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diff --git a/unittests/Support/UnicodeTest.cpp b/unittests/Support/UnicodeTest.cpp
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+++ b/unittests/Support/UnicodeTest.cpp
@@ -0,0 +1,93 @@
+//===- unittests/Support/UnicodeTest.cpp - Unicode.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/Unicode.h"
+#include "gtest/gtest.h"
+
+namespace llvm {
+namespace sys {
+namespace unicode {
+namespace {
+
+TEST(Unicode, columnWidthUTF8) {
+  EXPECT_EQ(0, columnWidthUTF8(""));
+  EXPECT_EQ(1, columnWidthUTF8(" "));
+  EXPECT_EQ(1, columnWidthUTF8("a"));
+  EXPECT_EQ(1, columnWidthUTF8("~"));
+
+  EXPECT_EQ(6, columnWidthUTF8("abcdef"));
+
+  EXPECT_EQ(-1, columnWidthUTF8("\x01"));
+  EXPECT_EQ(-1, columnWidthUTF8("aaaaaaaaaa\x01"));
+  EXPECT_EQ(-1, columnWidthUTF8("\342\200\213")); // 200B ZERO WIDTH SPACE
+
+  // 00AD SOFT HYPHEN is displayed on most terminals as a space or a dash. Some
+  // text editors display it only when a line is broken at it, some use it as a
+  // line-break hint, but don't display. We choose terminal-oriented
+  // interpretation.
+  EXPECT_EQ(1, columnWidthUTF8("\302\255"));
+
+  EXPECT_EQ(0, columnWidthUTF8("\314\200"));     // 0300 COMBINING GRAVE ACCENT
+  EXPECT_EQ(1, columnWidthUTF8("\340\270\201")); // 0E01 THAI CHARACTER KO KAI
+  EXPECT_EQ(2, columnWidthUTF8("\344\270\200")); // CJK UNIFIED IDEOGRAPH-4E00
+
+  EXPECT_EQ(4, columnWidthUTF8("\344\270\200\344\270\200"));
+  EXPECT_EQ(3, columnWidthUTF8("q\344\270\200"));
+  EXPECT_EQ(3, columnWidthUTF8("\314\200\340\270\201\344\270\200"));
+
+  // Invalid UTF-8 strings, columnWidthUTF8 should error out.
+  EXPECT_EQ(-2, columnWidthUTF8("\344"));
+  EXPECT_EQ(-2, columnWidthUTF8("\344\270"));
+  EXPECT_EQ(-2, columnWidthUTF8("\344\270\033"));
+  EXPECT_EQ(-2, columnWidthUTF8("\344\270\300"));
+  EXPECT_EQ(-2, columnWidthUTF8("\377\366\355"));
+
+  EXPECT_EQ(-2, columnWidthUTF8("qwer\344"));
+  EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270"));
+  EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\033"));
+  EXPECT_EQ(-2, columnWidthUTF8("qwer\344\270\300"));
+  EXPECT_EQ(-2, columnWidthUTF8("qwer\377\366\355"));
+
+  // UTF-8 sequences longer than 4 bytes correspond to unallocated Unicode
+  // characters.
+  EXPECT_EQ(-2, columnWidthUTF8("\370\200\200\200\200"));     // U+200000
+  EXPECT_EQ(-2, columnWidthUTF8("\374\200\200\200\200\200")); // U+4000000
+}
+
+TEST(Unicode, isPrintable) {
+  EXPECT_FALSE(isPrintable(0)); // <control-0000>-<control-001F>
+  EXPECT_FALSE(isPrintable(0x01));
+  EXPECT_FALSE(isPrintable(0x1F));
+  EXPECT_TRUE(isPrintable(' '));
+  EXPECT_TRUE(isPrintable('A'));
+  EXPECT_TRUE(isPrintable('~'));
+  EXPECT_FALSE(isPrintable(0x7F)); // <control-007F>..<control-009F>
+  EXPECT_FALSE(isPrintable(0x90));
+  EXPECT_FALSE(isPrintable(0x9F));
+
+  EXPECT_TRUE(isPrintable(0xAC));
+  EXPECT_TRUE(isPrintable(0xAD)); // SOFT HYPHEN is displayed on most terminals
+                                  // as either a space or a dash.
+  EXPECT_TRUE(isPrintable(0xAE));
+
+  EXPECT_TRUE(isPrintable(0x0377));  // GREEK SMALL LETTER PAMPHYLIAN DIGAMMA
+  EXPECT_FALSE(isPrintable(0x0378)); // <reserved-0378>..<reserved-0379>
+
+  EXPECT_FALSE(isPrintable(0x0600)); // ARABIC NUMBER SIGN
+
+  EXPECT_FALSE(isPrintable(0x1FFFF)); // <reserved-1F774>..<noncharacter-1FFFF>
+  EXPECT_TRUE(isPrintable(0x20000));  // CJK UNIFIED IDEOGRAPH-20000
+
+  EXPECT_FALSE(isPrintable(0x10FFFF)); // noncharacter
+}
+
+} // namespace
+} // namespace unicode
+} // namespace sys
+} // namespace llvm