tests/lapi: add string tests #124
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The patch add a CMake module that builds a luzer [1], a coverage-guided, native Lua fuzzing engine. Needed for the following commit. 1. https://github.com/ligurio/luzer
While extending tests it is often required to append additional path where Lua or Lua C auxiliary modules are located to LUA_PATH or LUA_CPATH environment variables. Due to insane semicolon interpolation in CMake strings (that converts such string to a list as a result), we need to escape semicolon in LUA_PATH/LUA_CPATH strings while building the resulting value. The patch introduce MakeLuaPath.cmake module to make LUA_PATH and LUA_CPATH definition convenient with <lapi_tests_make_lua_path> helper. This function takes all paths given as a variable list argument, joins them in a reverse order by a semicolon and yields the resulting string to a specified CMake variable. Needed for the following commit.
The patch adds initial infrastructure for Lua API tests and changes existed infrastructure for running these tests and adds a fuzzing tests for bitwise operations in PUC Rio (since 5.2) [1] Lua and bitwise functions in LuaJIT [2][3]. PUC Rio Lua provided auto-coercion of string arguments to numbers by default, but it has been removed from the core language in 5.4. LuaJIT provides auto-coercion of string arguments to numbers by default, but it doesn not tested by proposed tests. The patch requires commit "cmake: allow to set a Lua library outside" [4] in the `luzer` project. The proposed bitop tests are capable to reproduce a LuaJIT issue with bit op coercion for shifts in DUALNUM builds [5]. Rules from boolean algebra [6] has been used as invariants for bitwise expressions. 1. https://www.lua.org/manual/5.2/manual.html#6.7 2. https://bitop.luajit.org/semantics.html 3. https://bitop.luajit.org/api.html 4. ligurio/luzer@4ce52a6 5. LuaJIT/LuaJIT@69bbf3c1 6. https://en.wikipedia.org/wiki/Bitwise_operation#Boolean_algebra
The patch introduces an option that enables Lua API tests. The option is disabled by default because necessary dependencies are not installed in OSS Fuzz and thus workflow is failed.
The patch adds a fuzzing tests for Lua string functions and two helpers: `random_locale()`.
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Depends on
consume_integers()andconsume_numbers()luzer#44