowserTest;
 
+import static org.junit.Assert.assertEquals;
+
 public class ComboBoxClosePopupRetainTextTest extends MultiBrowserTest {
     @Override
     protected Class<?> getUIClass() {
@@ -37,7 +37,7 @@ public class ComboBoxClosePopupRetainTextTest extends MultiBrowserTest {
         ComboBoxElement cb = $(ComboBoxElement.class).first();
         cb.selectByText("Item 3");
         WebElement textbox = cb.findElement(By.vaadin("#textbox"));
-        textbox.clear();
+        cb.clear();
         textbox.sendKeys("I");
         // Close the open suggestions popup
         // Uses #clickElement instead of ComboBoxElement#openPopup() due to an

uitest/src/test/java/com/vaadin/tests/components/grid/GridResizeHiddenColumnTest.java

@@ -1,9 +1,5 @@
 package com.vaadin.tests.components.grid;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
 import java.util.List;
 
 import org.junit.Before;
@@ -18,6 +14,10 @@ import com.vaadin.testbench.elements.GridElement.GridCellElement;
 import com.vaadin.testbench.parallel.BrowserUtil;
 import com.vaadin.tests.tb3.MultiBrowserTest;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 public class GridResizeHiddenColumnTest extends MultiBrowserTest {
 
     @Before
@@ -74,6 +74,7 @@ public class GridResizeHiddenColumnTest extends MultiBrowserTest {
         for (GridCellElement e : headerCells) {
             widthSum += e.getSize().getWidth();
         }
+        sleep(100);
         assertEquals("'Last Name' column should take up the remaining space",
                 grid.getHeader().getSize().getWidth(), widthSum, 1d);
     }

uitest/src/test/java/com/vaadin/tests/components/window/WindowTwinColSelectTest.java

@@ -1,9 +1,5 @@
 package com.vaadin.tests.components.window;
 
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.assertTrue;
-
 import org.junit.Test;
 import org.openqa.selenium.WebElement;
 import org.openqa.selenium.interactions.Actions;
@@ -12,6 +8,9 @@ import com.vaadin.testbench.By;
 import com.vaadin.testbench.elements.TwinColSelectElement;
 import com.vaadin.tests.tb3.MultiBrowserTest;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 public class WindowTwinColSelectTest extends MultiBrowserTest {
 
     @Test
@@ -23,8 +22,8 @@ public class WindowTwinColSelectTest extends MultiBrowserTest {
         WebElement selectionsElement = twinColSelect.getSelectionsElement();
         assertTrue(optionsElement.isDisplayed());
         assertTrue(selectionsElement.isDisplayed());
-        assertThat(selectionsElement.getLocation().getY(),
-                is(optionsElement.getLocation().getY()));
+        assertEquals("Coordinate is not matching within the tolerance",
+                optionsElement.getLocation().getY(), selectionsElement.getLocation().getY(), 3);
     }
 
     @Test
@@ -41,7 +40,7 @@ public class WindowTwinColSelectTest extends MultiBrowserTest {
         WebElement selectionsElement = twinColSelect.getSelectionsElement();
         assertTrue(optionsElement.isDisplayed());
         assertTrue(selectionsElement.isDisplayed());
-        assertThat(selectionsElement.getLocation().getY(),
-                is(optionsElement.getLocation().getY()));
+        assertEquals("Coordinate is not matching within the tolerance.",
+                optionsElement.getLocation().getY(), selectionsElement.getLocation().getY(), 3);
     }
 }