src/tests/test_window.cpp


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#include "audio/window.h"
#include <stdio.h>
#include <math.h>
#include <assert.h>

// A simple floating point comparison with a tolerance
bool is_close(float a, float b, float epsilon = 1e-6f) {
    return fabsf(a - b) < epsilon;
}

int main() {
    float window[WINDOW_SIZE];
    hamming_window_512(window);

    // Test 1: Window should start and end at the same small value
    assert(is_close(window[0], 0.08f));
    assert(is_close(window[WINDOW_SIZE - 1], 0.08f));
    printf("Test 1 passed: Window start and end values are correct.\n");

    // Test 2: Window should be symmetric
    for (int i = 0; i < WINDOW_SIZE / 2; ++i) {
        assert(is_close(window[i], window[WINDOW_SIZE - 1 - i]));
    }
    printf("Test 2 passed: Window is symmetric.\n");

    // Test 3: The two middle points of the even-sized window should be equal and the peak.
    assert(is_close(window[WINDOW_SIZE / 2 - 1], window[WINDOW_SIZE / 2]));
    assert(window[WINDOW_SIZE / 2] > window[WINDOW_SIZE / 2 - 2]); // Should be greater than neighbors
    printf("Test 3 passed: Window peak is correct for even size.\n");
    
    printf("All tests passed for Hamming window!\n");

    return 0;
}