Reland "Cleanup some numeric code.""

core/src/fxcrt/fx_extension_unittest.cpp

+// Copyright 2015 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 "core/include/fxcrt/fx_ext.h"
+
+TEST(fxcrt, FXSYS_toHexDigit) {
+  EXPECT_EQ(10, FXSYS_toHexDigit('a'));
+  EXPECT_EQ(10, FXSYS_toHexDigit('A'));
+  EXPECT_EQ(7, FXSYS_toHexDigit('7'));
+  EXPECT_EQ(0, FXSYS_toHexDigit('i'));
+}
+
+TEST(fxcrt, FXSYS_toDecimalDigit) {
+  EXPECT_EQ(7, FXSYS_toDecimalDigit('7'));
+  EXPECT_EQ(0, FXSYS_toDecimalDigit('a'));
+}
+
+TEST(fxcrt, FXSYS_toDecimalDigitWide) {
+  EXPECT_EQ(7, FXSYS_toDecimalDigitWide(L'7'));
+  EXPECT_EQ(0, FXSYS_toDecimalDigitWide(L'a'));
+}