Fix directionality of edge test in common

tests/edu/caltech/cs2/project07/MarvelTests.java

@@ -101,7 +101,12 @@ public class MarvelTests {
                 MARVEL_GRAPH.removeEdge(c2, c1);
                 assertEquals(null, MARVEL_GRAPH.adjacent(c2, c1), "An edge is non-null after removal");
                 if (edge > 80) {
-                    common.add(c1 + " --" + edge + "-- " + c2);
+                    if (c1.compareTo(c2) < 0) {
+                        common.add(c1.strip() + " --" + edge + "-- " + c2.strip());
+                    }
+                    else {
+                        common.add(c2.strip() + " --" + edge + "-- " + c1.strip());
+                    }
                 }
             }
             assertTrue(MARVEL_GRAPH.neighbors(c1).isEmpty(), "After removing all of a vertex's neighbors, neighbors() is non-empty");
@@ -122,7 +127,21 @@ public class MarvelTests {
         }
 
         while (fr.hasNextLine()) {
-            expected.add(fr.nextLine());
+            String l = fr.nextLine();
+            // is edge - sort to remove dependence on directionality for correctness
+            if (l.contains("--")) {
+                String[] spl = l.split("--");
+                String v1 = spl[0].strip();
+                String v2 = spl[2].strip();
+                String e = spl[1];
+                if (v1.compareTo(v2) < 0) {
+                    l = v1 + " --" + e + "-- " + v2;
+                }
+                else {
+                    l = v2 + " --" + e + "-- " + v1;
+                }
+            }
+            expected.add(l);
         }
 
         MatcherAssert.assertThat(actual,