Clean up tests

tests/kickscore-basics.rs

@@ -8,13 +8,11 @@ fn kickscore_basic() {
     let mut model = ks::model::Binary::new(ks::model::binary::Observation::Probit);
 
     let k_spike = ks::kernel::Constant::new(0.5);
-
     let k_tom = ks::kernel::Exponential::new(1.0, 1.0);
-
-    let k_jerry: [Box<dyn ks::Kernel>; 2] = [
-        Box::new(ks::kernel::Constant::new(1.0)),
-        Box::new(ks::kernel::Matern52::new(0.5, 1.0)),
-    ];
+    let k_jerry = (
+        ks::kernel::Constant::new(1.0),
+        ks::kernel::Matern52::new(0.5, 1.0),
+    );
 
     model.add_item("Spike", k_spike);
     model.add_item("Tom", k_tom);