deck_in_a_dash/engine/tests/smoke_test.c

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

#include "../src/reading.h"
#include "../src/i18n.h"

static void test_tarot_determinism(void) {
  CelticCrossSpread a, b, c;
  tarot_draw_celtic_cross("2026-07-03", &a);
  tarot_draw_celtic_cross("2026-07-03", &b);
  tarot_draw_celtic_cross("2026-07-04", &c);

  for (int i = 0; i < TAROT_SPREAD_SIZE; i++) {
    assert(a.positions[i].card == b.positions[i].card);
    assert(a.positions[i].reversed == b.positions[i].reversed);
  }

  int differs = 0;
  for (int i = 0; i < TAROT_SPREAD_SIZE; i++) {
    if (a.positions[i].card != c.positions[i].card ||
        a.positions[i].reversed != c.positions[i].reversed) {
      differs = 1;
      break;
    }
  }
  assert(differs && "different seeds should (almost always) differ");

  /* No repeated cards within a single spread. */
  for (int i = 0; i < TAROT_SPREAD_SIZE; i++) {
    for (int j = i + 1; j < TAROT_SPREAD_SIZE; j++) {
      assert(a.positions[i].card != a.positions[j].card);
    }
  }

  printf("PASS test_tarot_determinism\n");
}

static void test_natal_sun_sign(void) {
  /* 2000-06-15 noon UTC: the Sun is well inside Gemini (60-90 degrees),
   * away from any sign boundary, so this is a stable regression check
   * against the ephemeris math. Birth location doesn't affect the Sun's
   * geocentric ecliptic longitude, only the Ascendant. */
  BirthData birth = {
    .year = 2000, .month = 6, .day = 15,
    .hour = 12, .minute = 0,
    .utc_offset_hours = 0.0,
    .latitude = 52.5, .longitude = 13.4,
  };

  NatalChart chart;
  astro_compute_natal_chart(&birth, &chart);

  assert(chart.bodies[PLANET_SUN].sign == SIGN_GEMINI);

  /* Whole-sign house invariant: body.house (1-12) must name the house
   * whose sign (chart.houses[house-1]) is that same body's sign. */
  for (int b = 0; b < NUM_BODIES; b++) {
    assert(chart.bodies[b].house >= 1 && chart.bodies[b].house <= 12);
    assert(chart.houses[chart.bodies[b].house - 1] == chart.bodies[b].sign);
  }

  printf("PASS test_natal_sun_sign\n");
}

static void test_reading_generate_smoke(void) {
  BirthData birth = {
    .year = 1990, .month = 5, .day = 14,
    .hour = 14, .minute = 32,
    .utc_offset_hours = 2.0,
    .latitude = 52.52, .longitude = 13.405,
  };

  DailyReading r1, r2;
  reading_generate("smoke-test-seed", &birth, 1751500000, &r1);
  reading_generate("smoke-test-seed", &birth, 1751500000, &r2);

  for (int i = 0; i < TAROT_SPREAD_SIZE; i++) {
    assert(r1.spread.positions[i].card == r2.spread.positions[i].card);
    assert(r1.spread.positions[i].reversed == r2.spread.positions[i].reversed);
  }
  for (int b = 0; b < NUM_BODIES; b++) {
    assert(r1.natal.bodies[b].ecliptic_longitude == r2.natal.bodies[b].ecliptic_longitude);
    assert(r1.transits.bodies[b].ecliptic_longitude == r2.transits.bodies[b].ecliptic_longitude);

    /* Transiting planets' houses are read against the natal chart's
     * houses, not a fresh chart for "now" - same invariant as the natal
     * bodies, but checked against r1.natal.houses. */
    assert(r1.transits.bodies[b].house >= 1 && r1.transits.bodies[b].house <= 12);
    assert(r1.natal.houses[r1.transits.bodies[b].house - 1] == r1.transits.bodies[b].sign);
  }
  assert(r1.transits.aspect_count == r2.transits.aspect_count);

  printf("PASS test_reading_generate_smoke\n");
}

static void test_reading_print_json_shape(void) {
  BirthData birth = {
    .year = 1990, .month = 5, .day = 14,
    .hour = 14, .minute = 32,
    .utc_offset_hours = 2.0,
    .latitude = 52.52, .longitude = 13.405,
  };

