selection: Update addRange-nn.html for 20170227 draft.

third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js

Index: third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js b/third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js
index 855520e538964cade61ee190e5b9a71de84f95cf..7c443f7dade9c236f146d09f274eb9113a5ff90d 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js
+++ b/third_party/WebKit/LayoutTests/external/wpt/selection/addRange.js
@@ -2,19 +2,7 @@
 
 function testAddRange(exception, range, endpoints, qualifier, testName) {
     if (!isSelectableNode(endpoints[0]) || !isSelectableNode(endpoints[2])) {
-        test(function() {
-            assert_equals(exception, null, "Test setup must not throw exceptions");
-
-            assertSelectionNoChange(function() { selection.addRange(range); });
-            assert_equals(range.startContainer, endpoints[0],
-                "addRange() must not modify the startContainer of the Range it's given");
-            assert_equals(range.startOffset, endpoints[1],
-                "addRange() must not modify the startOffset of the Range it's given");
-            assert_equals(range.endContainer, endpoints[2],
-                "addRange() must not modify the endContainer of the Range it's given");
-            assert_equals(range.endOffset, endpoints[3],
-                "addRange() must not modify the endOffset of the Range it's given");
-        }, testName + ": " + qualifier + " addRange() must do nothing");
+        testAddRangeDoesNothing(exception, range, endpoints, qualifier, testName);
         return;
     }
 
@@ -127,6 +115,22 @@ function testAddRange(exception, range, endpoints, qualifier, testName) {
     }, testName + ": modifying the Selection's last Range must modify the " + qualifier + " added Range");
 }
 
+function testAddRangeDoesNothing(exception, range, endpoints, qualifier, testName) {
+    test(function() {
+        assert_equals(exception, null, "Test setup must not throw exceptions");
+
+        assertSelectionNoChange(function() { selection.addRange(range); });
+        assert_equals(range.startContainer, endpoints[0],
+            "addRange() must not modify the startContainer of the Range it's given");
+        assert_equals(range.startOffset, endpoints[1],
+            "addRange() must not modify the startOffset of the Range it's given");
+        assert_equals(range.endContainer, endpoints[2],
+            "addRange() must not modify the endContainer of the Range it's given");
+        assert_equals(range.endOffset, endpoints[3],
+            "addRange() must not modify the endOffset of the Range it's given");
+    }, testName + ": " + qualifier + " addRange() must do nothing");
+}
+
 // Do only n evals, not n^2
 var testRangesEvaled = testRanges.map(eval);
 
@@ -194,7 +198,7 @@ function testAddRangeSubSet(startIndex, optionalEndIndex) {
 
             testAddRange(exception, range1, endpoints1, "first", testName);
             if (selection.rangeCount > 0)
-                testAddRange(exception, range2, endpoints2, "second", testName);
+                testAddRangeDoesNothing(exception, range2, endpoints2, "second", testName);
         }
     }
 }