Criterion/samples/theories.cc

#ifdef _MSC_VER
#pragma warning(disable : 4090)
#endif

#include <criterion/theories.h>
#ifdef __cplusplus
# include <climits>
#else
# include <limits.h>
#endif

# define INT_DATAPOINTS DataPoints(int, 0, 1, 2, -1, -2, INT_MAX, INT_MIN)

// Let's test the multiplicative properties of 32-bit integers:

int bad_mul(int a, int b) {
    return a * b;
}

int bad_div(int a, int b) {
    return a / b;
}

TheoryDataPoints(algebra, bad_divide_is_inverse_of_multiply) = {
    INT_DATAPOINTS,
    INT_DATAPOINTS,
};

Theory((int a, int b), algebra, bad_divide_is_inverse_of_multiply) {
    cr_assume(b != 0);
    cr_assert_eq(a, bad_div(bad_mul(a, b), b));
}

// The above implementation of mul & div fails the test because of overflows,
// let's try again:

long long good_mul(long long a, long long b) {
    return a * b;
}

long long good_div(long long a, long long b) {
    return a / b;
}

TheoryDataPoints(algebra, good_divide_is_inverse_of_multiply) = {
    INT_DATAPOINTS,
    INT_DATAPOINTS,
};

Theory((int a, int b), algebra, good_divide_is_inverse_of_multiply) {
    cr_assume(b != 0);
    cr_assert_eq(a, good_div(good_mul(a, b), b));
}

// For triangulation

Test(algebra, multiplication_by_integer) {
    cr_assert_eq(10, good_mul(5, 2));
}

// Another property test

TheoryDataPoints(algebra, zero_is_absorbing) = {
    INT_DATAPOINTS,
    INT_DATAPOINTS,
};

Theory((int a, int b), algebra, zero_is_absorbing) {
    cr_assume(a == 0 || b == 0);
    cr_assert_eq(0, good_mul(a, b));
}

// Testing for various parameters

struct my_object {
    int foo;
};

struct my_object o = {42};

char test_str[] = {'t', 'e', 's', 't', '\0'};

TheoryDataPoints(theory, misc) = {
    DataPoints(char, 'a'),
    DataPoints(bool, true),
    DataPoints(short, 1),
    DataPoints(int, 1),
    DataPoints(long, 1),
    DataPoints(long long, 1),
    DataPoints(float, 3.14f),
    DataPoints(double, 3.14),
    DataPoints(char *, test_str),
    DataPoints(const char *, "other test"),
    DataPoints(struct my_object *, &o),
};

Theory((char c, bool b, short s, int i, long l, long long ll, float f, double d, char *str, const char *cstr, struct my_object *obj), theory, misc) {
    float reff = 3.14f;
    double refd = 3.14;

    cr_assert(b);
    cr_assert_eq(c, 'a');
    cr_assert_eq(s, 1);
    cr_assert_eq(i, 1);
    cr_assert_eq(l, 1);
    cr_assert_eq(ll, 1);
    cr_assert_eq(f, reff);
    cr_assert_eq(d, refd);
    cr_assert_str_eq(str, "test");
    cr_assert_str_eq(cstr, "other test");
    cr_assert_eq(obj->foo, 42);

    // abort to see the formatted string of all parameters
    cr_assert_fail();
}

// Manually generate datapoints

TheoryDataPoints(theory, gen) = {
    DataPoints(int, 0), // placeholder
};

static void generate_datapoints(void) {
    static int arr[] = {1, 2, 3, 4, 5};
    TheoryDataPoint(theory, gen)[0].len = 5;
    TheoryDataPoint(theory, gen)[0].arr = &arr;
}

Theory((int i), theory, gen, .init = generate_datapoints) {
    (void) i;
    cr_assert_fail(); // we fail to display the parameter
}