Testing, Property Based Testing, Elixir, Streamdata, Generative Testing.
believe. In order not to be a fool, I added a test for 87 and it should fail…because I am a smart guy. Oh No! Am I a fool? I repeated it over 10 times and it always passed. How cruel this world is... After I changed the integer range to 0~100, I finally got the test failure in 80% (8 in 10 times).