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diff --git a/tesseract/unittest/unichar_test.cc b/tesseract/unittest/unichar_test.cc
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+++ b/tesseract/unittest/unichar_test.cc
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+// (C) Copyright 2017, Google Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "include_gunit.h"
+#include "gmock/gmock.h"                // for testing::ElementsAreArray
+#include <tesseract/unichar.h>
+
+namespace tesseract {
+
+TEST(UnicharTest, Conversion) {
+  // This test verifies that Unichar::UTF8ToUTF32 and Unichar::UTF32ToUTF8
+  // show the required conversion properties.
+  // Test for round-trip utf8-32-8 for 1, 2, 3 and 4 byte codes.
+  const char* kUTF8Src = "a\u05d0\u0ca4\U0002a714";
+  const std::vector<char32> kUTF32Src = {'a', 0x5d0, 0xca4, 0x2a714};
+  // Check for round-trip conversion.
+  std::vector<char32> utf32 = UNICHAR::UTF8ToUTF32(kUTF8Src);
+  EXPECT_THAT(utf32, testing::ElementsAreArray(kUTF32Src));
+  std::string utf8 = UNICHAR::UTF32ToUTF8(utf32);
+  EXPECT_STREQ(kUTF8Src, utf8.c_str());
+}
+
+TEST(UnicharTest, InvalidText) {
+  // This test verifies that Unichar correctly deals with invalid text.
+  const char* kInvalidUTF8 = "a b\200d string";
+  const std::vector<char32> kInvalidUTF32 = {'a', ' ', 0x200000, 'x'};
+  // Invalid utf8 produces an empty vector.
+  std::vector<char32> utf32 = UNICHAR::UTF8ToUTF32(kInvalidUTF8);
+  EXPECT_TRUE(utf32.empty());
+  // Invalid utf32 produces an empty string.
+  std::string utf8 = UNICHAR::UTF32ToUTF8(kInvalidUTF32);
+  EXPECT_TRUE(utf8.empty());
+}
+
+}  // namespace