How to inspect correctness or incorrectness of the pseudo random numbers generator? [duplicate]

Let's say I have following C++ code for generation of the pseudo random numbers uniformly distributed in range <0;1> on 32 bits machine.

#include <cstdint>

float randomNumber() {
    static uint32_t next = 1;
    
    next = ((1103515245*next + 12345) % 4294967296);
    return static_cast<float>(next)/4294967296;
}

How can I convincingly inspect whether the code works correctly or not?