Fix invalid selection produced when dragging mouse outside the SVG text element

third_party/WebKit/LayoutTests/svg/text/resources/SelectionTestCase.js

 if (!window.eventSender || !window.testRunner) {
     alert('This test needs to be run in DRT, to get results!');
 }
 
 var svgRoot = 0;
 
 // Map 'point' into absolute coordinates, usable for eventSender
 function transformPoint(point, matrix) {
     return point.matrixTransform(matrix);
 }
@@ skipping 112 matching lines @@
         var textElement = document.createElementNS("http://www.w3.org/2000/svg", "svg:text");
         textElement.setAttribute("x", "0");
         textElement.setAttribute("y", "35");
         textElement.setAttribute("fill", "red");
         textElement.setAttribute("transform", "scale(0.5)");
         textElement.setAttribute("font-size", "8");
         textElement.textContent = "Expected '" + expectedText + "' to be selected, got: '" + actualText + "'";
         document.getElementById("container").appendChild(textElement);
     }
 }
+
+function selectTextFromCharToPoint(selectionInfo, mouse, expectedRange) {
+  var element = document.getElementById(selectionInfo.id);
+  var startPos = element.getStartPositionOfChar(selectionInfo.offset);
+  var absStartPos = toAbsoluteCoordinates(startPos, element);
+  if (window.eventSender) {
+    eventSender.mouseMoveTo(absStartPos.x, absStartPos.y);
+    eventSender.mouseDown();
+    eventSender.mouseMoveTo(mouse.x, mouse.y);
+    eventSender.mouseUp();
+  }
+
+  range = window.getSelection().getRangeAt(0);
+  shouldBe("range.startOffset", expectedRange.start);

[fs, 2016/02/12 17:05:42]

You should check for an expected element here too. (For both of the end-points.)

[hyunjunekim2, 2016/02/15 13:34:20]

Done.

+  shouldBe("range.endOffset", expectedRange.end);
+  if (window.eventSender) {
+    eventSender.mouseMoveTo(0,0);
+    eventSender.mouseDown();
+    eventSender.mouseUp();
+  }
+}