[test] improve TableViewerTest eclipse-platform#1005

move "fViewer.getControl().update();" to front
eclipse-platform#1005

tests/org.eclipse.jface.tests/src/org/eclipse/jface/tests/viewers/TableViewerTest.java

@@ -20,6 +20,8 @@
 import static org.junit.Assert.assertTrue;
 
 import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.stream.Collectors;
 
 import org.eclipse.jface.viewers.ColumnLayoutData;
 import org.eclipse.jface.viewers.ColumnViewer;
@@ -196,14 +198,23 @@ public void testRemove() {
 	@Test
 	public void testContains() {
 		TableViewer tViewer = (TableViewer) fViewer;
+		fViewer.getControl().update();
+		String elements = toString(tViewer);
 		// some random element.
-		assertFalse("element must not be available on the viewer", tViewer.contains(""));
+		assertFalse("random element must not be available on the viewer. All Elements: " + elements,
+				tViewer.contains(""));
 
 		// first child of root.
-		assertTrue("element must be available on the viewer", tViewer.contains(fRootElement.getFirstChild()));
+		assertTrue("first element must be available on the viewer. All Elements: " + elements,
+				tViewer.contains(fRootElement.getFirstChild()));
 
 		// last child of the root
-		assertTrue("element must be available on the viewer", tViewer.contains(fRootElement.getLastChild()));
+		assertTrue("last element must be available on the viewer. All Elements: " + elements,
+				tViewer.contains(fRootElement.getLastChild()));
 	}
 
+	String toString(TableViewer viewer) {
+		TableItem[] items = viewer.getTable().getItems();
+		return Arrays.asList(items).stream().map(item -> item.getText()).collect(Collectors.joining(",", "'", "'"));
+	}
 }

tests/org.eclipse.jface.tests/src/org/eclipse/jface/tests/viewers/VirtualTableViewerTest.java

@@ -233,12 +233,15 @@ public void testRenameWithSorter() {
 		// Call update to make sure the viewer is in a correct state
 		// At least on MacOSX I get failures without this call
 		((TableViewer) fViewer).getControl().update();
+		assertEquals("unsorted", "0-0 name-0", getItemText(0));
 		fViewer.setComparator(new TestLabelComparator());
+		assertEquals("sorted", "0-9 name-9", getItemText(0));
 		TestElement first = fRootElement.getFirstChild();
+		((TableViewer) fViewer).getControl().update(); // before getFirstChild()!
 		first.setLabel("name-9999");
 		String newElementLabel = first.toString();
-		((TableViewer) fViewer).getControl().update();
-		assertEquals("sorted first", newElementLabel, getItemText(0));
+		assertEquals("label updated", "0-0 name-9999", newElementLabel);
+		assertEquals("item updated", "0-0 name-9999", getItemText(0));
 	}
 
 	@Override