#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>

void update(int **pp, int value);

TEST_CASE("update sets value to 25", "[update]") {
    int x = 5;
    int *p = &x;
    int **pp = &p;
    update(pp, 25);
    REQUIRE(x == 25); // x should be set to 10
}

TEST_CASE("update works for negative initial value", "[update]") {
    int x = -99;
    int *p = &x;
    int **pp = &p;
    update(pp, 10);
    REQUIRE(x == 10); // x should be set to 10
}

TEST_CASE("update does not alter pointer address", "[update]") {
    int x = 2;
    int *p = &x;
    int **pp = &p;
    update(pp, 50);
    REQUIRE(p == &x); // pointer should still point to x
}

test.cpp

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Challenge: Multi-level Pointers

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