  DailyReading r;
  reading_generate("smoke-test-seed", &birth, 1751500000, &r);

  FILE *tmp = tmpfile();
  assert(tmp);
  reading_print_json(&r, tmp);

  rewind(tmp);
  char buf[16384];
  size_t n = fread(buf, 1, sizeof buf - 1, tmp);
  buf[n] = '\0';
  fclose(tmp);

  /* Loose structural checks - not a full JSON validator, just enough to
   * catch a broken serializer (unbalanced braces, a missing section, or
   * a stray astro_*_name()/tarot_*_name() call leaking translated text
   * into what must stay language-independent regardless of --lang). */
  assert(buf[0] == '{');
  assert(strstr(buf, "\"natal\"") != NULL);
  assert(strstr(buf, "\"transits\"") != NULL);
  assert(strstr(buf, "\"spread\"") != NULL);
  assert(strstr(buf, "\"aspects\"") != NULL);
  assert(strstr(buf, "\"body\": \"sun\"") != NULL); /* slug, not the display name */
  assert(strstr(buf, "\"Sun\"") == NULL);            /* never a *_name() value */

  int braces = 0;
  for (size_t i = 0; i < n; i++) {
    if (buf[i] == '{') braces++;
    if (buf[i] == '}') braces--;
  }
  assert(braces == 0);

  printf("PASS test_reading_print_json_shape\n");
}

/* Run with cwd == repo root (as `make test` does), so the shipped
 * engine/i18n/ .lang files are reachable at that path. */
static void test_i18n_fallback_and_translation(void) {
  /* No catalog loaded yet: every lookup returns the caller's fallback. */
  assert(strcmp(i18n_get("does.not.exist", "fallback text"), "fallback text") == 0);

  bool loaded = i18n_load("engine/i18n/de.lang");
  assert(loaded && "expected engine/i18n/de.lang to exist and load");
  assert(strcmp(i18n_get("body.sun", "Sun"), "Sonne") == 0);
  assert(strcmp(i18n_get("does.not.exist", "fallback text"), "fallback text") == 0);

  /* astro_ and tarot_ accessors route through the same loaded catalog. */
  assert(strcmp(astro_body_name(PLANET_MOON), "Mond") == 0);
  assert(strcmp(astro_sign_name(SIGN_LEO), "Löwe") == 0);
  assert(strcmp(astro_moon_phase_name(MOON_FULL), "Vollmond") == 0);
  assert(strcmp(astro_aspect_name(ASPECT_TRINE), "Trigon") == 0);
  assert(strcmp(tarot_card_name(CARD_WORLD), "Die Welt") == 0);
  assert(strcmp(tarot_position_name(POSITION_OUTCOME), "Das Ergebnis") == 0);

  /* Loading a file that doesn't exist fails and leaves the previously
   * loaded catalog in place, rather than silently clearing it. */
  assert(!i18n_load("engine/i18n/does-not-exist.lang"));
  assert(strcmp(i18n_get("body.sun", "Sun"), "Sonne") == 0);

  /* Loading a different language replaces the catalog wholesale. */
  loaded = i18n_load("engine/i18n/en.lang");
  assert(loaded);
  assert(strcmp(astro_body_name(PLANET_MOON), "Moon") == 0);

  printf("PASS test_i18n_fallback_and_translation\n");
}

int main(void) {
  test_tarot_determinism();
  test_natal_sun_sign();
  test_reading_generate_smoke();
  test_reading_print_json_shape();
  test_i18n_fallback_and_translation();
  printf("All smoke tests passed.\n");
  return 0;
}