move asserts to tests

src/population.rs

@@ -38,12 +38,6 @@ impl Population {
                 the_humans[idx].y = y;
             }
         }
-        for h in the_humans.iter() {
-            let idx = human_idx(h.x, h.y, width);
-            assert_eq!(the_humans[idx].x, h.x);
-            assert_eq!(the_humans[idx].y, h.y);
-        }
-        assert_eq!(the_humans.len(), (width * height) as usize);
         Self {
             start_infected_ratio: start_infected_ratio,
             start_immune_ratio: start_immune_ratio,
@@ -373,6 +367,7 @@ mod tests {
     #[test]
     fn population_new() {
         let disease = Disease::new(20, 10, 5, String::from("Covid 44"));
+        let (width, height) = (5, 7);
         let population = Population::new(20, 10, 5, 5, 7, disease);
         assert_eq!(population.humans.len(), 5 * 7);
         for human in population.humans.iter() {
@@ -381,6 +376,13 @@ mod tests {
                 "all humans should be normal"
             );
         }
+        for h in population.humans.iter() {
+            let idx = human_idx(h.x, h.y, width);
+            assert_eq!(population.humans[idx].x, h.x, "coordinates should match");
+            assert_eq!(population.humans[idx].y, h.y, "coordinates should match");
+        }
+        assert_eq!(population.humans.len(), (width * height) as usize);
+
     }
 
     #[test]