Add #countsPerTarget method to retrieve the overall stats.

            });

        },

        /**

         * Returns number of comments for each target in the current

         * domain.  Excludes deleted comments.

         *

         * @param {Function} callback Called with the result.

         * @param {Object} callback.counts Map of targets to counts:

         *

         *     {

         *         "class__Ext__": 3,

         *         "class__Ext__method-define": 1,

         *         "class__Ext.Panel__cfg-title": 8

         *     }

         */

        countsPerTarget: function(callback) {

            var sql = [

                'SELECT',

                '    type,',

                '    cls,',

                '    member,',

                '    count(*) AS count',

                'FROM full_visible_comments',

                'WHERE domain = ?',

                'GROUP BY target_id'

            ];

            this.query(sql, [this.domain], function(rows) {

                var map = {};

                rows.forEach(function(r) {

                    var id = [r.type, r.cls, r.member].join("__");

                    map[id] = +r.count;

                });

                callback(map);

            });

        },

        query: function(sqlLines, params, callback) {

            this.db.query(sqlLines.join("\n"), params, function(err, rows) {

                if (err) throw err;

        });

    });

    it("#countPerTarget gets number of comments for each target", function(done) {

        comments.countsPerTarget(function(counts) {

            expect(counts["class__Ext.grid.column.Column__cfg-renderer"]).toEqual(20);

            done();

        });

    });

});