better test coverage

tests/test-find-by-objectid.js

@@ -0,0 +1,19 @@
+var assert = require('assert');
+var insert = require('./insert');
+
+insert([{
+	hello:'world'
+}], function(db, done) {
+	db.a.find({_id:db.ObjectId('abeabeabeabeabeabeabeabe')}, {hello:1}, function(err, docs) {
+		assert.ok(!err);
+		assert.equal(docs.length, 0);
+
+		db.a.save({_id:db.ObjectId('abeabeabeabeabeabeabeabe')}, function() {
+			db.a.find({_id:db.ObjectId('abeabeabeabeabeabeabeabe')}, {hello:1}, function(err, docs) {
+				assert.ok(!err);
+				assert.equal(docs.length, 1);
+				done();
+			});
+		});
+	});
+});

tests/test-find-limit.js

@@ -0,0 +1,13 @@
+var assert = require('assert');
+var insert = require('./insert');
+
+insert([{
+	hello:'world'
+}], function(db, done) {
+	db.a.find().limit(1, function(err, docs) {
+		assert.ok(!err);
+		assert.equal(docs.length, 1);
+		assert.equal(docs[0].hello, 'world');
+		done();
+	});
+});

tests/test-group.js

@@ -0,0 +1,29 @@
+var assert = require('assert');
+var insert = require('./insert');
+
+insert([{
+	t: 242424,
+	online: 1
+}, {
+	t: 4244,
+	online: 0
+}], function(db, done) {
+	db.a.group({
+		key: {},
+		cond: {t: {$gte: 86400}},
+		initial: {count: 0, online: 0},
+		reduce: function(doc, out) {
+			out.count++;
+			out.online += doc.online;
+		},
+		finalize: function(out) {
+			out.avgOnline = out.online / out.count;
+		}
+	}, function(err, curOnline) {
+		assert.ok(!err);
+		assert.equal(curOnline[0].count, 1);
+		assert.equal(curOnline[0].online, 1);
+		done();
+	});
+})
+