mojom: Add associative arrays to the mojom language.

mojo/public/cpp/bindings/tests/string_unittest.cc

 // Copyright 2014 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 "mojo/public/cpp/bindings/string.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 
@@ skipping 43 matching lines @@
   String s("hello world");
   String t("hello world");
   EXPECT_EQ(s, t);
   EXPECT_TRUE(s == t);
   EXPECT_TRUE("hello world" == s);
   EXPECT_TRUE(s == "hello world");
   EXPECT_TRUE("not" != s);
   EXPECT_TRUE(s != "not");
 }
 
+TEST(StringTest, LessThanNullness) {
+  String null;
+  String null2;
+  EXPECT_FALSE(null < null2);
+  EXPECT_FALSE(null2 < null);
+
+  String real("real");
+  EXPECT_TRUE(null < real);
+  EXPECT_FALSE(real < null);
+}
+
 }  // namespace test
 }  // namespace mojo