From 00f96886c951352867b17c458c9f6ae2bd44f743 Mon Sep 17 00:00:00 2001
From: Dorival Pedroso <dorival.pedroso@gmail.com>
Date: Wed, 15 May 2024 22:04:14 +1000
Subject: [PATCH] Add test

---
 russell_ode/src/system.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/russell_ode/src/system.rs b/russell_ode/src/system.rs
index a8082b79..4df2161a 100644
--- a/russell_ode/src/system.rs
+++ b/russell_ode/src/system.rs
@@ -249,7 +249,7 @@ mod tests {
     use russell_sparse::{CooMatrix, Sym};
 
     #[test]
-    fn ode_system_most_none_works() {
+    fn ode_system_works() {
         struct Args {
             n_function_eval: usize,
             more_data_goes_here: bool,
@@ -281,7 +281,7 @@ mod tests {
     }
 
     #[test]
-    fn ode_system_some_none_works() {
+    fn ode_system_set_jacobian_works() {
         struct Args {
             n_function_eval: usize,
             n_jacobian_eval: usize,
@@ -348,5 +348,9 @@ mod tests {
             system.mass_put(0, 0, 1.0).err(),
             Some("mass matrix has not been initialized/enabled")
         );
+        assert_eq!(
+            system.init_mass_matrix(1).err(),
+            Some("the Jacobian function must be enabled first")
+        );
     }
 }