Test framework

Learn to write your own test framework.

Test framework

A test framework is a small skeleton that runs tests and collects results. At its simplest it has a counter and a condition check.

The function void test_run(int cond) increments the passed counter when the condition is true. At the end you print how many passed with printf("geçti: %d\n", passed);. This is the core of real frameworks (Unity, CMocka); the function signature and counter structure start here.

Incrementing the counter

You declare a global counter int passed = 0;. Inside test_run you do passed++ when the condition is true. Globals are practical for small programs; larger projects move them into a struct.

The function signature: void test_run(int cond) { if (cond) passed++; }. With this minimal framework you can test any number of conditions. At the end you print a summary with printf. Counter accuracy is the foundation of a reliable framework.

Exercise Simple test framework

Declare a global int passed = 0;. Write void test_run(int cond): if (cond) passed++;. In main call test_run(2 + 3 == 5); and print printf("geçti: %d\n", passed);.

Show example solution

#include <stdio.h>

int passed = 0;

void test_run(int cond) {
    if (cond) passed++;
}

int main(void) {
    test_run(2 + 3 == 5);
    printf("geçti: %d\n", passed);
    return 0;
}

Test yourself

Match framework parts

test_run

Tests condition
passed

Success counter
cond

Condition parameter
printf

Prints result
What does test_run do?
- Allocates memory
- Opens a file
- Sends a signal
- Runs a test
Show answer

Runs a test — test_run checks the condition and updates the counter.

test_run signature

void test_run(____) { if (cond) passed++; }

Show answer

void test_run(int cond) { if (cond) passed++; }

Next lesson: Test doubles

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