escape_newline_test.cc

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#include "catch.hpp"
#include "escape_newline.hh"
 
TEST_CASE("escape_newline")
{
        SECTION("round trip") {
                auto test = [](std::string_view s) {
                        auto e = escape_newline::encode(s);
                        auto d = escape_newline::decode(e);
                        CHECK(e.size() >= d.size());
                        CHECK(d == s);
                };
                test("");
                test("bla");
                test("bla\nbla");
                test("bla\\bla");
                test("\n\n\\\\");
        }
        SECTION("errors") {
                // * All inputs are valid for encode().
                // * But some inputs should normally never be passed to decode()
                //   (as in: they can never have been the result of a prior
                //   encode()).
                //   Nevertheless we try to recover from such inputs.
 
                // Single backslash at the end -> gets dropped.
                CHECK(escape_newline::decode("bla\\") == "bla");
 
                // Normally only "\\" or "\n" should occur, all other "<x>" are
                // in principle invalid, but we decode them as 'x'
                CHECK(escape_newline::decode("bl\\a") == "bla");
        }
}