Convert string class names

Automated using git grep & sed.
Replace StringC classes with StringView classes.
Remove the CFX_ prefix and put string classes in fxcrt namespace.
Change AsStringC() to AsStringView().
Rename tests from TEST(fxcrt, *String*Foo) to TEST(*String*,
Foo).
Couple of tests needed to have their names regularlized.

BUG=pdfium:894

Change-Id: I7ca038685c8d803795f3ed02545124f7a224c83d
Reviewed-on: https://pdfium-review.googlesource.com/14151
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 1605 insertions, 0 deletions

diff --git a/core/fxcrt/widestring_unittest.cpp b/core/fxcrt/widestring_unittest.cpp
new file mode 100644
index 0000000000..949827f6f1
--- /dev/null
+++ b/core/fxcrt/widestring_unittest.cpp
@@ -0,0 +1,1605 @@
+// 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 "core/fxcrt/widestring.h"
+
+#include <algorithm>
+#include <vector>
+
+#include "core/fxcrt/fx_string.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(WideString, ElementAccess) {
+  const WideString abc(L"abc");
+  EXPECT_EQ(L'a', abc[0]);
+  EXPECT_EQ(L'b', abc[1]);
+  EXPECT_EQ(L'c', abc[2]);
+#ifndef NDEBUG
+  EXPECT_DEATH({ abc[4]; }, ".*");
+#endif
+
+  WideString mutable_abc = abc;
+  EXPECT_EQ(abc.c_str(), mutable_abc.c_str());
+  EXPECT_EQ(L'a', mutable_abc[0]);
+  EXPECT_EQ(L'b', mutable_abc[1]);
+  EXPECT_EQ(L'c', mutable_abc[2]);
+  EXPECT_EQ(abc.c_str(), mutable_abc.c_str());
+  EXPECT_EQ(L"abc", abc);
+
+  const wchar_t* c_str = abc.c_str();
+  mutable_abc.SetAt(0, L'd');
+  EXPECT_EQ(c_str, abc.c_str());
+  EXPECT_NE(c_str, mutable_abc.c_str());
+  EXPECT_EQ(L"abc", abc);
+  EXPECT_EQ(L"dbc", mutable_abc);
+
+  mutable_abc.SetAt(1, L'e');
+  EXPECT_EQ(L"abc", abc);
+  EXPECT_EQ(L"dec", mutable_abc);
+
+  mutable_abc.SetAt(2, L'f');
+  EXPECT_EQ(L"abc", abc);
+  EXPECT_EQ(L"def", mutable_abc);
+#ifndef NDEBUG
+  EXPECT_DEATH({ mutable_abc.SetAt(3, L'g'); }, ".*");
+  EXPECT_EQ(L"abc", abc);
+#endif
+}
+
+TEST(WideString, OperatorLT) {
+  WideString empty;
+  WideString a(L"a");
+  WideString abc(L"\x0110qq");  // Comes before despite endianness.
+  WideString def(L"\x1001qq");  // Comes after despite endianness.
+
+  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(WideString, OperatorEQ) {
+  WideString null_string;
+  EXPECT_TRUE(null_string == null_string);
+
+  WideString empty_string(L"");
+  EXPECT_TRUE(empty_string == empty_string);
+  EXPECT_TRUE(empty_string == null_string);
+  EXPECT_TRUE(null_string == empty_string);
+
+  WideString deleted_string(L"hello");
+  deleted_string.Delete(0, 5);
+  EXPECT_TRUE(deleted_string == deleted_string);
+  EXPECT_TRUE(deleted_string == null_string);
+  EXPECT_TRUE(deleted_string == empty_string);
+  EXPECT_TRUE(null_string == deleted_string);
+  EXPECT_TRUE(null_string == empty_string);
+
+  WideString wide_string(L"hello");
+  EXPECT_TRUE(wide_string == wide_string);
+  EXPECT_FALSE(wide_string == null_string);
+  EXPECT_FALSE(wide_string == empty_string);
+  EXPECT_FALSE(wide_string == deleted_string);
+  EXPECT_FALSE(null_string == wide_string);
+  EXPECT_FALSE(empty_string == wide_string);
+  EXPECT_FALSE(deleted_string == wide_string);
+
+  WideString wide_string_same1(L"hello");
+  EXPECT_TRUE(wide_string == wide_string_same1);
+  EXPECT_TRUE(wide_string_same1 == wide_string);
+
+  WideString wide_string_same2(wide_string);
+  EXPECT_TRUE(wide_string == wide_string_same2);
+  EXPECT_TRUE(wide_string_same2 == wide_string);
+
+  WideString wide_string1(L"he");
+  WideString wide_string2(L"hellp");
+  WideString wide_string3(L"hellod");
+  EXPECT_FALSE(wide_string == wide_string1);
+  EXPECT_FALSE(wide_string == wide_string2);
+  EXPECT_FALSE(wide_string == wide_string3);
+  EXPECT_FALSE(wide_string1 == wide_string);
+  EXPECT_FALSE(wide_string2 == wide_string);
+  EXPECT_FALSE(wide_string3 == wide_string);
+
+  WideStringView null_string_c;
+  WideStringView empty_string_c(L"");
+  EXPECT_TRUE(null_string == null_string_c);
+  EXPECT_TRUE(null_string == empty_string_c);
+  EXPECT_TRUE(empty_string == null_string_c);
+  EXPECT_TRUE(empty_string == empty_string_c);
+  EXPECT_TRUE(deleted_string == null_string_c);
+  EXPECT_TRUE(deleted_string == empty_string_c);
+  EXPECT_TRUE(null_string_c == null_string);
+  EXPECT_TRUE(empty_string_c == null_string);
+  EXPECT_TRUE(null_string_c == empty_string);
+  EXPECT_TRUE(empty_string_c == empty_string);
+  EXPECT_TRUE(null_string_c == deleted_string);
+  EXPECT_TRUE(empty_string_c == deleted_string);
+
+  WideStringView wide_string_c_same1(L"hello");
+  EXPECT_TRUE(wide_string == wide_string_c_same1);
+  EXPECT_TRUE(wide_string_c_same1 == wide_string);
+
+  WideStringView wide_string_c1(L"he");
+  WideStringView wide_string_c2(L"hellp");
+  WideStringView wide_string_c3(L"hellod");
+  EXPECT_FALSE(wide_string == wide_string_c1);
+  EXPECT_FALSE(wide_string == wide_string_c2);
+  EXPECT_FALSE(wide_string == wide_string_c3);
+  EXPECT_FALSE(wide_string_c1 == wide_string);
+  EXPECT_FALSE(wide_string_c2 == wide_string);
+  EXPECT_FALSE(wide_string_c3 == wide_string);
+
+  const wchar_t* c_null_string = nullptr;
+  const wchar_t* c_empty_string = L"";
+  EXPECT_TRUE(null_string == c_null_string);
+  EXPECT_TRUE(null_string == c_empty_string);
+  EXPECT_TRUE(empty_string == c_null_string);
+  EXPECT_TRUE(empty_string == c_empty_string);
+  EXPECT_TRUE(deleted_string == c_null_string);
+  EXPECT_TRUE(deleted_string == c_empty_string);
+  EXPECT_TRUE(c_null_string == null_string);
