Add some more docs to the distinct test.

test/test-disinct.js

@@ -4,10 +4,19 @@ var insert = require('./insert');
 insert('distinct', [{
   goodbye:'world',
   hello:'space'
+}, {
+  goodbye:'world',
+  hello:'space'
+}, {
+  goodbye:'earth',
+  hello:'space'
+}, {
+  goodbye:'world',
+  hello:'space'
 }], function(db, t, done) {
   db.a.distinct('goodbye',{hello:'space'},function(err, docs) {
     t.ok(!err);
-    t.equal(docs.length, 1);
+    t.equal(docs.length, 2);
     t.equal(docs[0], 'world');
     done();
   });