Added a helper for generating sequences.

lib/adapter_responder.js

@@ -24,16 +24,10 @@ module.exports = Mixin.create(/** @lends AdapterResponder# */ {
    * @param {String|RegExp} regex
    */
   fail: function(regex) {
-    /* jscs:disable jsDoc */
-
     if (_.isString(regex)) { regex = new RegExp(regex, 'i'); }
-    var responder = function(/*client, sql, args*/) {
+    this.custom(regex, function(/*client, sql, args*/) {
       throw new Error('FakeFail for ' + regex.toString());
-    };
-    responder.regex = regex;
-    this._responders.unshift(responder);
-
-    /* jscs:enable jsDoc */
+    });
   },
 
   /**
@@ -46,16 +40,38 @@ module.exports = Mixin.create(/** @lends AdapterResponder# */ {
    * database (built from result if not provided).
    */
   respond: function(regex, result) {
-    /* jscs:disable jsDoc */
+    var fields = arguments[2] || _(result)
+      .map(_.keys).flatten()
+      .uniq().value();
 
-    var fields = arguments[2] || _(result).map(_.keys).flatten().uniq().value();
-    var responder = function(/*client, sql, args*/) {
+    this.custom(regex, function(/*client, sql, args*/) {
       return { rows: result, fields: fields };
-    };
+    });
+  },
+
+  /**
+   * Add a fake response that returns serial ids for a regex match.
+   *
+   * @param {RegExp} regex The SQL to match.
+   * @param {Number} n The starting number for the sequence.
+   */
+  sequence: function(regex, n) {
+    this.custom(regex, function(/*client, sql, args*/) {
+      return { rows: [{ id: n++ }], fields: ['id'] };
+    });
+  },
+
+  /**
+   * Add a fake response that returns the result of a function.
+   *
+   * @param {RegExp} regex The SQL to match.
+   * @param {function(Object, String, Array): Object} fn The function to call
+   * to obtain the value.
+   */
+  custom: function(regex, fn) {
+    var responder = _.partial(fn); // copy the function
     responder.regex = regex;
     this._responders.unshift(responder);
-
-    /* jscs:enable jsDoc */
   },
 
   /**

test/adapter_tests.js

@@ -19,6 +19,17 @@ describe('fake adapter', __query(function() {
     });
   });
 
+  it('can generate sequences for queries', function() {
+    adapter.sequence(/.*/, 1);
+    return query.select('t1').then(function(result) {
+      result.should.eql({ fields: ['id'], rows: [{ id: 1 }] });
+    })
+    .then(function() { return query.select('t1'); })
+    .then(function(result) {
+      result.should.eql({ fields: ['id'], rows: [{ id: 2 }] });
+    });
+  });
+
   it('can produce failures', function() {
     adapter.fail(/.*/);
     return query.select('t1').execute()