+  EXPECT_TRUE(c_empty_string == null_string);
+  EXPECT_TRUE(c_null_string == empty_string);
+  EXPECT_TRUE(c_empty_string == empty_string);
+  EXPECT_TRUE(c_null_string == deleted_string);
+  EXPECT_TRUE(c_empty_string == deleted_string);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_TRUE(wide_string == c_string_same1);
+  EXPECT_TRUE(c_string_same1 == wide_string);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_FALSE(wide_string == c_string1);
+  EXPECT_FALSE(wide_string == c_string2);
+  EXPECT_FALSE(wide_string == c_string3);
+  EXPECT_FALSE(c_string1 == wide_string);
+  EXPECT_FALSE(c_string2 == wide_string);
+  EXPECT_FALSE(c_string3 == wide_string);
+}
+
+TEST(WideString, OperatorNE) {
+  WideString null_string;
+  EXPECT_FALSE(null_string != null_string);
+
+  WideString empty_string(L"");
+  EXPECT_FALSE(empty_string != empty_string);
+  EXPECT_FALSE(empty_string != null_string);
+  EXPECT_FALSE(null_string != empty_string);
+
+  WideString deleted_string(L"hello");
+  deleted_string.Delete(0, 5);
+  EXPECT_FALSE(deleted_string != deleted_string);
+  EXPECT_FALSE(deleted_string != null_string);
+  EXPECT_FALSE(deleted_string != empty_string);
+  EXPECT_FALSE(null_string != deleted_string);
+  EXPECT_FALSE(null_string != empty_string);
+
+  WideString wide_string(L"hello");
+  EXPECT_FALSE(wide_string != wide_string);
+  EXPECT_TRUE(wide_string != null_string);
+  EXPECT_TRUE(wide_string != empty_string);
+  EXPECT_TRUE(wide_string != deleted_string);
+  EXPECT_TRUE(null_string != wide_string);
+  EXPECT_TRUE(empty_string != wide_string);
+  EXPECT_TRUE(deleted_string != wide_string);
+
+  WideString wide_string_same1(L"hello");
+  EXPECT_FALSE(wide_string != wide_string_same1);
+  EXPECT_FALSE(wide_string_same1 != wide_string);
+
+  WideString wide_string_same2(wide_string);
+  EXPECT_FALSE(wide_string != wide_string_same2);
+  EXPECT_FALSE(wide_string_same2 != wide_string);
+
+  WideString wide_string1(L"he");
+  WideString wide_string2(L"hellp");
+  WideString wide_string3(L"hellod");
+  EXPECT_TRUE(wide_string != wide_string1);
+  EXPECT_TRUE(wide_string != wide_string2);
+  EXPECT_TRUE(wide_string != wide_string3);
+  EXPECT_TRUE(wide_string1 != wide_string);
+  EXPECT_TRUE(wide_string2 != wide_string);
+  EXPECT_TRUE(wide_string3 != wide_string);
+
+  WideStringView null_string_c;
+  WideStringView empty_string_c(L"");
+  EXPECT_FALSE(null_string != null_string_c);
+  EXPECT_FALSE(null_string != empty_string_c);
+  EXPECT_FALSE(empty_string != null_string_c);
+  EXPECT_FALSE(empty_string != empty_string_c);
+  EXPECT_FALSE(deleted_string != null_string_c);
+  EXPECT_FALSE(deleted_string != empty_string_c);
+  EXPECT_FALSE(null_string_c != null_string);
+  EXPECT_FALSE(empty_string_c != null_string);
+  EXPECT_FALSE(null_string_c != empty_string);
+  EXPECT_FALSE(empty_string_c != empty_string);
+
+  WideStringView wide_string_c_same1(L"hello");
+  EXPECT_FALSE(wide_string != wide_string_c_same1);
+  EXPECT_FALSE(wide_string_c_same1 != wide_string);
+
+  WideStringView wide_string_c1(L"he");
+  WideStringView wide_string_c2(L"hellp");
+  WideStringView wide_string_c3(L"hellod");
+  EXPECT_TRUE(wide_string != wide_string_c1);
+  EXPECT_TRUE(wide_string != wide_string_c2);
+  EXPECT_TRUE(wide_string != wide_string_c3);
+  EXPECT_TRUE(wide_string_c1 != wide_string);
+  EXPECT_TRUE(wide_string_c2 != wide_string);
+  EXPECT_TRUE(wide_string_c3 != wide_string);
+
+  const wchar_t* c_null_string = nullptr;
+  const wchar_t* c_empty_string = L"";
+  EXPECT_FALSE(null_string != c_null_string);
+  EXPECT_FALSE(null_string != c_empty_string);
+  EXPECT_FALSE(empty_string != c_null_string);
+  EXPECT_FALSE(empty_string != c_empty_string);
+  EXPECT_FALSE(deleted_string != c_null_string);
+  EXPECT_FALSE(deleted_string != c_empty_string);
+  EXPECT_FALSE(c_null_string != null_string);
+  EXPECT_FALSE(c_empty_string != null_string);
+  EXPECT_FALSE(c_null_string != empty_string);
+  EXPECT_FALSE(c_empty_string != empty_string);
+  EXPECT_FALSE(c_null_string != deleted_string);
+  EXPECT_FALSE(c_empty_string != deleted_string);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_FALSE(wide_string != c_string_same1);
+  EXPECT_FALSE(c_string_same1 != wide_string);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_TRUE(wide_string != c_string1);
+  EXPECT_TRUE(wide_string != c_string2);
+  EXPECT_TRUE(wide_string != c_string3);
+  EXPECT_TRUE(c_string1 != wide_string);
+  EXPECT_TRUE(c_string2 != wide_string);
+  EXPECT_TRUE(c_string3 != wide_string);
+}
+
+TEST(WideString, ConcatInPlace) {
+  WideString fred;
+  fred.Concat(L"FRED", 4);
+  EXPECT_EQ(L"FRED", fred);
+
+  fred.Concat(L"DY", 2);
+  EXPECT_EQ(L"FREDDY", fred);
+
+  fred.Delete(3, 3);
+  EXPECT_EQ(L"FRE", fred);
+
+  fred.Concat(L"D", 1);
+  EXPECT_EQ(L"FRED", fred);
+
+  WideString copy = fred;
+  fred.Concat(L"DY", 2);
+  EXPECT_EQ(L"FREDDY", fred);
+  EXPECT_EQ(L"FRED", copy);
+}
+
+TEST(WideString, Remove) {
+  WideString freed(L"FREED");
+  freed.Remove(L'E');
+  EXPECT_EQ(L"FRD", freed);
+  freed.Remove(L'F');
+  EXPECT_EQ(L"RD", freed);
+  freed.Remove(L'D');
+  EXPECT_EQ(L"R", freed);
+  freed.Remove(L'X');
+  EXPECT_EQ(L"R", freed);
+  freed.Remove(L'R');
+  EXPECT_EQ(L"", freed);
+
+  WideString empty;
+  empty.Remove(L'X');
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(WideString, RemoveCopies) {
+  WideString freed(L"FREED");
+  const wchar_t* old_buffer = freed.c_str();
+
+  // No change with single reference - no copy.
