add Grid.Column#get/setAssistiveCaption (#10219)

* add Grid#Column#get/setAssistiveCaption

* fix test and update doc

* move testGridAssistiveCaption to GridTest

* delete test file

* delete test file

* Delete GridAssistiveCaptionTest.java

* Create GridAssistiveCaptionTest

* Create GridAssistiveCaption

* Rename GridAssistiveCaption to GridAssistiveCaption.java

* Rename GridAssistiveCaptionTest to GridAssistiveCaptionTest.java

* Reformat using eclipse

1 files changed, 7 insertions, 0 deletions

diff --git a/server/src/test/java/com/vaadin/tests/server/component/grid/GridTest.java b/server/src/test/java/com/vaadin/tests/server/component/grid/GridTest.java
index d27c7c5260..8e31e9acc6 100644
--- a/server/src/test/java/com/vaadin/tests/server/component/grid/GridTest.java
+++ b/server/src/test/java/com/vaadin/tests/server/component/grid/GridTest.java
@@ -80,6 +80,13 @@ public class GridTest {
     }
 
     @Test
+    public void testGridAssistiveCaption() {
+        assertEquals(null, fooColumn.getAssistiveCaption());
+        fooColumn.setAssistiveCaption("Press Enter to sort.");
+        assertEquals("Press Enter to sort.", fooColumn.getAssistiveCaption());
+    }
+
+    @Test
     public void testCreateGridWithDataCommunicator() {
         DataCommunicator<String> specificDataCommunicator = new DataCommunicator<>();