Function TEST

test/string_util_unittest.cc:66–223

}  // namespace

TEST(StringUtilTest, TruncateUTF8ToByteSize) {
  std::string output;

  // Empty strings and invalid byte_size arguments
  EXPECT_FALSE(Truncated(std::string(), 0, &output));
  EXPECT_EQ(output, "");
  EXPECT_TRUE(Truncated("\xe1\x80\xbf", 0, &output));
  EXPECT_EQ(output, "");
  EXPECT_FALSE(Truncated("\xe1\x80\xbf", (size_t)-1, &output));
  EXPECT_FALSE(Truncated("\xe1\x80\xbf", 4, &output));

  // Testing the truncation of valid UTF8 correctly
  EXPECT_TRUE(Truncated("abc", 2, &output));
  EXPECT_EQ(output, "ab");
  EXPECT_TRUE(Truncated("\xc2\x81\xc2\x81", 2, &output));
  EXPECT_EQ(output.compare("\xc2\x81"), 0);
  EXPECT_TRUE(Truncated("\xc2\x81\xc2\x81", 3, &output));
  EXPECT_EQ(output.compare("\xc2\x81"), 0);
  EXPECT_FALSE(Truncated("\xc2\x81\xc2\x81", 4, &output));
  EXPECT_EQ(output.compare("\xc2\x81\xc2\x81"), 0);

  {
    const char array[] = "\x00\x00\xc2\x81\xc2\x81";
    const std::string array_string(array, arraysize(array));
    EXPECT_TRUE(Truncated(array_string, 4, &output));
    EXPECT_EQ(output.compare(std::string("\x00\x00\xc2\x81", 4)), 0);
  }

  {
    const char array[] = "\x00\xc2\x81\xc2\x81";
    const std::string array_string(array, arraysize(array));
    EXPECT_TRUE(Truncated(array_string, 4, &output));
    EXPECT_EQ(output.compare(std::string("\x00\xc2\x81", 3)), 0);
  }

  // Testing invalid UTF8
  EXPECT_TRUE(Truncated("\xed\xa0\x80\xed\xbf\xbf", 6, &output));
  EXPECT_EQ(output.compare(""), 0);
  EXPECT_TRUE(Truncated("\xed\xa0\x8f", 3, &output));
  EXPECT_EQ(output.compare(""), 0);
  EXPECT_TRUE(Truncated("\xed\xbf\xbf", 3, &output));
  EXPECT_EQ(output.compare(""), 0);

  // Testing invalid UTF8 mixed with valid UTF8
  EXPECT_FALSE(Truncated("\xe1\x80\xbf", 3, &output));
  EXPECT_EQ(output.compare("\xe1\x80\xbf"), 0);
  EXPECT_FALSE(Truncated("\xf1\x80\xa0\xbf", 4, &output));
  EXPECT_EQ(output.compare("\xf1\x80\xa0\xbf"), 0);
  EXPECT_FALSE(Truncated("a\xc2\x81\xe1\x80\xbf\xf1\x80\xa0\xbf",
              10, &output));
  EXPECT_EQ(output.compare("a\xc2\x81\xe1\x80\xbf\xf1\x80\xa0\xbf"), 0);
  EXPECT_TRUE(Truncated("a\xc2\x81\xe1\x80\xbf\xf1""a""\x80\xa0",
              10, &output));
  EXPECT_EQ(output.compare("a\xc2\x81\xe1\x80\xbf\xf1""a"), 0);
  EXPECT_FALSE(Truncated("\xef\xbb\xbf" "abc", 6, &output));
  EXPECT_EQ(output.compare("\xef\xbb\xbf" "abc"), 0);

  // Overlong sequences