+  freed.Remove(L'Q');
+  EXPECT_EQ(L"FREED", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+
+  // Change with single reference - no copy.
+  freed.Remove(L'E');
+  EXPECT_EQ(L"FRD", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+
+  // No change with multiple references - no copy.
+  WideString shared(freed);
+  freed.Remove(L'Q');
+  EXPECT_EQ(L"FRD", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+  EXPECT_EQ(old_buffer, shared.c_str());
+
+  // Change with multiple references -- must copy.
+  freed.Remove(L'D');
+  EXPECT_EQ(L"FR", freed);
+  EXPECT_NE(old_buffer, freed.c_str());
+  EXPECT_EQ(L"FRD", shared);
+  EXPECT_EQ(old_buffer, shared.c_str());
+}
+
+TEST(WideString, Replace) {
+  WideString fred(L"FRED");
+  fred.Replace(L"FR", L"BL");
+  EXPECT_EQ(L"BLED", fred);
+  fred.Replace(L"D", L"DDY");
+  EXPECT_EQ(L"BLEDDY", fred);
+  fred.Replace(L"LEDD", L"");
+  EXPECT_EQ(L"BY", fred);
+  fred.Replace(L"X", L"CLAMS");
+  EXPECT_EQ(L"BY", fred);
+  fred.Replace(L"BY", L"HI");
+  EXPECT_EQ(L"HI", fred);
+  fred.Replace(L"", L"CLAMS");
+  EXPECT_EQ(L"HI", fred);
+  fred.Replace(L"HI", L"");
+  EXPECT_EQ(L"", fred);
+}
+
+TEST(WideString, Insert) {
+  WideString fred(L"FRED");
+  EXPECT_EQ(5u, fred.Insert(0, 'S'));
+  EXPECT_EQ(L"SFRED", fred);
+  EXPECT_EQ(6u, fred.Insert(1, 'T'));
+  EXPECT_EQ(L"STFRED", fred);
+  EXPECT_EQ(7u, fred.Insert(4, 'U'));
+  EXPECT_EQ(L"STFRUED", fred);
+  EXPECT_EQ(8u, fred.Insert(7, 'V'));
+  EXPECT_EQ(L"STFRUEDV", fred);
+  EXPECT_EQ(8u, fred.Insert(12, 'P'));
+  EXPECT_EQ(L"STFRUEDV", fred);
+  {
+    WideString empty;
+    EXPECT_EQ(1u, empty.Insert(0, 'X'));
+    EXPECT_EQ(L"X", empty);
+  }
+  {
+    WideString empty;
+    EXPECT_EQ(0u, empty.Insert(5, 'X'));
+    EXPECT_NE(L"X", empty);
+  }
+}
+
+TEST(WideString, InsertAtFrontAndInsertAtBack) {
+  {
+    WideString empty;
+    EXPECT_EQ(1u, empty.InsertAtFront('D'));
+    EXPECT_EQ(L"D", empty);
+    EXPECT_EQ(2u, empty.InsertAtFront('E'));
+    EXPECT_EQ(L"ED", empty);
+    EXPECT_EQ(3u, empty.InsertAtFront('R'));
+    EXPECT_EQ(L"RED", empty);
+    EXPECT_EQ(4u, empty.InsertAtFront('F'));
+    EXPECT_EQ(L"FRED", empty);
+  }
+  {
+    WideString empty;
+    EXPECT_EQ(1u, empty.InsertAtBack('F'));
+    EXPECT_EQ(L"F", empty);
+    EXPECT_EQ(2u, empty.InsertAtBack('R'));
+    EXPECT_EQ(L"FR", empty);
+    EXPECT_EQ(3u, empty.InsertAtBack('E'));
+    EXPECT_EQ(L"FRE", empty);
+    EXPECT_EQ(4u, empty.InsertAtBack('D'));
+    EXPECT_EQ(L"FRED", empty);
+  }
+  {
+    WideString empty;
+    EXPECT_EQ(1u, empty.InsertAtBack('E'));
+    EXPECT_EQ(L"E", empty);
+    EXPECT_EQ(2u, empty.InsertAtFront('R'));
+    EXPECT_EQ(L"RE", empty);
+    EXPECT_EQ(3u, empty.InsertAtBack('D'));
+    EXPECT_EQ(L"RED", empty);
+    EXPECT_EQ(4u, empty.InsertAtFront('F'));
+    EXPECT_EQ(L"FRED", empty);
+  }
+}
+
+TEST(WideString, Delete) {
+  WideString fred(L"FRED");
+  EXPECT_EQ(4u, fred.Delete(0, 0));
+  EXPECT_EQ(L"FRED", fred);
+  EXPECT_EQ(2u, fred.Delete(0, 2));
+  EXPECT_EQ(L"ED", fred);
+  EXPECT_EQ(1u, fred.Delete(1));
+  EXPECT_EQ(L"E", fred);
+  EXPECT_EQ(0u, fred.Delete(0));
+  EXPECT_EQ(L"", fred);
+  EXPECT_EQ(0u, fred.Delete(0));
+  EXPECT_EQ(L"", fred);
+
+  WideString empty;
+  EXPECT_EQ(0u, empty.Delete(0));
+  EXPECT_EQ(L"", empty);
+  EXPECT_EQ(0u, empty.Delete(1));
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(WideString, Mid) {
+  WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Mid(0, 0));
+  EXPECT_EQ(L"", fred.Mid(3, 0));
+  EXPECT_EQ(L"FRED", fred.Mid(0, 4));
+  EXPECT_EQ(L"RED", fred.Mid(1, 3));
+  EXPECT_EQ(L"ED", fred.Mid(2, 2));
+  EXPECT_EQ(L"D", fred.Mid(3, 1));
+  EXPECT_EQ(L"F", fred.Mid(0, 1));
+  EXPECT_EQ(L"R", fred.Mid(1, 1));
+  EXPECT_EQ(L"E", fred.Mid(2, 1));
+  EXPECT_EQ(L"D", fred.Mid(3, 1));
+  EXPECT_EQ(L"FR", fred.Mid(0, 2));
+  EXPECT_EQ(L"FRED", fred.Mid(0, 4));
+  EXPECT_EQ(L"", fred.Mid(0, 10));
+
+  EXPECT_EQ(L"", fred.Mid(1, 4));
+  EXPECT_EQ(L"", fred.Mid(4, 1));
+
+  WideString empty;
+  EXPECT_EQ(L"", empty.Mid(0, 0));
+}
+
+TEST(WideString, Left) {
+  WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Left(0));
+  EXPECT_EQ(L"F", fred.Left(1));
+  EXPECT_EQ(L"FR", fred.Left(2));
+  EXPECT_EQ(L"FRE", fred.Left(3));
+  EXPECT_EQ(L"FRED", fred.Left(4));
+
+  EXPECT_EQ(L"", fred.Left(5));
+
+  WideString empty;
+  EXPECT_EQ(L"", empty.Left(0));
+  EXPECT_EQ(L"", empty.Left(1));
+}
+
+TEST(WideString, Right) {
+  WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Right(0));
+  EXPECT_EQ(L"D", fred.Right(1));
+  EXPECT_EQ(L"ED", fred.Right(2));
+  EXPECT_EQ(L"RED", fred.Right(3));
+  EXPECT_EQ(L"FRED", fred.Right(4));
+
