teropa
diff --git a/‎src/core.js‎
Lines changed: 9 additions & 5 deletions b/‎src/core.js‎
Lines changed: 9 additions & 5 deletions
diff --git a/‎test/core_spec.js‎
Lines changed: 12 additions & 0 deletions b/‎test/core_spec.js‎
Lines changed: 12 additions & 0 deletions
@@ -32,9 +32,13 @@ export function next(state) {
 }
 
 export function vote(voteState, entry) {
-  return voteState.updateIn(
-    ['tally', entry],
-    0,
-    tally => tally + 1
-  );
+  if (voteState.get('pair').includes(entry)) {
+    return voteState.updateIn(
+      ['tally', entry],
+      0,
+      tally => tally + 1
+    );
+  } else {
+    return voteState;
+  }
 }
@@ -144,6 +144,18 @@ describe('application logic', () => {
       );
     });
 
+    it('ignores the vote if for an invalid entry', () => {
+      expect(
+        vote(Map({
+          pair: List.of('Trainspotting', '28 Days Later')
+        }), 'Sunshine')
+      ).to.equal(
+        Map({
+          pair: List.of('Trainspotting', '28 Days Later')
+        })
+      );
+    });
+
   });
 
 });