diff --git a/Util/model_parser/test/main.cpp b/Util/model_parser/test/main.cpp
index 2f442f18a0..92d3d98ec6 100644
--- a/Util/model_parser/test/main.cpp
+++ b/Util/model_parser/test/main.cpp
@@ -23,6 +23,9 @@ int main(int argc, char *argv[]) {
     std::string model = "sub_chandra.M_WD-1.10.M_He-0.050.hse.CO.N14.N.10.00km";
     read_model_file(model);
 
+    // test locate and ensure that the index we get is such that
+    // profile.r(idx) < r < profile.r(idx+1)
+
     Real r{3.89e7};
 
     std::cout << "testing locate" << std::endl;
@@ -34,8 +37,20 @@ int main(int argc, char *argv[]) {
     std::cout << "testing interpolate" << std::endl;
 
     // density is monotonically decreasing
+    // test to make sure that we see that
+
     auto dens = interpolate(r, model::idens);
     AMREX_ALWAYS_ASSERT(dens <= model::profile(0).state(idx, model::idens) &&
                         dens >= model::profile(0).state(idx+1, model::idens));
 
+    // test the bounds.  Our model spans r = [5.e5, 4.0955e9]
+
+    std::cout << "testing boundaries of the model" << std::endl;
+
+    auto idx_lo_bnd = locate(-1.0, 0);
+    AMREX_ALWAYS_ASSERT(idx_lo_bnd == 0);
+
+    auto idx_hi_bnd = locate(4.1e9, 0);
+    AMREX_ALWAYS_ASSERT(idx_hi_bnd == model::npts-2);
+
 }