Recalibrate default test catalog exposure

tests/test_frame.c

@@ -9,6 +9,7 @@
 
 int main(void) {
   const int width = 100, height = 100;
+  const double test_exposure = 1e-3;
   const PointSpreadFunction psf = {.fwhm_pixels = 2.7, .moffat_beta = 4.5};
   const GeodesicTraceConfig trace = {.coordinate_time_step = 0.25,
                                      .max_steps = 100};
@@ -25,7 +26,8 @@ int main(void) {
       frame_lens_mesh_trace(&mesh, &spacetime, &observer, &trace))
     goto done;
   const size_t images =
-      frame_splat_catalog(&mesh, &catalog, hdr, width, height, 100.0, &psf);
+      frame_splat_catalog(&mesh, &catalog, hdr, width, height, test_exposure,
+                          &psf);
   if (images != 1 || hdr[3 * (50 * width + 50)] <= 0.0) {
     fputs("flat-space inverse lens-map regression failed\n", stderr);
     goto done;
@@ -42,10 +44,10 @@ int main(void) {
   omp_set_dynamic(0);
   omp_set_num_threads(1);
   const size_t serial_images = frame_splat_catalog(
-      &mesh, &catalog, serial_hdr, width, height, 100.0, &psf);
+      &mesh, &catalog, serial_hdr, width, height, test_exposure, &psf);
   omp_set_num_threads(4);
   const size_t parallel_images = frame_splat_catalog(
-      &mesh, &catalog, parallel_hdr, width, height, 100.0, &psf);
+      &mesh, &catalog, parallel_hdr, width, height, test_exposure, &psf);
   omp_set_num_threads(original_threads);
   for (int value = 0; value < width * height * 3; ++value)
     if (fabs(serial_hdr[value] - parallel_hdr[value]) >
@@ -100,7 +102,7 @@ int main(void) {
   if (frame_lens_mesh_build_coarse(&fine_mesh, width, height, 1, 0.1) ||
       frame_lens_mesh_trace(&fine_mesh, &spacetime, &observer, &trace) ||
       frame_splat_catalog(&fine_mesh, &fine_catalog, hdr, width, height,
-                          100.0, &psf) != 1) {
+                          test_exposure, &psf) != 1) {
     fputs("fine source-triangle containment regression failed\n", stderr);
     frame_lens_mesh_destroy(&fine_mesh);
     goto done;