I'd like to find a way to make unit testing on my custom nginx modules but failed. Could anyone provide some suggestions? I once found the Test::Nginx framework, but it works as system test. Some people told me that I can use ngx_lua_module to expose C function in nginx module by the way of FFI. Could anyone know how to do that?
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Can you elaborate on "but it works as system test"? What do you mean by "system test"? – Danila Vershinin Jul 15 '21 at 09:03
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It will test the whole module's ability rather than specific function or C struct in the module. – Lei Liu Jul 15 '21 at 09:13
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You can compile that custom module as a library and then load the function with FFI with any available language that supports it e.g. Python with Ctypes or directly in C by linking against that new library and then using its symbols (such as functions) to assert against certain behavior / return values.
Peter Badida
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Thanks for your answer, while, the function or C struct in nginx module may need nginx environment, I don't know how to make sure its successful running without nginx. – Lei Liu Jul 14 '21 at 09:11
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@LeiLiu If you at least `#include` any nginx-related module or any other external module and use it, it'll for sure be required and will not work as a standalone code. Link against the libraries you use and then it'll work depending on the link type i.e. if dynamically it'll look for e.g. nginx's `.so` files and if statically, it'll work fine alone. – Peter Badida Jul 14 '21 at 09:17