Improve VisibleUnitsTest.localCaretRectOfPosition

Source/core/editing/VisibleUnitsTest.cpp

Index: Source/core/editing/VisibleUnitsTest.cpp
diff --git a/Source/core/editing/VisibleUnitsTest.cpp b/Source/core/editing/VisibleUnitsTest.cpp
index 516004f258581ed349e9085e2a19de03532890ff..107baf8816b205c3fff528778622fb58332f8ec3 100644
--- a/Source/core/editing/VisibleUnitsTest.cpp
+++ b/Source/core/editing/VisibleUnitsTest.cpp
@@ -63,11 +63,13 @@ TEST_F(VisibleUnitsTest, localCaretRectOfPosition)
     RefPtrWillBeRawPtr<Element> one = document().getElementById("one");
 
     LayoutObject* layoutObjectFromDOMTree;
-    LayoutRect layoutRectFromDOMTree = localCaretRectOfPosition(Position(one, 0), layoutObjectFromDOMTree);
+    LayoutRect layoutRectFromDOMTree = localCaretRectOfPosition(Position(one->firstChild(), 0), layoutObjectFromDOMTree);
 
     LayoutObject* layoutObjectFromComposedTree;
-    LayoutRect layoutRectFromComposedTree = localCaretRectOfPosition(PositionInComposedTree(one, 0), layoutObjectFromComposedTree);
+    LayoutRect layoutRectFromComposedTree = localCaretRectOfPosition(PositionInComposedTree(one->firstChild(), 0), layoutObjectFromComposedTree);
 
+    EXPECT_TRUE(layoutObjectFromDOMTree);
+    EXPECT_FALSE(layoutRectFromDOMTree.isEmpty());
     EXPECT_EQ(layoutObjectFromDOMTree, layoutObjectFromComposedTree);
     EXPECT_EQ(layoutRectFromDOMTree, layoutRectFromComposedTree);
 }