+  EXPECT_EQ(L"", fred.Right(5));
+
+  WideString empty;
+  EXPECT_EQ(L"", empty.Right(0));
+  EXPECT_EQ(L"", empty.Right(1));
+}
+
+TEST(WideString, Find) {
+  WideString null_string;
+  EXPECT_FALSE(null_string.Find(L'a').has_value());
+  EXPECT_FALSE(null_string.Find(L'\0').has_value());
+
+  WideString empty_string(L"");
+  EXPECT_FALSE(empty_string.Find(L'a').has_value());
+  EXPECT_FALSE(empty_string.Find(L'\0').has_value());
+
+  pdfium::Optional<FX_STRSIZE> result;
+  WideString single_string(L"a");
+  result = single_string.Find(L'a');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(0u, result.value());
+  EXPECT_FALSE(single_string.Find(L'b').has_value());
+  EXPECT_FALSE(single_string.Find(L'\0').has_value());
+
+  WideString longer_string(L"abccc");
+  result = longer_string.Find(L'a');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(0u, result.value());
+  result = longer_string.Find(L'c');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(2u, result.value());
+  result = longer_string.Find(L'c', 3);
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(3u, result.value());
+  EXPECT_FALSE(longer_string.Find(L'\0').has_value());
+
+  result = longer_string.Find(L"ab");
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(0u, result.value());
+  result = longer_string.Find(L"ccc");
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(2u, result.value());
+  result = longer_string.Find(L"cc", 3);
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(3u, result.value());
+  EXPECT_FALSE(longer_string.Find(L"d").has_value());
+
+  WideString hibyte_string(
+      L"ab\xff8c"
+      L"def");
+  result = hibyte_string.Find(L'\xff8c');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(2u, result.value());
+}
+
+TEST(WideString, UpperLower) {
+  WideString fred(L"F-Re.42D");
+  fred.MakeLower();
+  EXPECT_EQ(L"f-re.42d", fred);
+  fred.MakeUpper();
+  EXPECT_EQ(L"F-RE.42D", fred);
+
+  WideString empty;
+  empty.MakeLower();
+  EXPECT_EQ(L"", empty);
+  empty.MakeUpper();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(WideString, TrimRight) {
+  WideString fred(L"  FRED  ");
+  fred.TrimRight();
+  EXPECT_EQ(L"  FRED", fred);
+  fred.TrimRight(L'E');
+  EXPECT_EQ(L"  FRED", fred);
+  fred.TrimRight(L'D');
+  EXPECT_EQ(L"  FRE", fred);
+  fred.TrimRight(L"ERP");
+  EXPECT_EQ(L"  F", fred);
+
+  WideString blank(L"   ");
+  blank.TrimRight(L"ERP");
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimRight(L'E');
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimRight();
+  EXPECT_EQ(L"", blank);
+
+  WideString empty;
+  empty.TrimRight(L"ERP");
+  EXPECT_EQ(L"", empty);
+  empty.TrimRight(L'E');
+  EXPECT_EQ(L"", empty);
+  empty.TrimRight();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(WideString, TrimRightCopies) {
+  {
+    // With a single reference, no copy takes place.
+    WideString fred(L"  FRED  ");
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"  FRED", fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, we must copy.
+    WideString fred(L"  FRED  ");
+    WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"  FRED", fred);
+    EXPECT_EQ(L"  FRED  ", other_fred);
+    EXPECT_NE(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, but no modifications, no copy.
+    WideString fred(L"FRED");
+    WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"FRED", fred);
+    EXPECT_EQ(L"FRED", other_fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+}
+
+TEST(WideString, TrimLeft) {
+  WideString fred(L"  FRED  ");
+  fred.TrimLeft();
+  EXPECT_EQ(L"FRED  ", fred);
+  fred.TrimLeft(L'E');
+  EXPECT_EQ(L"FRED  ", fred);
+  fred.TrimLeft(L'F');
+  EXPECT_EQ(L"RED  ", fred);
+  fred.TrimLeft(L"ERP");
+  EXPECT_EQ(L"D  ", fred);
+
+  WideString blank(L"   ");
+  blank.TrimLeft(L"ERP");
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimLeft(L'E');
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimLeft();
+  EXPECT_EQ(L"", blank);
+
+  WideString empty;
+  empty.TrimLeft(L"ERP");
+  EXPECT_EQ(L"", empty);
+  empty.TrimLeft(L'E');
+  EXPECT_EQ(L"", empty);
+  empty.TrimLeft();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(WideString, TrimLeftCopies) {
+  {
+    // With a single reference, no copy takes place.
+    WideString fred(L"  FRED  ");
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED  ", fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, we must copy.
+    WideString fred(L"  FRED  ");
+    WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED  ", fred);
+    EXPECT_EQ(L"  FRED  ", other_fred);
+    EXPECT_NE(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, but no modifications, no copy.
