Add missing operators for CFX_ByteString.

core/src/fxcrt/fx_basic_bstring_unittest.cpp

 // Copyright 2014 PDFium 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 "testing/gtest/include/gtest/gtest.h"
 #include "../../../testing/fx_string_testhelpers.h"
 #include "../../include/fxcrt/fx_basic.h"
 
+TEST(fxcrt, ByteStringOperatorSubscript) {
+    // CFX_ByteString includes the NUL terminator for non-empty strings.
+    CFX_ByteString abc("abc");
+    EXPECT_EQ('a', abc[0]);
+    EXPECT_EQ('b', abc[1]);
+    EXPECT_EQ('c', abc[2]);
+    EXPECT_EQ(0, abc[3]);
+}
+
+TEST(fxcrt, ByteStringOperatorLT) {
+    CFX_ByteString empty;
+    CFX_ByteString a("a");
+    CFX_ByteString abc("abc");
+    CFX_ByteString def("def");
+
+    EXPECT_FALSE(empty < empty);
+    EXPECT_FALSE(a < a);
+    EXPECT_FALSE(abc < abc);
+    EXPECT_FALSE(def < def);
+
+    EXPECT_TRUE(empty < a);
+    EXPECT_FALSE(a < empty);
+
+    EXPECT_TRUE(empty < abc);
+    EXPECT_FALSE(abc < empty);
+
+    EXPECT_TRUE(empty < def);
+    EXPECT_FALSE(def < empty);
+
+    EXPECT_TRUE(a < abc);
+    EXPECT_FALSE(abc < a);
+
+    EXPECT_TRUE(a < def);
+    EXPECT_FALSE(def < a);
+
+    EXPECT_TRUE(abc < def);
+    EXPECT_FALSE(def < abc);
+}
+
 TEST(fxcrt, ByteStringCNull) {
   CFX_ByteStringC null_string;
   EXPECT_EQ(null_string.GetPtr(), nullptr);
   EXPECT_EQ(null_string.GetLength(), 0);
   EXPECT_TRUE(null_string.IsEmpty());
 
   CFX_ByteStringC another_null_string;
   EXPECT_EQ(null_string, another_null_string);
 
   CFX_ByteStringC copied_null_string(null_string);
@@ skipping 164 matching lines @@
   CFX_ByteString short_string("a");
   CFX_ByteString longer_string("abc");
   CFX_ByteString embedded_nul_string("ab\0c", 4);
 
   EXPECT_EQ('a', short_string.GetAt(0));
   EXPECT_EQ('c', longer_string.GetAt(2));
   EXPECT_EQ('b', embedded_nul_string.GetAt(1));
   EXPECT_EQ('\0', embedded_nul_string.GetAt(2));
   EXPECT_EQ('c', embedded_nul_string.GetAt(3));
 }