Summary - Testing basics

Combine assert and a test framework to write a calculator test.

Summary - Testing basics

In this group you learned assert, a simple test framework, test doubles, coverage and the setup/teardown pattern. Now you'll combine them into a calculator test.

The program defines a calc_add function; test_calculator checks it with assert. Main calls the test and prints a success message. All output is deterministic: when the math is right the program prints "hesap: tamam".

Exercise Calculator test

Write int calc_add(int a, int b) that returns a + b. Write void test_calculator(void) with assert(calc_add(2, 3) == 5); and assert(calc_add(0, 0) == 0);. In main call test_calculator(); and print printf("hesap: tamam\n");.

Show example solution

#include <stdio.h>
#include <assert.h>

int calc_add(int a, int b) {
    return a + b;
}

void test_calculator(void) {
    assert(calc_add(2, 3) == 5);
    assert(calc_add(0, 0) == 0);
}

int main(void) {
    test_calculator();
    printf("hesap: tamam\n");
    return 0;
}

Next steps

You learned the testing basics: assert, a simple framework, stubs, coverage and setup/teardown. These are the core of real test frameworks.

Next steps: full frameworks like Unity or CMocka, interaction testing with mock, HTML coverage reports with lcov, and parameterized tests to run one function with many inputs. The patterns you learned are the foundation of these tools.

Test yourself

When does assert fail?
- When the condition is true
- Always
- Never
- When the condition is false
Show answer

When the condition is false — assert aborts when the condition is false.
Match testing tools

assert

Checks condition
test_run

Framework core
stub_time

Deterministic value
coverage_counter

Branch counter

Next lesson: Profiling

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