Reland "Cleanup some numeric code.""

core/src/fxcrt/fx_extension_unittest.cpp

Index: core/src/fxcrt/fx_extension_unittest.cpp
diff --git a/core/src/fxcrt/fx_extension_unittest.cpp b/core/src/fxcrt/fx_extension_unittest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b12dcbe07f405fefea2e375018e85475cf6b9f9c
--- /dev/null
+++ b/core/src/fxcrt/fx_extension_unittest.cpp
@@ -0,0 +1,24 @@
+// 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'));
+}