text: var t = db.hashindex1;
  t.drop();
  
  // Include helpers for analyzing explain output.
  load("jstests/libs/analyze_plan.js");
  
  // test non-single field hashed indexes don't get created (maybe change later)
  var badspec = {a: "hashed", b: 1};
  t.ensureIndex(badspec);
  assert.eq(t.getIndexes().length, 1, "only _id index should be created");
  
  // test unique index not created (maybe change later)
  var goodspec = {a: "hashed"};
  t.ensureIndex(goodspec, {"unique": true});
  assert.eq(t.getIndexes().length, 1, "unique index got created.");
  
  // now test that non-unique index does get created
  t.ensureIndex(goodspec);
  assert.eq(t.getIndexes().length, 2, "hashed index didn't get created");
  
  // test basic inserts
  for (i = 0; i < 10; i++) {
      t.insert({a: i});
  }
  assert.eq(t.find().count(), 10, "basic insert didn't work");
  assert.eq(t.find().hint(goodspec).toArray().length, 10, "basic insert didn't work");
  assert.eq(t.find({a: 3}).hint({_id: 1}).toArray()[0]._id,
            t.find({a: 3}).hint(goodspec).toArray()[0]._id,
            "hashindex lookup didn't work");
  
  // make sure things with the same hash are not both returned
  t.insert({a: 3.1});
  assert.eq(t.find().count(), 11, "additional insert didn't work");
  assert.eq(t.find({a: 3.1}).hint(goodspec).toArray().length, 1);
  assert.eq(t.find({a: 3}).hint(goodspec).toArray().length, 1);
  // test right obj is found
  assert.eq(t.find({a: 3.1}).hint(goodspec).toArray()[0].a, 3.1);
  
  // Make sure we're using the hashed index.
  var explain = t.find({a: 1}).explain();
  assert(isIxscan(explain.queryPlanner.winningPlan), "not using hashed index");
  
  // SERVER-12222
  // printjson( t.find({a : {$gte : 3 , $lte : 3}}).explain() )
  // assert.eq( t.find({a : {$gte : 3 , $lte : 3}}).explain().cursor ,
  //		cursorname ,
  //		"not using hashed cursor");
  var explain = t.find({c: 1}).explain();
  assert(!isIxscan(explain.queryPlanner.winningPlan), "using irrelevant hashed index");
  
  // Hash index used with a $in set membership predicate.
  var explain = t.find({a: {$in: [1, 2]}}).explain();
  printjson(explain);
  assert(isIxscan(explain.queryPlanner.winningPlan), "not using hashed index");
  
  // Hash index used with a singleton $and predicate conjunction.
  var explain = t.find({$and: [{a: 1}]}).explain();
  assert(isIxscan(explain.queryPlanner.winningPlan), "not using hashed index");
  
  // Hash index used with a non singleton $and predicate conjunction.
  var explain = t.find({$and: [{a: {$in: [1, 2]}}, {a: {$gt: 1}}]}).explain();
  assert(isIxscan(explain.queryPlanner.winningPlan), "not using hashed index");
  
  // test creation of index based on hash of _id index
  var goodspec2 = {'_id': "hashed"};
  t.ensureIndex(goodspec2);
  assert.eq(t.getIndexes().length, 3, "_id index didn't get created");
  
  var newid = t.findOne()["_id"];
  assert.eq(t.find({_id: newid}).hint({_id: 1}).toArray()[0]._id,
            t.find({_id: newid}).hint(goodspec2).toArray()[0]._id,
            "using hashed index and different index returns different docs");
  
  // test creation of sparse hashed index
  var sparseindex = {b: "hashed"};
  t.ensureIndex(sparseindex, {"sparse": true});
  assert.eq(t.getIndexes().length, 4, "sparse index didn't get created");
  
  // test sparse index has smaller total items on after inserts
  for (i = 0; i < 10; i++) {
      t.insert({b: i});
  }
  var totalb = t.find().hint(sparseindex).toArray().length;
  assert.eq(totalb, 10, "sparse index has wrong total");
  
  var total = t.find().hint({"_id": 1}).toArray().length;
  var totala = t.find().hint(goodspec).toArray().length;
  assert.eq(total, totala, "non-sparse index has wrong total");
  assert.lt(totalb, totala, "sparse index should have smaller total");
  