Provide an IT test to click Vaadin button inside Grid via space

IT verification test for #37.
Closes #37.

src/test/java/com/vaadin/flow/component/grid/it/ButtonInGridIT.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2000-2017 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.flow.component.grid.it;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.Keys;
+import org.openqa.selenium.WebElement;
+
+import com.vaadin.flow.testutil.AbstractComponentIT;
+import com.vaadin.flow.testutil.TestPath;
+
+@TestPath("vaadin-button-inside-grid")
+public class ButtonInGridIT extends AbstractComponentIT {
+
+    @Test
+    public void pressButtonUsingKeyboard() {
+        open();
+
+        WebElement firstCell = findElements(
+                By.tagName("vaadin-grid-cell-content")).stream()
+                        .filter(cell -> cell.getText().equals("Show item"))
+                        .findFirst().get();
+
+        WebElement vaadinButton = firstCell
+                .findElement(By.tagName("vaadin-button"));
+        vaadinButton.sendKeys(Keys.SPACE);
+
+        WebElement info = findElement(By.id("info"));
+        Assert.assertEquals("foo", info.getText());
+    }
+}

src/test/java/com/vaadin/flow/component/grid/it/ButtonInGridPage.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2000-2017 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.flow.component.grid.it;
+
+import com.vaadin.flow.component.button.Button;
+import com.vaadin.flow.component.grid.Grid;
+import com.vaadin.flow.component.html.Div;
+import com.vaadin.flow.router.Route;
+import com.vaadin.flow.theme.NoTheme;
+
+@Route("vaadin-button-inside-grid")
+@NoTheme
+public class ButtonInGridPage extends Div {
+
+    public ButtonInGridPage() {
+        Grid<String> grid = new Grid<>();
+        grid.setId("grid");
+
+        Div div = new Div();
+        div.setId("info");
+
+        grid.addComponentColumn(item -> new Button("Show item", evt -> {
+            div.setText(item);
+        })).setHeader("Click to see an item");
+
+        grid.setItems("foo", "bar");
+        add(grid, div);
+    }
+}