EXPECT_EQ("abc\\r", backslashify(string("abc\r")));
EXPECT_EQ("abc\\x0d", backslashify(string("abc\r"), true));
EXPECT_EQ("\\0\\0", backslashify(string(2, '\0')));
EXPECT_EQ("abc\\r", backslashify(string("abc\r")));
EXPECT_EQ("abc\\x0d", backslashify(string("abc\r"), true));
EXPECT_EQ("\\0\\0", backslashify(string(2, '\0')));