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diff --git a/unittests/Support/LocaleTest.cpp b/unittests/Support/LocaleTest.cpp
new file mode 100644
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+++ b/unittests/Support/LocaleTest.cpp
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+//===- unittests/Support/LocaleTest.cpp - Locale.h tests ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Locale.h"
+#include "gtest/gtest.h"
+
+namespace llvm {
+namespace sys {
+namespace locale {
+namespace {
+
+// FIXME: WIN32 implementation is incorrect. We should consider using the one
+// from LocaleGeneric.inc for WIN32.
+#ifndef _WIN32
+TEST(Locale, columnWidth) {
+  // FIXME: This test fails with MacOSX implementation of columnWidth.
+#ifndef __APPLE__
+  EXPECT_EQ(0, columnWidth(""));
+  EXPECT_EQ(1, columnWidth(" "));
+  EXPECT_EQ(1, columnWidth("a"));
+  EXPECT_EQ(1, columnWidth("~"));
+
+  EXPECT_EQ(6, columnWidth("abcdef"));
+
+  EXPECT_EQ(-1, columnWidth("\x01"));
+  EXPECT_EQ(-1, columnWidth("aaaaaaaaaa\x01"));
+  EXPECT_EQ(-1, columnWidth("\342\200\213")); // 200B ZERO WIDTH SPACE
+
+  EXPECT_EQ(0, columnWidth("\314\200")); // 0300 COMBINING GRAVE ACCENT
+  EXPECT_EQ(1, columnWidth("\340\270\201")); // 0E01 THAI CHARACTER KO KAI
+  EXPECT_EQ(2, columnWidth("\344\270\200")); // CJK UNIFIED IDEOGRAPH-4E00
+
+  EXPECT_EQ(4, columnWidth("\344\270\200\344\270\200"));
+  EXPECT_EQ(3, columnWidth("q\344\270\200"));
+  EXPECT_EQ(3, columnWidth("\314\200\340\270\201\344\270\200"));
+
+  // Invalid UTF-8 strings, columnWidth should error out.
+  EXPECT_EQ(-2, columnWidth("\344"));
+  EXPECT_EQ(-2, columnWidth("\344\270"));
+  EXPECT_EQ(-2, columnWidth("\344\270\033"));
+  EXPECT_EQ(-2, columnWidth("\344\270\300"));
+  EXPECT_EQ(-2, columnWidth("\377\366\355"));
+
+  EXPECT_EQ(-2, columnWidth("qwer\344"));
+  EXPECT_EQ(-2, columnWidth("qwer\344\270"));
+  EXPECT_EQ(-2, columnWidth("qwer\344\270\033"));
+  EXPECT_EQ(-2, columnWidth("qwer\344\270\300"));
+  EXPECT_EQ(-2, columnWidth("qwer\377\366\355"));
+
+  // UTF-8 sequences longer than 4 bytes correspond to unallocated Unicode
+  // characters.
+  EXPECT_EQ(-2, columnWidth("\370\200\200\200\200"));     // U+200000
+  EXPECT_EQ(-2, columnWidth("\374\200\200\200\200\200")); // U+4000000
+#endif // __APPLE__
+}
+
+TEST(Locale, isPrint) {
+  EXPECT_EQ(false, isPrint(0)); // <control-0000>-<control-001F>
+  EXPECT_EQ(false, isPrint(0x01));
+  EXPECT_EQ(false, isPrint(0x1F));
+  EXPECT_EQ(true, isPrint(' '));
+  EXPECT_EQ(true, isPrint('A'));
+  EXPECT_EQ(true, isPrint('~'));
+  EXPECT_EQ(false, isPrint(0x7F)); // <control-007F>..<control-009F>
+  EXPECT_EQ(false, isPrint(0x90));
+  EXPECT_EQ(false, isPrint(0x9F));
+
+  EXPECT_EQ(true, isPrint(0xAC));
+  // FIXME: Figure out if we want to treat SOFT HYPHEN as printable character.
+#ifndef __APPLE__
+  EXPECT_EQ(false, isPrint(0xAD)); // SOFT HYPHEN
+#endif // __APPLE__
+  EXPECT_EQ(true, isPrint(0xAE));
+
+  // MacOS implementation doesn't think it's printable.
+#ifndef __APPLE__
+  EXPECT_EQ(true, isPrint(0x0377)); // GREEK SMALL LETTER PAMPHYLIAN DIGAMMA
+#endif // __APPLE__
+  EXPECT_EQ(false, isPrint(0x0378)); // <reserved-0378>..<reserved-0379>
+
+  EXPECT_EQ(false, isPrint(0x0600)); // ARABIC NUMBER SIGN
+
+  EXPECT_EQ(false, isPrint(0x1FFFF)); // <reserved-1F774>..<noncharacter-1FFFF>
+  EXPECT_EQ(true, isPrint(0x20000)); // CJK UNIFIED IDEOGRAPH-20000
+
+  EXPECT_EQ(false, isPrint(0x10FFFF)); // noncharacter
+}
+
+#endif // _WIN32
+
+} // namespace
+} // namespace locale
+} // namespace sys
+} // namespace llvm