Added query-generator test.

test/query-generator.test.js

+/* jshint multistr: true */
+var chai      = require('chai')
+  , expect    = chai.expect
+  , Support   = require(__dirname + '/support')
+  , DataTypes = require(__dirname + "/../lib/data-types")
+  , dialect   = Support.getTestDialect()
+  , _         = require('lodash')
+
+chai.Assertion.includeStack = true
+
+describe(Support.getTestDialectTeaser("QueryGenerators"), function () {
+  before(function(done) {
+    this.interface = this.sequelize.getQueryInterface()
+    done()
+  })
+
+  describe("comments", function() {
+    it("should create a comment for a column", function(done) {
+      var self = this
+        , User = this.sequelize.define('User', {
+          username: {type: DataTypes.STRING, comment: 'Some lovely info for my DBA'}
+        })
+
+      User.sync({ force: true }).success(function(){
+        var sql = ''
+        if (dialect === "mysql") {
+          sql = 'SELECT COLUMN_COMMENT as cmt FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = \'' + self.sequelize.config.database + '\' AND TABLE_NAME = \'Users\' AND COLUMN_NAME = \'username\'';
+        }
+        else if (dialect === "postgres" || dialect === "postgres-native") {
+          sql = 'SELECT com.description as cmt FROM pg_attribute a  JOIN pg_class pgc ON pgc.oid = a.attrelid \
+                  LEFT JOIN pg_index i ON (pgc.oid = i.indrelid AND i.indkey[0] = a.attnum) \
+                  LEFT JOIN pg_description com on (pgc.oid = com.objoid AND a.attnum = com.objsubid) \
+                  WHERE a.attnum > 0 AND pgc.oid = a.attrelid AND pg_table_is_visible(pgc.oid) \
+                    AND NOT a.attisdropped AND pgc.relname = \'Users\' AND a.attname = \'username\'';
+        }
+        else if (dialect === "sqlite") {
+          // sqlite doesn't support comments except for explicit comments in the file
+          expect(true).to.be.true
+          return done()
+        } else {
+          console.log('FIXME: This dialect is not supported :(');
+          expect(true).to.be.true
+          return done()
+        }
+
+        self.sequelize.query(sql, null, {raw: true}).success(function(result) {
+          expect(result[0].cmt).to.equal('Some lovely info for my DBA');
+          done()
+        })
+      })
+    })
+  })
+})