Indices passed to FilteredElementList public functions should consistently refer to element indices

tests/html/filteredelementlist_test.dart

Index: tests/html/filteredelementlist_test.dart
diff --git a/tests/html/filteredelementlist_test.dart b/tests/html/filteredelementlist_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5c0e5225288b4f82a12d972227b7d7312d3a8120
--- /dev/null
+++ b/tests/html/filteredelementlist_test.dart
@@ -0,0 +1,101 @@
+library filteredelementlist_test;
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import 'dart:html_common';
+
+main() {
+
+  var 
+    t1 = new Text('T1'),
+    t2 = new Text('T2'),
+    t3 = new Text('T3'),
+    t4 = new Text('T4');
+
+  var 
+    d1 = new DivElement(),
+    d2 = new DivElement(),
+    d3 = new DivElement();
+
+  createTestDiv() {
+    var testDiv = new DivElement();
+    testDiv
+      ..append(t1)
+      ..append(d1)
+      ..append(t2)
+      ..append(d2)
+      ..append(t3)
+      ..append(d3)
+      ..append(t4);
+    return testDiv;
+  }
+
+  useHtmlConfiguration();
+
+  test('FilteredElementList.insert test', () {
+
+    var i = new DivElement();
+
+    // Insert before first element
+    var nodeList = createTestDiv();
+    var elementList = new FilteredElementList(nodeList);
+    elementList.insert(0, i);
+    expect(nodeList.childNodes[0], t1);
+    expect(nodeList.childNodes[1], i);
+    expect(nodeList.childNodes[2], d1);
+
+    // Insert in middle
+    nodeList = createTestDiv();
+    elementList = new FilteredElementList(nodeList);
+    elementList.insert(1, i);
+    expect(nodeList.childNodes[2], t2);
+    expect(nodeList.childNodes[3], i);
+    expect(nodeList.childNodes[4], d2);
+
+    // Insert before last element
+    nodeList = createTestDiv();
+    elementList = new FilteredElementList(nodeList);
+    elementList.insert(2, i);
+    expect(nodeList.childNodes[4], t3);
+    expect(nodeList.childNodes[5], i);
+    expect(nodeList.childNodes[6], d3);
+  });
+
+  test('FilteredElementList.insertAll test', () {
+
+    var 
+      i1 = new DivElement(),
+      i2 = new DivElement();
+
+    var it = [i1, i2];
+
+    // Insert before first element
+    var nodeList = createTestDiv();
+    var elementList = new FilteredElementList(nodeList);
+    elementList.insertAll(0, it);
+    expect(nodeList.childNodes[0], t1);
+    expect(nodeList.childNodes[1], i1);
+    expect(nodeList.childNodes[2], i2);
+    expect(nodeList.childNodes[3], d1);
+
+    // Insert in middle
+    nodeList = createTestDiv();
+    elementList = new FilteredElementList(nodeList);
+    elementList.insertAll(1, it);
+    expect(nodeList.childNodes[2], t2);
+    expect(nodeList.childNodes[3], i1);
+    expect(nodeList.childNodes[4], i2);
+    expect(nodeList.childNodes[5], d2);
+
+    // Insert before last element
+    nodeList = createTestDiv();
+    elementList = new FilteredElementList(nodeList);
+    elementList.insertAll(2, it);
+    expect(nodeList.childNodes[4], t3);
+    expect(nodeList.childNodes[5], i1);
+    expect(nodeList.childNodes[6], i2);
+    expect(nodeList.childNodes[7], d3);
+  });
+
+}