Unit tests, Platformio, googletest, errors, linking

[maxgerhardt]

@rytir.ch

I followed the tutorial: ESP8266 Unit Testing - Part 2/2: GoogleTest and GoogleMock - Day 33 of #100DaysOfCode​ in IoT - YouTube

Outdated since PIO core 6.0 came out. Unit testing was massively refactored. Please have a look at the new documentation and simliar topics (CI unit test gtest fail: undefined reference to `pthread_setspecific' - #2 by ivankravets, Pio test broke with esp32doit-devkit-v1 in pio core 6.1, File structure to satisfy both building and testing?).

Your particular

@rytir.ch

undefined reference to LedDiode::LedDiode()' .pio\build\native\test\test_desktop\LedDiodeTest.o:LedDiodeTest.cpp:(.text+0x14a): undefined reference to LedDiode::blick()’
My code:

error is because the implementation for the component you want to test is in src/ with the src/LedDiode.cpp and src/LedDiode.hpp file. Any sources in src/ are by default not compiled when testing (test_build_src = no by default). So, you should put those two files in lib/LedDiode so that unit tests can find them.