Improve VisibleUnitsTest.localCaretRectOfPosition

Source/core/editing/VisibleUnitsTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/editing/VisibleUnits.h"
 
 #include "core/editing/EditingTestBase.h"
 #include "core/editing/VisiblePosition.h"
 
@@ skipping 45 matching lines @@
 {
     const char* bodyContent = "<p id='host'><b id='one'>1</b></p><b id='two'>22</b>";
     const char* shadowContent = "<b id='two'>22</b><content select=#one></content><b id='three'>333</b>";
     setBodyContent(bodyContent);
     setShadowContent(shadowContent);
     updateLayoutAndStyleForPainting();
 
     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);
 }
 
 TEST_F(VisibleUnitsTest, mostBackwardCaretPositionAfterAnchor)
 {
     const char* bodyContent = "<p id='host'><b id='one'>1</b></p><b id='two'>22</b>";
     const char* shadowContent = "<b id='two'>22</b><content select=#one></content><b id='three'>333</b>";
     setBodyContent(bodyContent);
     setShadowContent(shadowContent);
@@ skipping 38 matching lines @@
     setBodyContent(bodyContent);
     updateLayoutAndStyleForPainting();
     RefPtrWillBeRawPtr<Element> sample1 = document().getElementById("sample1");
     RefPtrWillBeRawPtr<Element> sample2 = document().getElementById("sample2");
 
     EXPECT_FALSE(rendersInDifferentPosition(Position::afterNode(sample1->firstChild()), Position(sample2->firstChild(), 0)));
     EXPECT_FALSE(rendersInDifferentPosition(Position::lastPositionInNode(sample1->firstChild()), Position(sample2->firstChild(), 0)));
 }
 
 } // namespace blink