+    WideString fred(L"FRED");
+    WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED", fred);
+    EXPECT_EQ(L"FRED", other_fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+}
+
+TEST(WideString, Reserve) {
+  {
+    WideString str;
+    str.Reserve(6);
+    const wchar_t* old_buffer = str.c_str();
+    str += L"ABCDEF";
+    EXPECT_EQ(old_buffer, str.c_str());
+    str += L"Blah Blah Blah Blah Blah Blah";
+    EXPECT_NE(old_buffer, str.c_str());
+  }
+  {
+    WideString str(L"A");
+    str.Reserve(6);
+    const wchar_t* old_buffer = str.c_str();
+    str += L"BCDEF";
+    EXPECT_EQ(old_buffer, str.c_str());
+    str += L"Blah Blah Blah Blah Blah Blah";
+    EXPECT_NE(old_buffer, str.c_str());
+  }
+}
+
+TEST(WideString, GetBuffer) {
+  {
+    WideString str;
+    wchar_t* buffer = str.GetBuffer(12);
+    wcscpy(buffer, L"clams");
+    str.ReleaseBuffer(str.GetStringLength());
+    EXPECT_EQ(L"clams", str);
+  }
+  {
+    WideString str(L"cl");
+    wchar_t* buffer = str.GetBuffer(12);
+    wcscpy(buffer + 2, L"ams");
+    str.ReleaseBuffer(str.GetStringLength());
+    EXPECT_EQ(L"clams", str);
+  }
+}
+
+TEST(WideString, ReleaseBuffer) {
+  {
+    WideString str;
+    str.Reserve(12);
+    str += L"clams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_EQ(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    WideString str(L"c");
+    str.Reserve(12);
+    str += L"lams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_EQ(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    WideString str;
+    str.Reserve(200);
+    str += L"clams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_NE(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    WideString str(L"c");
+    str.Reserve(200);
+    str += L"lams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_NE(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+}
+
+TEST(WideString, EmptyReverseIterator) {
+  WideString empty;
+  auto iter = empty.rbegin();
+  EXPECT_TRUE(iter == empty.rend());
+  EXPECT_FALSE(iter != empty.rend());
+  EXPECT_FALSE(iter < empty.rend());
+}
+
+TEST(WideString, OneCharReverseIterator) {
+  WideString one_str(L"a");
+  auto iter = one_str.rbegin();
+  EXPECT_FALSE(iter == one_str.rend());
+  EXPECT_TRUE(iter != one_str.rend());
+  EXPECT_TRUE(iter < one_str.rend());
+
+  char ch = *iter++;
+  EXPECT_EQ('a', ch);
+  EXPECT_TRUE(iter == one_str.rend());
+  EXPECT_FALSE(iter != one_str.rend());
+  EXPECT_FALSE(iter < one_str.rend());
+}
+
+TEST(WideString, MultiCharReverseIterator) {
+  WideString multi_str(L"abcd");
+  auto iter = multi_str.rbegin();
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  char ch = *iter++;
+  EXPECT_EQ('d', ch);
+  EXPECT_EQ('c', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *(++iter);
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('b', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter++;
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('a', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter++;
+  EXPECT_EQ('a', ch);
+  EXPECT_TRUE(iter == multi_str.rend());
+
+  ch = *(--iter);
+  EXPECT_EQ('a', ch);
+  EXPECT_EQ('a', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter--;
+  EXPECT_EQ('a', ch);
+  EXPECT_EQ('b', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter--;
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('c', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *(--iter);
+  EXPECT_EQ('d', ch);
+  EXPECT_EQ('d', *iter);
+  EXPECT_TRUE(iter == multi_str.rbegin());
+}
+
+TEST(WideString, UTF16LE_Encode) {
+  struct UTF16LEEncodeCase {
+    WideString ws;
+    ByteString bs;
+  } utf16le_encode_cases[] = {
+      {L"", ByteString("\0\0", 2)},
+      {L"abc", ByteString("a\0b\0c\0\0\0", 8)},
+      {L"abcdef", ByteString("a\0b\0c\0d\0e\0f\0\0\0", 14)},
+      {L"abc\0def", ByteString("a\0b\0c\0\0\0", 8)},
+      {L"\xaabb\xccdd", ByteString("\xbb\xaa\xdd\xcc\0\0", 6)},
+      {L"\x3132\x6162", ByteString("\x32\x31\x62\x61\0\0", 6)},
+  };
+
+  for (size_t i = 0; i < FX_ArraySize(utf16le_encode_cases); ++i) {
+    EXPECT_EQ(utf16le_encode_cases[i].bs,
+              utf16le_encode_cases[i].ws.UTF16LE_Encode())
+        << " for case number " << i;
+  }
+}
+
+TEST(WideStringView, FromVector) {
+  std::vector<WideStringView::UnsignedType> null_vec;
+  WideStringView null_string(null_vec);
+  EXPECT_EQ(0u, null_string.GetLength());
+
+  std::vector<WideStringView::UnsignedType> lower_a_vec(
+      10, static_cast<WideStringView::UnsignedType>(L'a'));
+  WideStringView lower_a_string(lower_a_vec);
+  EXPECT_EQ(10u, lower_a_string.GetLength());
+  EXPECT_EQ(L"aaaaaaaaaa", lower_a_string);
+
+  std::vector<WideStringView::UnsignedType> cleared_vec;
+  cleared_vec.push_back(42);
+  cleared_vec.pop_back();
+  WideStringView cleared_string(cleared_vec);
+  EXPECT_EQ(0u, cleared_string.GetLength());
+  EXPECT_EQ(nullptr, cleared_string.raw_str());
+}
+
+TEST(WideStringView, ElementAccess) {
+  WideStringView abc(L"abc");
+  EXPECT_EQ(L'a', static_cast<wchar_t>(abc[0]));
+  EXPECT_EQ(L'b', static_cast<wchar_t>(abc[1]));
+  EXPECT_EQ(L'c', static_cast<wchar_t>(abc[2]));
+#ifndef NDEBUG
+  EXPECT_DEATH({ abc[4]; }, ".*");
+#endif
+}
+
+TEST(WideStringView, OperatorLT) {
+  WideStringView empty;
+  WideStringView a(L"a");
+  WideStringView abc(L"\x0110qq");  // Comes InsertAtFront despite endianness.
+  WideStringView def(L"\x1001qq");  // Comes InsertAtBack despite endianness.
