diff --git a/src/main.rs b/src/main.rs
index 5ba7885..e839bf5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -66,15 +66,17 @@ impl Graph {
 
     fn add_incidence(&mut self, v1: Vertex, v2: Vertex) {
         self.incidence_vertices.push(v2);
-        self.next_incidences.push(self.incidence_headers[v1.0].first_incidence.take());
+        self.next_incidences
+            .push(self.incidence_headers[v1.0].first_incidence.take());
         self.incidence_headers[v1.0].incidence_count += 1;
-        self.incidence_headers[v1.0].first_incidence = Some(Incidence(self.incidence_vertices.len() - 1));
+        self.incidence_headers[v1.0].first_incidence =
+            Some(Incidence(self.incidence_vertices.len() - 1));
     }
 }
 
 fn main() {
     // TODO: Move this graph example into one or more tests.
-    let mut graph = Graph{
+    let mut graph = Graph {
         // TODO: The initializations should happen in an initializer or constructor
         incidence_headers: vec![],
         next_incidences: vec![],
@@ -100,16 +102,35 @@ fn main() {
     assert_eq!(graph.edge_count(), 14, "edge count");
     let expected_degrees = [1, 4, 4, 2, 4, 2, 3, 3, 2, 3];
     for i in 0..graph.vertex_count() {
-        assert_eq!(graph.degree(vertices[i]), expected_degrees[i],
-                   "degree of {:?}", vertices[i]);
+        assert_eq!(
+            graph.degree(vertices[i]),
+            expected_degrees[i],
+            "degree of {:?}",
+            vertices[i]
+        );
     }
 
-    assert_eq!(graph.are_adjacent(vertices[0], vertices[1]), true,
-               "adjacency of {:?} and {:?}", vertices[0], vertices[1]);
-    assert_eq!(graph.are_adjacent(vertices[9], vertices[5]), true,
-               "adjacency of {:?} and {:?}", vertices[0], vertices[5]);
-    assert_eq!(graph.are_adjacent(vertices[9], vertices[3]), false,
-               "adjacency of {:?} and {:?}", vertices[9], vertices[3]);
+    assert_eq!(
+        graph.are_adjacent(vertices[0], vertices[1]),
+        true,
+        "adjacency of {:?} and {:?}",
+        vertices[0],
+        vertices[1]
+    );
+    assert_eq!(
+        graph.are_adjacent(vertices[9], vertices[5]),
+        true,
+        "adjacency of {:?} and {:?}",
+        vertices[0],
+        vertices[5]
+    );
+    assert_eq!(
+        graph.are_adjacent(vertices[9], vertices[3]),
+        false,
+        "adjacency of {:?} and {:?}",
+        vertices[9],
+        vertices[3]
+    );
 
     for i in 0..vertices.len() {
         let exp = match i {
@@ -117,10 +138,20 @@ fn main() {
             1 | 4 | 5 | 6 => true,
             _ => false,
         };
-        assert_eq!(graph.are_adjacent(vertices[2], vertices[i]), exp,
-                   "adjacency of {:?} and {:?}", vertices[2], vertices[i]);
-        assert_eq!(graph.are_adjacent(vertices[i], vertices[2]), exp,
-                   "adjacency of {:?} and {:?}", vertices[i], vertices[2]);
+        assert_eq!(
+            graph.are_adjacent(vertices[2], vertices[i]),
+            exp,
+            "adjacency of {:?} and {:?}",
+            vertices[2],
+            vertices[i]
+        );
+        assert_eq!(
+            graph.are_adjacent(vertices[i], vertices[2]),
+            exp,
+            "adjacency of {:?} and {:?}",
+            vertices[i],
+            vertices[2]
+        );
     }
 
     // TODO: test Dijkstra's algorithm starting at 0 and at another vertex.