src/tests/test_window.cc


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