+
+  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(WideStringView, OperatorEQ) {
+  WideStringView wide_string_c(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_c);
+
+  WideStringView wide_string_c_same1(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_c_same1);
+  EXPECT_TRUE(wide_string_c_same1 == wide_string_c);
+
+  WideStringView wide_string_c_same2(wide_string_c);
+  EXPECT_TRUE(wide_string_c == wide_string_c_same2);
+  EXPECT_TRUE(wide_string_c_same2 == wide_string_c);
+
+  WideStringView wide_string_c1(L"he");
+  WideStringView wide_string_c2(L"hellp");
+  WideStringView wide_string_c3(L"hellod");
+  EXPECT_FALSE(wide_string_c == wide_string_c1);
+  EXPECT_FALSE(wide_string_c == wide_string_c2);
+  EXPECT_FALSE(wide_string_c == wide_string_c3);
+  EXPECT_FALSE(wide_string_c1 == wide_string_c);
+  EXPECT_FALSE(wide_string_c2 == wide_string_c);
+  EXPECT_FALSE(wide_string_c3 == wide_string_c);
+
+  WideString wide_string_same1(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_same1);
+  EXPECT_TRUE(wide_string_same1 == wide_string_c);
+
+  WideString wide_string1(L"he");
+  WideString wide_string2(L"hellp");
+  WideString wide_string3(L"hellod");
+  EXPECT_FALSE(wide_string_c == wide_string1);
+  EXPECT_FALSE(wide_string_c == wide_string2);
+  EXPECT_FALSE(wide_string_c == wide_string3);
+  EXPECT_FALSE(wide_string1 == wide_string_c);
+  EXPECT_FALSE(wide_string2 == wide_string_c);
+  EXPECT_FALSE(wide_string3 == wide_string_c);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_TRUE(wide_string_c == c_string_same1);
+  EXPECT_TRUE(c_string_same1 == wide_string_c);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_FALSE(wide_string_c == c_string1);
+  EXPECT_FALSE(wide_string_c == c_string2);
+  EXPECT_FALSE(wide_string_c == c_string3);
+
+  EXPECT_FALSE(c_string1 == wide_string_c);
+  EXPECT_FALSE(c_string2 == wide_string_c);
+  EXPECT_FALSE(c_string3 == wide_string_c);
+}
+
+TEST(WideStringView, OperatorNE) {
+  WideStringView wide_string_c(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_c);
+
+  WideStringView wide_string_c_same1(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_c_same1);
+  EXPECT_FALSE(wide_string_c_same1 != wide_string_c);
+
+  WideStringView wide_string_c_same2(wide_string_c);
+  EXPECT_FALSE(wide_string_c != wide_string_c_same2);
+  EXPECT_FALSE(wide_string_c_same2 != wide_string_c);
+
+  WideStringView wide_string_c1(L"he");
+  WideStringView wide_string_c2(L"hellp");
+  WideStringView wide_string_c3(L"hellod");
+  EXPECT_TRUE(wide_string_c != wide_string_c1);
+  EXPECT_TRUE(wide_string_c != wide_string_c2);
+  EXPECT_TRUE(wide_string_c != wide_string_c3);
+  EXPECT_TRUE(wide_string_c1 != wide_string_c);
+  EXPECT_TRUE(wide_string_c2 != wide_string_c);
+  EXPECT_TRUE(wide_string_c3 != wide_string_c);
+
+  WideString wide_string_same1(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_same1);
+  EXPECT_FALSE(wide_string_same1 != wide_string_c);
+
+  WideString wide_string1(L"he");
+  WideString wide_string2(L"hellp");
+  WideString wide_string3(L"hellod");
+  EXPECT_TRUE(wide_string_c != wide_string1);
+  EXPECT_TRUE(wide_string_c != wide_string2);
+  EXPECT_TRUE(wide_string_c != wide_string3);
+  EXPECT_TRUE(wide_string1 != wide_string_c);
+  EXPECT_TRUE(wide_string2 != wide_string_c);
+  EXPECT_TRUE(wide_string3 != wide_string_c);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_FALSE(wide_string_c != c_string_same1);
+  EXPECT_FALSE(c_string_same1 != wide_string_c);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_TRUE(wide_string_c != c_string1);
+  EXPECT_TRUE(wide_string_c != c_string2);
+  EXPECT_TRUE(wide_string_c != c_string3);
+
+  EXPECT_TRUE(c_string1 != wide_string_c);
+  EXPECT_TRUE(c_string2 != wide_string_c);
+  EXPECT_TRUE(c_string3 != wide_string_c);
+}
+
+TEST(WideStringView, Find) {
+  WideStringView null_string;
+  EXPECT_FALSE(null_string.Find(L'a').has_value());
+  EXPECT_FALSE(null_string.Find(L'\0').has_value());
+
+  WideStringView empty_string(L"");
+  EXPECT_FALSE(empty_string.Find(L'a').has_value());
+  EXPECT_FALSE(empty_string.Find(L'\0').has_value());
+
+  pdfium::Optional<FX_STRSIZE> result;
+  WideStringView single_string(L"a");
+  result = single_string.Find(L'a');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(0u, result.value());
+  EXPECT_FALSE(single_string.Find(L'b').has_value());
+  EXPECT_FALSE(single_string.Find(L'\0').has_value());
+
+  WideStringView longer_string(L"abccc");
+  result = longer_string.Find(L'a');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(0u, result.value());
+  result = longer_string.Find(L'c');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(2u, result.value());
+  EXPECT_FALSE(longer_string.Find(L'd').has_value());
+  EXPECT_FALSE(longer_string.Find(L'\0').has_value());
+
+  WideStringView hibyte_string(
+      L"ab\xFF8c"
+      L"def");
+  result = hibyte_string.Find(L'\xFF8c');
+  ASSERT_TRUE(result.has_value());
+  EXPECT_EQ(2u, result.value());
+}
+
+TEST(WideStringView, NullIterator) {
+  WideStringView null_str;
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : null_str) {
+    sum += c;  // Avoid unused arg warnings.
