diff --git a/static/js/tracker/ac_test.js b/static/js/tracker/ac_test.js
new file mode 100644
index 0000000..30eedc5
--- /dev/null
+++ b/static/js/tracker/ac_test.js
@@ -0,0 +1,40 @@
+/* Copyright 2016 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 or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
+
+var firstCharMap;
+
+function setUp() {
+  firstCharMap = new Object();
+}
+
+function testAddItemToFirstCharMap_OneWordLabel() {
+  _AC_AddItemToFirstCharMap(firstCharMap, 'h', 'Hot');
+  let hArray = firstCharMap['h'];
+  assertEquals(1, hArray.length);
+  assertEquals('Hot', hArray[0].value);
+
+  _AC_AddItemToFirstCharMap(firstCharMap, '-', '-Hot');
+  _AC_AddItemToFirstCharMap(firstCharMap, 'h', '-Hot');
+  let minusArray = firstCharMap['-'];
+  assertEquals(1, minusArray.length);
+  assertEquals('-Hot', minusArray[0].value);
+  hArray = firstCharMap['h'];
+  assertEquals(2, hArray.length);
+  assertEquals('Hot', hArray[0].value);
+  assertEquals('-Hot', hArray[1].value);
+}
+
+function testAddItemToFirstCharMap_KeyValueLabels() {
+  _AC_AddItemToFirstCharMap(firstCharMap, 'p', 'Priority-High');
+  _AC_AddItemToFirstCharMap(firstCharMap, 'h', 'Priority-High');
+  let pArray = firstCharMap['p'];
+  assertEquals(1, pArray.length);
+  assertEquals('Priority-High', pArray[0].value);
+  let hArray = firstCharMap['h'];
+  assertEquals(1, hArray.length);
+  assertEquals('Priority-High', hArray[0].value);
+}