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-rw-r--r--ui/gfx/utf16_indexing_unittest.cc32
1 files changed, 32 insertions, 0 deletions
diff --git a/ui/gfx/utf16_indexing_unittest.cc b/ui/gfx/utf16_indexing_unittest.cc
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+++ b/ui/gfx/utf16_indexing_unittest.cc
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+// Copyright (c) 2012 The Chromium 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 "ui/gfx/utf16_indexing.h"
+
+namespace gfx {
+
+TEST(UTF16IndexingTest, IndexOffsetConversions) {
+ // Valid surrogate pair surrounded by unpaired surrogates
+ const char16 foo[] = {0xDC00, 0xD800, 0xD800, 0xDFFF, 0xDFFF, 0xDBFF, 0};
+ const string16 s(foo);
+ const size_t the_invalid_index = 3;
+ for (size_t i = 0; i <= s.length(); ++i)
+ EXPECT_EQ(i != the_invalid_index, IsValidCodePointIndex(s, i));
+ for (size_t i = 0; i <= s.length(); ++i) {
+ for (size_t j = i; j <= s.length(); ++j) {
+ ptrdiff_t offset = static_cast<ptrdiff_t>(j - i);
+ if (i <= the_invalid_index && j > the_invalid_index)
+ --offset;
+ EXPECT_EQ(offset, UTF16IndexToOffset(s, i, j));
+ EXPECT_EQ(-offset, UTF16IndexToOffset(s, j, i));
+ size_t adjusted_j = (j == the_invalid_index) ? j + 1 : j;
+ EXPECT_EQ(adjusted_j, UTF16OffsetToIndex(s, i, offset));
+ size_t adjusted_i = (i == the_invalid_index) ? i + 1 : i;
+ EXPECT_EQ(adjusted_i, UTF16OffsetToIndex(s, j, -offset));
+ }
+ }
+}
+
+} // namespace gfx