+    any_present = true;
+  }
+  EXPECT_FALSE(any_present);
+  EXPECT_EQ(0, sum);
+}
+
+TEST(WideStringView, EmptyIterator) {
+  WideStringView empty_str(L"");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : empty_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_FALSE(any_present);
+  EXPECT_EQ(0, sum);
+}
+
+TEST(WideStringView, OneCharIterator) {
+  WideStringView one_str(L"a");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : one_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_TRUE(any_present);
+  EXPECT_EQ(static_cast<int32_t>(L'a'), sum);
+}
+
+TEST(WideStringView, MultiCharIterator) {
+  WideStringView one_str(L"abc");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : one_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_TRUE(any_present);
+  EXPECT_EQ(static_cast<int32_t>(L'a' + L'b' + L'c'), sum);
+}
+
+TEST(WideStringView, EmptyReverseIterator) {
+  WideStringView empty;
+  auto iter = empty.rbegin();
+  EXPECT_TRUE(iter == empty.rend());
+  EXPECT_FALSE(iter != empty.rend());
+  EXPECT_FALSE(iter < empty.rend());
+}
+
+TEST(WideStringView, OneCharReverseIterator) {
+  WideStringView one_str(L"a");
+  auto iter = one_str.rbegin();
+  EXPECT_FALSE(iter == one_str.rend());
+  EXPECT_TRUE(iter != one_str.rend());
+  EXPECT_TRUE(iter < one_str.rend());
+
+  char ch = *iter++;
+  EXPECT_EQ('a', ch);
+  EXPECT_TRUE(iter == one_str.rend());
+  EXPECT_FALSE(iter != one_str.rend());
+  EXPECT_FALSE(iter < one_str.rend());
+}
+
+TEST(WideStringView, MultiCharReverseIterator) {
+  WideStringView multi_str(L"abcd");
+  auto iter = multi_str.rbegin();
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  char ch = *iter++;
+  EXPECT_EQ('d', ch);
+  EXPECT_EQ('c', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *(++iter);
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('b', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter++;
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('a', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter++;
+  EXPECT_EQ('a', ch);
+  EXPECT_TRUE(iter == multi_str.rend());
+
+  ch = *(--iter);
+  EXPECT_EQ('a', ch);
+  EXPECT_EQ('a', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter--;
+  EXPECT_EQ('a', ch);
+  EXPECT_EQ('b', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *iter--;
+  EXPECT_EQ('b', ch);
+  EXPECT_EQ('c', *iter);
+  EXPECT_FALSE(iter == multi_str.rend());
+
+  ch = *(--iter);
+  EXPECT_EQ('d', ch);
+  EXPECT_EQ('d', *iter);
+  EXPECT_TRUE(iter == multi_str.rbegin());
+}
+
+TEST(WideStringView, AnyAllNoneOf) {
+  WideStringView str(L"aaaaaaaaaaaaaaaaab");
+  EXPECT_FALSE(std::all_of(str.begin(), str.end(),
+                           [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_FALSE(std::none_of(str.begin(), str.end(),
+                            [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_TRUE(std::any_of(str.begin(), str.end(),
+                          [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_TRUE(pdfium::ContainsValue(str, L'a'));
+  EXPECT_TRUE(pdfium::ContainsValue(str, L'b'));
+  EXPECT_FALSE(pdfium::ContainsValue(str, L'z'));
+}
+
+TEST(WideStringView, TrimmedRight) {
+  WideStringView fred(L"FRED");
+  EXPECT_EQ(L"FRED", fred.TrimmedRight(L'E'));
+  EXPECT_EQ(L"FRE", fred.TrimmedRight(L'D'));
+  WideStringView fredd(L"FREDD");
+  EXPECT_EQ(L"FRE", fred.TrimmedRight(L'D'));
+}
+
+TEST(WideString, FormatWidth) {
+  {
+    WideString str;
+    str.Format(L"%5d", 1);
+    EXPECT_EQ(L"    1", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%*d", 5, 1);
+    EXPECT_EQ(L"    1", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%-1d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%0d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%1048576d", 1);
+    EXPECT_EQ(L"", str);
+  }
+}
+
+TEST(WideString, FormatPrecision) {
+  {
+    WideString str;
+    str.Format(L"%.2f", 1.12345);
+    EXPECT_EQ(L"1.12", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%.*f", 3, 1.12345);
+    EXPECT_EQ(L"1.123", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%-1f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%0f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    WideString str;
+    str.Format(L"%.1048576f", 1.2);
+    EXPECT_EQ(L"", str);
+  }
+}
+
+TEST(WideString, FormatOutOfRangeChar) {
+  WideString str;
+  str.Format(L"unsupported char '%c'", 0x00FF00FF);
+}
+
+TEST(WideString, Empty) {
+  WideString empty_str;
+  EXPECT_TRUE(empty_str.IsEmpty());
+  EXPECT_EQ(0u, empty_str.GetLength());
+  const wchar_t* cstr = empty_str.c_str();
+  EXPECT_EQ(0u, FXSYS_wcslen(cstr));
+}
+
+TEST(CFX_WidString, InitializerList) {
+  WideString many_str({L"clams", L" and ", L"oysters"});
+  EXPECT_EQ(L"clams and oysters", many_str);
+  many_str = {L"fish", L" and ", L"chips", L" and ", L"soda"};
+  EXPECT_EQ(L"fish and chips and soda", many_str);
+}
+
+TEST(WideString, NullIterator) {
+  WideString null_str;
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : null_str) {
+    sum += c;  // Avoid unused arg warnings.
+    any_present = true;
+  }
+  EXPECT_FALSE(any_present);
+  EXPECT_EQ(0, sum);
+}
+
+TEST(WideString, EmptyIterator) {
+  WideString empty_str(L"");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : empty_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_FALSE(any_present);
+  EXPECT_EQ(0, sum);
+}
+
+TEST(WideString, OneCharIterator) {
+  WideString one_str(L"a");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : one_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_TRUE(any_present);
+  EXPECT_EQ(static_cast<int32_t>(L'a'), sum);
+}
+
+TEST(WideString, MultiCharIterator) {
+  WideString one_str(L"abc");
+  int32_t sum = 0;
+  bool any_present = false;
+  for (const auto& c : one_str) {
+    any_present = true;
+    sum += c;  // Avoid unused arg warnings.
+  }
+  EXPECT_TRUE(any_present);
+  EXPECT_EQ(static_cast<int32_t>(L'a' + L'b' + L'c'), sum);
+}
+
+TEST(WideString, AnyAllNoneOf) {
+  WideString str(L"aaaaaaaaaaaaaaaaab");
+  EXPECT_FALSE(std::all_of(str.begin(), str.end(),
+                           [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_FALSE(std::none_of(str.begin(), str.end(),
+                            [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_TRUE(std::any_of(str.begin(), str.end(),
+                          [](const wchar_t& c) { return c == L'a'; }));
+
+  EXPECT_TRUE(pdfium::ContainsValue(str, L'a'));
+  EXPECT_TRUE(pdfium::ContainsValue(str, L'b'));
+  EXPECT_FALSE(pdfium::ContainsValue(str, L'z'));
+}
+
+TEST(WideString, OStreamOverload) {
+  std::ostringstream stream;
+
+  // Basic case, empty string
+  WideString str;
+  stream << str;
+  EXPECT_EQ("", stream.str());
+
+  // Basic case, wide character
+  str = L"\u20AC";
+  stream << str;
+  EXPECT_EQ("\u20AC", stream.str());
+
+  // Basic case, non-empty string
+  str = L"def";
+  stream.str("");
+  stream << "abc" << str << "ghi";
+  EXPECT_EQ("abcdefghi", stream.str());
+
+  // Changing the WideString does not change the stream it was written to.
+  str = L"123";
+  EXPECT_EQ("abcdefghi", stream.str());
+
+  // Writing it again to the stream will use the latest value.
+  stream.str("");
+  stream << "abc" << str << "ghi";
+  EXPECT_EQ("abc123ghi", stream.str());
+
+  wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+
+  // Writing a WideString with nulls and no specified length treats it as
+  // a C-style null-terminated string.
+  str = WideString(stringWithNulls);
+  EXPECT_EQ(2u, str.GetLength());
+  stream.str("");
+  stream << str;
+  EXPECT_EQ(2u, stream.tellp());
+
+  // Writing a WideString with nulls but specifying its length treats it as
+  // a C++-style string.
+  str = WideString(stringWithNulls, 4);
+  EXPECT_EQ(4u, str.GetLength());
+  stream.str("");
+  stream << str;
+  EXPECT_EQ(4u, stream.tellp());
+
+  // << operators can be chained.
+  WideString str1(L"abc");
+  WideString str2(L"def");
+  stream.str("");
+  stream << str1 << str2;
+  EXPECT_EQ("abcdef", stream.str());
+}
+
+TEST(WideString, WideOStreamOverload) {
+  std::wostringstream stream;
+
+  // Basic case, empty string
+  WideString str;
+  stream << str;
+  EXPECT_EQ(L"", stream.str());
+
+  // Basic case, wide character
+  str = L"\u20AC";
+  stream << str;
+  EXPECT_EQ(L"\u20AC", stream.str());
+
+  // Basic case, non-empty string
+  str = L"def";
+  stream.str(L"");
+  stream << L"abc" << str << L"ghi";
+  EXPECT_EQ(L"abcdefghi", stream.str());
+
+  // Changing the WideString does not change the stream it was written to.
+  str = L"123";
+  EXPECT_EQ(L"abcdefghi", stream.str());
+
+  // Writing it again to the stream will use the latest value.
+  stream.str(L"");
+  stream << L"abc" << str << L"ghi";
+  EXPECT_EQ(L"abc123ghi", stream.str());
+
+  wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+
+  // Writing a WideString with nulls and no specified length treats it as
+  // a C-style null-terminated string.
+  str = WideString(stringWithNulls);
+  EXPECT_EQ(2u, str.GetLength());
+  stream.str(L"");
+  stream << str;
+  EXPECT_EQ(2u, stream.tellp());
+
+  // Writing a WideString with nulls but specifying its length treats it as
+  // a C++-style string.
+  str = WideString(stringWithNulls, 4);
+  EXPECT_EQ(4u, str.GetLength());
+  stream.str(L"");
+  stream << str;
+  EXPECT_EQ(4u, stream.tellp());
+
+  // << operators can be chained.
+  WideString str1(L"abc");
+  WideString str2(L"def");
+  stream.str(L"");
+  stream << str1 << str2;
+  EXPECT_EQ(L"abcdef", stream.str());
+}
+
+TEST(WideStringView, OStreamOverload) {
+  // Basic case, empty string
+  {
+    std::ostringstream stream;
+    WideStringView str;
+    stream << str;
+    EXPECT_EQ("", stream.str());
+  }
+
+  // Basic case, non-empty string
+  {
+    std::ostringstream stream;
+    WideStringView str(L"def");
+    stream << "abc" << str << "ghi";
+    EXPECT_EQ("abcdefghi", stream.str());
+  }
+
+  // Basic case, wide character
+  {
+    std::ostringstream stream;
+    WideStringView str(L"\u20AC");
+    stream << str;
+    EXPECT_EQ("\u20AC", stream.str());
+  }
+
+  // Changing the WideStringView does not change the stream it was written to.
+  {
+    std::ostringstream stream;
+    WideStringView str(L"abc");
+    stream << str;
+    str = L"123";
+    EXPECT_EQ("abc", stream.str());
+  }
+
+  // Writing it again to the stream will use the latest value.
+  {
+    std::ostringstream stream;
+    WideStringView str(L"abc");
+    stream << str;
+    stream.str("");
+    str = L"123";
+    stream << str;
+    EXPECT_EQ("123", stream.str());
+  }
+
+  // Writing a WideStringView with nulls and no specified length treats it as
+  // a C-style null-terminated string.
+  {
+    wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+    std::ostringstream stream;
+    WideStringView str(stringWithNulls);
+    EXPECT_EQ(2u, str.GetLength());
+    stream << str;
+    EXPECT_EQ(2u, stream.tellp());
+    str = L"";
+  }
+
+  // Writing a WideStringView with nulls but specifying its length treats it as
+  // a C++-style string.
+  {
+    wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+    std::ostringstream stream;
+    WideStringView str(stringWithNulls, 4);
+    EXPECT_EQ(4u, str.GetLength());
+    stream << str;
+    EXPECT_EQ(4u, stream.tellp());
+    str = L"";
+  }
+
+  // << operators can be chained.
+  {
+    std::ostringstream stream;
+    WideStringView str1(L"abc");
+    WideStringView str2(L"def");
+    stream << str1 << str2;
+    EXPECT_EQ("abcdef", stream.str());
+  }
+}
+
+TEST(WideStringView, WideOStreamOverload) {
+  // Basic case, empty string
+  {
+    std::wostringstream stream;
+    WideStringView str;
+    stream << str;
+    EXPECT_EQ(L"", stream.str());
+  }
+
+  // Basic case, non-empty string
+  {
+    std::wostringstream stream;
+    WideStringView str(L"def");
+    stream << "abc" << str << "ghi";
+    EXPECT_EQ(L"abcdefghi", stream.str());
+  }
+
+  // Basic case, wide character
+  {
+    std::wostringstream stream;
+    WideStringView str(L"\u20AC");
+    stream << str;
+    EXPECT_EQ(L"\u20AC", stream.str());
+  }
+
+  // Changing the WideStringView does not change the stream it was written to.
+  {
+    std::wostringstream stream;
+    WideStringView str(L"abc");
+    stream << str;
+    str = L"123";
+    EXPECT_EQ(L"abc", stream.str());
+  }
+
+  // Writing it again to the stream will use the latest value.
+  {
+    std::wostringstream stream;
+    WideStringView str(L"abc");
+    stream << str;
+    stream.str(L"");
+    str = L"123";
+    stream << str;
+    EXPECT_EQ(L"123", stream.str());
+  }
+
+  // Writing a WideStringView with nulls and no specified length treats it as
+  // a C-style null-terminated string.
+  {
+    wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+    std::wostringstream stream;
+    WideStringView str(stringWithNulls);
+    EXPECT_EQ(2u, str.GetLength());
+    stream << str;
+    EXPECT_EQ(2u, stream.tellp());
+  }
+
+  // Writing a WideStringView with nulls but specifying its length treats it as
+  // a C++-style string.
+  {
+    wchar_t stringWithNulls[]{'x', 'y', '\0', 'z'};
+    std::wostringstream stream;
+    WideStringView str(stringWithNulls, 4);
+    EXPECT_EQ(4u, str.GetLength());
+    stream << str;
+    EXPECT_EQ(4u, stream.tellp());
+  }
+
+  // << operators can be chained.
+  {
+    std::wostringstream stream;
+    WideStringView str1(L"abc");
+    WideStringView str2(L"def");
+    stream << str1 << str2;
+    EXPECT_EQ(L"abcdef", stream.str());
+  }
+}